Today's Message Index:
----------------------
1. 04:51 AM - Re: Re: Capacitive fuel probe errors? (Trampas)
2. 05:34 AM - Re: routing coax in a Cessna (CardinalNSB@aol.com)
3. 05:53 AM - 2 magenetometers, Dynon (Matt Jurotich)
4. 06:31 AM - Re: 2 magenetometers, Dynon (Dan Checkoway)
5. 06:48 AM - Re: Re: routing coax in a Cessna (flyv35b)
6. 07:21 AM - Re: 2 magenetometers, Dynon (Jim Stone)
7. 07:27 AM - Re: Re: routing coax in a Cessna (Brian Lloyd)
8. 08:39 AM - Re: Re: routing coax in a Cessna (Robert L. Nuckolls, III)
9. 08:39 AM - Re: 2 magenetometers, Dynon (Robert L. Nuckolls, III)
10. 08:53 AM - Spark plug wires... (Malcolm Thomson)
11. 09:03 AM - Re: Spark plug wires... (Ed Anderson)
12. 09:24 AM - Re: Trim speed control (Jim Stone)
13. 09:27 AM - Van's Vor wingtip ant (Jim Stone)
14. 11:04 AM - Re: Spark plug wires... (Erie Patsellis)
15. 11:22 AM - Re: Spark plug wires... (Robert L. Nuckolls, III)
16. 11:23 AM - Re: Trimmers etc. (Eric M. Jones)
17. 11:35 AM - Re: Spark plug wires... (Benford2@aol.com)
18. 11:49 AM - Coax type rg-142B vs Rg-400 (Jeffrey W. Skiba)
19. 11:53 AM - FW: radio ariel placement (Steve Sampson)
20. 12:01 PM - Re: Spark plug wires... (Chad Robinson)
21. 12:06 PM - Re: Spark plug wires... (Matt Prather)
22. 12:13 PM - Re: Spark plug wires... (Matt Prather)
23. 01:11 PM - Re: Spark plug wires... (Malcolm Thomson)
24. 01:36 PM - Re: FW: radio ariel placement (Brian Lloyd)
25. 03:08 PM - plug wires... (hausding, sid)
26. 03:34 PM - Re: radio ariel placement (Jim Jewell)
27. 03:52 PM - Re: plug wires... (Malcolm Thomson)
28. 05:55 PM - Re: Spark plug wires... (Jim Oke)
29. 06:09 PM - Re: Re: Cold Cathode Fluorescent Lights (John Schroeder)
30. 06:27 PM - Re: Re: Trimmers etc. (Fiveonepw@aol.com)
31. 06:30 PM - Re: RG Batteries Where to buy online? (John Ciolino)
32. 06:31 PM - Re: Spark plug wires... (George Braly)
33. 06:33 PM - Re: FW: radio ariel placement (Fiveonepw@aol.com)
34. 07:36 PM - Re: Spark plug wires... (Ernest Christley)
35. 08:11 PM - Re: Spark plug wires... (William)
36. 08:27 PM - Avionics Cooling fans - blowers (Jeffrey W. Skiba)
37. 09:06 PM - Re: Avionics Cooling fans - blowers (Robert McCallum)
38. 09:22 PM - Re: Spark plug wires... (BobsV35B@aol.com)
39. 10:05 PM - Source for coax connectors (Gary Liming)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | RE: Capacitive fuel probe errors? |
--> AeroElectric-List message posted by: "Trampas" <tstern@nc.rr.com>
The way I get around this in my engine monitor is to do everything. That is
the Pulsar allows the user to decide what they want the instrument to do.
For example consider the fuel level problem, the Pulsar engine monitor can
be configured to show two simultaneous fuel gauges, one calibrated with
100LL and one with auto gas using the same capacitive probes.
Alternatively the Pulsar can be configured to use a submerged reference
capacitor and switch calibrations based on the reference cap. Note the
Pulsar basically has a programmable calculator built in so you could use one
calibration table and use the reference capacitor to scale the calibration
based on the dielectric constant.
Third option is to use fuel flow sensors to measure the actual fuel burned.
Note that since the Pulsar is configurable by the end user you can implement
all three solutions if you wanted. You could also have fuel gauges showing
liters, pounds and gallons simultaneous.
Heck if you really wanted you could place the reference capacitor near the
bottom of the tank and use it not only to calculate the dielectric constant
but also as a low fuel level light.
Don't look at the Pulsar as an engine monitor but rather think of it as a
data acquisition system coupled with a sun light readable color LCD and a
programmable calculator.
Regards,
Trampas
www.sterntech.com
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Winston
Ellis
Subject: Re: AeroElectric-List: RE: Capacitive fuel probe errors?
--> AeroElectric-List message posted by: Winston Ellis
<w1mdi@cox-internet.com>
"Eric M. Jones" wrote:
> Simply have another tiny reference circuit that is a capacitive fuel
sensor
> that is always submerged. The rest is simple for a rocket scientist.
The manufacturer I spoke to said he has thought of doing just that, have a
reference cap in the bottom of the tank, but figured that it would make the
whole
system too expensive. It seems like this will be necessary if these probes
are
going to work with auto fuel.
Winston Ellis
Zenith 701/uzuki
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: routing coax in a Cessna |
--> AeroElectric-List message posted by: CardinalNSB@aol.com
I am adding a gps and traffic detector (top and bottom transponder antennas)
and also replacing the coax all with RG400.
On top are the gps antenna, transponder antenna for the traffic detector, and
two comm antennas, with the comm/glideslpe whisker in the fin; on bottom is
the transponder, dme, marker beacon, and the additional transponder antenna for
the traffic detector.
Any suggestions as to routing the coax, do they interfere with each other,
does it matter? Thank you, Skip Simpson
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | 2 magenetometers, Dynon |
--> AeroElectric-List message posted by: Matt Jurotich <mjurotich@hst.nasa.gov>
I am planning to ditch the electric spinning gryos AI and DG in favor of a
second EFIS. Each would require a remote sensing magnetometer. Can I
place these side by side or one on top of the other? If they must be
separated, how far? If anybody has already done this, results? Pictures?
I have only one report on the FIX to the Dynon RFI problem. Has anyone
else installed the "dongle" and gotten rid of the interference?
Cross posted to RV and Aeroelectric lists.
Thanks in advance.
Matthew M. Jurotich
NASA/Goddard Space Flight Center
Swales contractor to the
JWST ISIM Systems Engineer
m/c : 443
e-mail mail to: <mjurotich@hst.nasa.gov>
phone : 301-286-5919
fax : 301-286-7021
JWST URL: <http://ngst1.gsfc.nasa.gov
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: 2 magenetometers, Dynon |
--> AeroElectric-List message posted by: "Dan Checkoway" <dan@rvproject.com>
> I have only one report on the FIX to the Dynon RFI problem. Has anyone
> else installed the "dongle" and gotten rid of the interference?
Last I heard, Dynon was producing the final "potted" dongle. The one I had
tested was just a free-hanging unprotected version. I just emailed Doug
Medema this morning to see where they stand on production. Will advise when
I get the final version.
)_( Dan
RV-7 N714D
http://www.rvproject.com
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: routing coax in a Cessna |
--> AeroElectric-List message posted by: "flyv35b" <flyv35b@ashcreekwireless.com>
> I am adding a gps and traffic detector (top and bottom transponder
antennas)
How are you connecting both of the antennas (transponder antenna) to the
traffic detector? Through a splitter of some sort I presume?
Cliff
----- Original Message -----
From: <CardinalNSB@aol.com>
Subject: AeroElectric-List: Re: routing coax in a Cessna
> --> AeroElectric-List message posted by: CardinalNSB@aol.com
>
> I am adding a gps and traffic detector (top and bottom transponder
antennas)
> and also replacing the coax all with RG400.
>
> On top are the gps antenna, transponder antenna for the traffic detector,
and
> two comm antennas, with the comm/glideslpe whisker in the fin; on bottom
is
> the transponder, dme, marker beacon, and the additional transponder
antenna for
> the traffic detector.
>
> Any suggestions as to routing the coax, do they interfere with each other,
> does it matter? Thank you, Skip Simpson
>
>
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: 2 magenetometers, Dynon |
--> AeroElectric-List message posted by: "Jim Stone" <jrstone@insightbb.com>
Matt,
I'm curious what Dynon had to say. Remember, they designed and built the
thing, and I feel that sort of query falls under customer service and
technical assistance. I would ask them first before asking for an educated
opinion from the list.
Jim
do not archive
----- Original Message -----
From: "Matt Jurotich" <mjurotich@hst.nasa.gov>
Subject: AeroElectric-List: 2 magenetometers, Dynon
> --> AeroElectric-List message posted by: Matt Jurotich
<mjurotich@hst.nasa.gov>
>
> I am planning to ditch the electric spinning gryos AI and DG in favor of a
> second EFIS. Each would require a remote sensing magnetometer. Can I
> place these side by side or one on top of the other? If they must be
> separated, how far? If anybody has already done this, results? Pictures?
>
> I have only one report on the FIX to the Dynon RFI problem. Has anyone
> else installed the "dongle" and gotten rid of the interference?
>
> Cross posted to RV and Aeroelectric lists.
>
> Thanks in advance.
>
>
> Matthew M. Jurotich
>
> NASA/Goddard Space Flight Center
> Swales contractor to the
> JWST ISIM Systems Engineer
>
> m/c : 443
> e-mail mail to: <mjurotich@hst.nasa.gov>
> phone : 301-286-5919
> fax : 301-286-7021
>
>
> JWST URL: <http://ngst1.gsfc.nasa.gov
>
>
Message 7
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: routing coax in a Cessna |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
CardinalNSB@aol.com wrote:
> --> AeroElectric-List message posted by: CardinalNSB@aol.com
>
> I am adding a gps and traffic detector (top and bottom transponder antennas)
> and also replacing the coax all with RG400.
I presume you mean LMR-400. Good stuff. I use it in a lot of microwave applications.
It isn't very flexible so be careful with your routing so as not to bend
it too tightly.
> On top are the gps antenna, transponder antenna for the traffic detector, and
> two comm antennas, with the comm/glideslpe whisker in the fin; on bottom is
> the transponder, dme, marker beacon, and the additional transponder antenna for
> the traffic detector.
>
> Any suggestions as to routing the coax,
Routing the coax inside the fuselage shouldn't be an issue so long as you keep
the bend radii as large as possible.
> do they interfere with each other,
> does it matter? Thank you, Skip Simpson
The DME and transponder can interfere with each other. (Actually the DME can interfere
with the transponder.) The manuals should tell you how far apart to place
the antennas for the transponder and DME. In fact, your DME probably has
a pulse supression line that goes to the transponder to squelch replies from
the transponder in reply to DME pulses. You can try installing without it but
if some DME frequencies cause the transponder reply light to come on, you need
the supression line.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 8
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: routing coax in a Cessna |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 03:27 PM 4/29/2004 +0100, you wrote:
>--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
>
>CardinalNSB@aol.com wrote:
> > --> AeroElectric-List message posted by: CardinalNSB@aol.com
> >
> > I am adding a gps and traffic detector (top and bottom transponder
> antennas)
> > and also replacing the coax all with RG400.
>
>I presume you mean LMR-400. Good stuff. I use it in a lot of microwave
>applications. It isn't very flexible so be careful with your routing so
>as not to bend it too tightly.
RG-400 is a double shielded version of RG-58 with modern
insulations and silver plated shield. LMR-400 is a different
stuff.
> > On top are the gps antenna, transponder antenna for the traffic
> detector, and
> > two comm antennas, with the comm/glideslpe whisker in the fin; on
> bottom is
> > the transponder, dme, marker beacon, and the additional transponder
> antenna for
> > the traffic detector.
> >
> > Any suggestions as to routing the coax,
>
>Routing the coax inside the fuselage shouldn't be an issue so long as you
>keep the bend radii as large as possible.
RG-400 is good down to 2" radius bends or less.
> > do they interfere with each other,
> > does it matter? Thank you, Skip Simpson
>
>The DME and transponder can interfere with each other. (Actually the DME
>can interfere with the transponder.) The manuals should tell you how far
>apart to place the antennas for the transponder and DME. In fact, your
>DME probably has a pulse supression line that goes to the transponder to
>squelch replies from the transponder in reply to DME pulses. You can try
>installing without it but if some DME frequencies cause the transponder
>reply light to come on, you need the supression line.
Coax placement is an issue of days gone by but direct
interference between these systems via signals radiated
from antennas is a BIG issue. Good advice on the suppression
line.
Bob . . .
Message 9
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: 2 magenetometers, Dynon |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 10:21 AM 4/29/2004 -0400, you wrote:
>--> AeroElectric-List message posted by: "Jim Stone" <jrstone@insightbb.com>
>
>Matt,
>I'm curious what Dynon had to say. Remember, they designed and built the
>thing, and I feel that sort of query falls under customer service and
>technical assistance. I would ask them first before asking for an educated
>opinion from the list.
Good advice on ANY product issues. One should always approach
the manufacturer for first issues like this . . . and then repeat what
they say here on the list so that others know about it!
Bob . . .
>Jim
>do not archive
>----- Original Message -----
>From: "Matt Jurotich" <mjurotich@hst.nasa.gov>
>To: <aeroelectric-list@matronics.com>; <rv-list@matronics.com>
>Subject: AeroElectric-List: 2 magenetometers, Dynon
>
>
> > --> AeroElectric-List message posted by: Matt Jurotich
><mjurotich@hst.nasa.gov>
> >
> > I am planning to ditch the electric spinning gryos AI and DG in favor of a
> > second EFIS. Each would require a remote sensing magnetometer. Can I
> > place these side by side or one on top of the other? If they must be
> > separated, how far? If anybody has already done this, results? Pictures?
> >
> > I have only one report on the FIX to the Dynon RFI problem. Has anyone
> > else installed the "dongle" and gotten rid of the interference?
> >
> > Cross posted to RV and Aeroelectric lists.
> >
> > Thanks in advance.
> >
> >
> > Matthew M. Jurotich
Message 10
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Spark plug wires... |
--> AeroElectric-List message posted by: "Malcolm Thomson" <mdthomson@attglobal.net>
I am using an automotive type engine (Falconer V12) which uses
electronic ignition and MSD high quality ignition wires. Spark plugs
are automotive 14mm. I have heard that the engine may misfire at "high
altitudes" due to the ignition spark finding a ground through the spark
plug wires or arcing to other spark plug wires.
My first question is why does a higher altitude make this show up and is
there a better (more like those plug wires used on a certified aircraft)
spark plug wire that can be used to prevent this?
Thanks
Message 11
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Spark plug wires... |
--> AeroElectric-List message posted by: "Ed Anderson" <eanderson@carolina.rr.com>
Maclom
I and a number of other rotary engine powered RVs fly with quality auto
sparkplug wires up to around 17,000 MSL and have not encountered that
problem. Perhaps we are not flying high enough.
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From: "Malcolm Thomson" <mdthomson@attglobal.net>
Subject: AeroElectric-List: Spark plug wires...
> --> AeroElectric-List message posted by: "Malcolm Thomson"
<mdthomson@attglobal.net>
>
> I am using an automotive type engine (Falconer V12) which uses
> electronic ignition and MSD high quality ignition wires. Spark plugs
> are automotive 14mm. I have heard that the engine may misfire at "high
> altitudes" due to the ignition spark finding a ground through the spark
> plug wires or arcing to other spark plug wires.
>
> My first question is why does a higher altitude make this show up and is
> there a better (more like those plug wires used on a certified aircraft)
> spark plug wire that can be used to prevent this?
>
> Thanks
>
>
Message 12
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Trim speed control |
--> AeroElectric-List message posted by: "Jim Stone" <jrstone@insightbb.com>
Good point.
Jim
----- Original Message -----
From: "Brian Lloyd" <brianl@lloyd.com>
Subject: Re: AeroElectric-List: Trim speed control
> --> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
>
> Jim Stone wrote:
>
> > Well you got me there. Perhaps a normally closed switch with an
emergency
> > position of open would solve that emergency. That way the switch on the
> > panel never gets used except for a runaway. What do you think?
>
> I think that is just something else to go wrong. You can bump it, drop
something on it, etc. I like the pull-able breaker or fuse idea myself.
>
> --
> Brian Lloyd 6501 Red Hook Plaza
> brianl@lloyd.com Suite 201
> http://www.lloyd.com St. Thomas, VI 00802
> +1.340.998.9447 (voice) +1.360.838.9669 (fax)
>
> There is a time to laud one's country and a time to protest.
> A good citizen is prepared to do either as the need arises.
>
>
Message 13
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Van's Vor wingtip ant |
--> AeroElectric-List message posted by: "Jim Stone" <jrstone@insightbb.com>
Does anyone have Van's VOR wingtip antennae installed and working? I'm wondering
if it works as good as the Bob Archer unit. It is only 25 bucks.
Thanks,
Jim
Message 14
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Spark plug wires... |
--> AeroElectric-List message posted by: Erie Patsellis <erie@shelbyvilledesign.com>
which would make sense, as the dielectric voltage of the air increases
as the density decreases.....
or at least that's what I was taught 20 years ago in college...
erie
Ed Anderson wrote:
>--> AeroElectric-List message posted by: "Ed Anderson" <eanderson@carolina.rr.com>
>
>Maclom
>
> I and a number of other rotary engine powered RVs fly with quality auto
>sparkplug wires up to around 17,000 MSL and have not encountered that
>problem. Perhaps we are not flying high enough.
>
>Ed
>
>Ed Anderson
>RV-6A N494BW Rotary Powered
>Matthews, NC
>----- Original Message -----
>From: "Malcolm Thomson" <mdthomson@attglobal.net>
>To: <aeroelectric-list@matronics.com>
>Subject: AeroElectric-List: Spark plug wires...
>
>
>
>
>>--> AeroElectric-List message posted by: "Malcolm Thomson"
>>
>>
><mdthomson@attglobal.net>
>
>
>>I am using an automotive type engine (Falconer V12) which uses
>>electronic ignition and MSD high quality ignition wires. Spark plugs
>>are automotive 14mm. I have heard that the engine may misfire at "high
>>altitudes" due to the ignition spark finding a ground through the spark
>>plug wires or arcing to other spark plug wires.
>>
>>My first question is why does a higher altitude make this show up and is
>>there a better (more like those plug wires used on a certified aircraft)
>>spark plug wire that can be used to prevent this?
>>
>>Thanks
>>
>>
>>
>>
>
>
>
>
Message 15
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Spark plug wires... |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 09:53 AM 4/29/2004 -0600, you wrote:
>--> AeroElectric-List message posted by: "Malcolm Thomson"
><mdthomson@attglobal.net>
>
>I am using an automotive type engine (Falconer V12) which uses
>electronic ignition and MSD high quality ignition wires. Spark plugs
>are automotive 14mm. I have heard that the engine may misfire at "high
>altitudes" due to the ignition spark finding a ground through the spark
>plug wires or arcing to other spark plug wires.
>
>My first question is why does a higher altitude make this show up and is
>there a better (more like those plug wires used on a certified aircraft)
>spark plug wire that can be used to prevent this?
If someone is having altitude related, high voltage problems, it's
not with wire. Dielectric strength is a function of insulation material
and thickness which does not vary with altitude. However, connections
NOT totally enclosed in insulation (like interface between wire and
some form of connector) exposes conductors to ambient pressures where
arc-overs are pressure related.
Bob . . .
-----------------------------------------
( Experience and common sense cannot be )
( replaced with policy and procedures. )
( R. L. Nuckolls III )
-----------------------------------------
Message 16
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Trimmers etc. |
--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
There has been an on-going discussion regarding Trim Speed, Trim failure
management, Dual trim controls, etc. This makes a shoe lace tied to a trim
cable spring seem like a good idea.
I too, have a MAC servo for the elevator trim (for a complete exposition of
this device see my website), and I am planning to make a Cessna-type trim
wheel in the center console. This will alleviate some of the problems.
I would like to suggest a short list of considerations:
Runaway trim:
1) If you want to keep the stock pushbuttons, they must be environmentally
sealed and top quality.
2) If you think you can pull a breaker to remedy a runaway trim....you have
more faith that I have.
Dual operation:
3) How do you KNOW there is a trim runaway???? You might only feel something
is really amiss. Or maybe you could figure it out but John Denver might not.
Dual control:
1) A center console wheel is really functional. There are many
"both-pilot-operated" controls, and that's why they are centered between the
pilots.
2) A lot of dual control schemes make for more complications.
Fail safe designs:
1) Making a trim servo that is substantially fool-proof is not impossible.
What you want is probably a "neutral-center-on-control failure" scheme. The
idea is that a working control system must update the trim servo
periodically...a "watch-dog", and tell it that everything is okay. If this
does not happen, the trim servo centers automatically. (A little explosive
bolt might do!).
2) Make redundant trim tab systems. (And I don't mean so each pilot can have
one, although this might solve the dual control problem too!)
3) Futaba servo controllers can be made to self-center if everything else
goes bonkers. These R/C guys are clever.
Trim Speed:
1) The "Cessna-wheel" handles this automatically--sort of.
2) Use the Tach output to drive a F-V+ converter. The V+ is the voltage to
the servo.
3) Use the pitot pressure line to a little pressure sensor and op amp. The
output is V+ as above
Regards,
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge MA 01550-2705
Phone (508) 764-2072
Email: emjones@charter.net
For every complex problem, there is a solution that is simple, neat, and
wrong.
- H. L. Mencken
Message 17
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Spark plug wires... |
--> AeroElectric-List message posted by: Benford2@aol.com
In a message dated 4/29/2004 9:55:08 AM Mountain Daylight Time,
mdthomson@attglobal.net writes:
>
> I am using an automotive type engine (Falconer V12) which uses
> electronic ignition and MSD high quality ignition wires. Spark plugs
> are automotive 14mm. I have heard that the engine may misfire at "high
> altitudes" due to the ignition spark finding a ground through the spark
> plug wires or arcing to other spark plug wires.
>
> My first question is why does a higher altitude make this show up and is
> there a better (more like those plug wires used on a certified aircraft)
> spark plug wire that can be used to prevent this?
>
> Thanks
>
>
I am running MSD ignition on my fire breathing V-8 Ford. MSD stuff is working
out great, the wires you are talking about are 8.5mm not 14 mm and my radios
are very quiet running their best wires. Unless you are running up in the
20,000 + msl range I doubt there will be a misfire issue.
Ben Haas N801BH
Message 18
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Coax type rg-142B vs Rg-400 |
--> AeroElectric-List message posted by: "Jeffrey W. Skiba" <jskiba@icosa.net>
I was reading over the SL30 nav - com install guide and came across a
question for the experts. It states to use RG-142B for the coax leads or a
comparable quality 50 ohm coax.
I think rg-400 is 50 ohm but what are the other differences between the two
and which is "better" and why?
Thanks
Jeff
Message 19
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | radio ariel placement |
--> AeroElectric-List message posted by: "Steve Sampson" <SSampson.SLN21@london.edu>
I asked this a few days ago but did not see ANY replies. Sorry if it is to
be too simple to be worthy of comment. Can anyone please help? Thanks,
Steve.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Steve
Sampson
Subject: AeroElectric-List: radio ariel placement
--> AeroElectric-List message posted by: "Steve Sampson"
<SSampson.SLN21@london.edu>
I would like to put my 45 bent RAMI radio antenna on the belly about its
own length from one of the gear legs which is oriented in approvimately the
same plane. (Its an RV9a.) Is this likely to present serious radio problems?
Thanks, Steve.
PS The transponder will be a similar distance from the other gear leg
pointing vertically down.
---
Incoming mail is certified Virus Free.
---
Message 20
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Spark plug wires... |
--> AeroElectric-List message posted by: Chad Robinson <crobinson@rfgonline.com>
Malcolm Thomson wrote:
> --> AeroElectric-List message posted by: "Malcolm Thomson" <mdthomson@attglobal.net>
>
> I am using an automotive type engine (Falconer V12) which uses
> electronic ignition and MSD high quality ignition wires. Spark plugs
> are automotive 14mm. I have heard that the engine may misfire at "high
> altitudes" due to the ignition spark finding a ground through the spark
> plug wires or arcing to other spark plug wires.
>
> My first question is why does a higher altitude make this show up and is
> there a better (more like those plug wires used on a certified aircraft)
> spark plug wire that can be used to prevent this?
I'm not sure I can see any reason this would be physically possible. At higher
altitudes, air is less dense. Air is a pretty good insulator already, and the
less dense it gets, the BETTER it gets (a true vacuum being a 'perfect'
insulator). Remember, electrical flow is the movement of electrons from atom
to atom. If there aren't atoms for the electrons to hop between, they can't
move. The farther apart the atoms are, the more incentive (voltage) it takes
to get them moving.
There are other things that could cause you trouble at high altitudes, though,
like managing proper leaning. I suppose I could imagine certain ways this
could cause engine trouble (like boosting too much with a turbo and triggering
detonation), but they're best left to an engine-related list. Actually, I
suppose I can think of another. If your ECU doesn't know how to handle high
altitudes (and many auto engine ECUs are designed by default for a certain
maximum altitude in their map tables - there aren't a lot of 18,000-ft
mountains you can drive up) the ECU itself could cause some misfires.
Regards,
Chad
Message 21
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Spark plug wires... |
--> AeroElectric-List message posted by: "Matt Prather" <mprather@spro.net>
Hello Malcom,
What kind of airplane are you putting the Falconer on? My airplane
is based at the Nampa airport where they build Thundermustangs.
An impressive package.
> --> AeroElectric-List message posted by: "Malcolm Thomson"
> <mdthomson@attglobal.net>
>
> I am using an automotive type engine (Falconer V12) which uses
> electronic ignition and MSD high quality ignition wires. Spark plugs
> are automotive 14mm. I have heard that the engine may misfire at "high
> altitudes" due to the ignition spark finding a ground through the spark
> plug wires or arcing to other spark plug wires.
Most ignition systems will suffer from this issue if they are used at high
enough altitude. The question is how good is the insulation on the wire
vs. how hot the spark is (and what the routing of the wires is). At
altitude,
most magneto ignitions suffer from shorting within the distributor before
shorting between wires - that's why many forced induction aircraft engines
have pressurized mags - they are usually the only ones flying high enough
to worry about it.
>
> My first question is why does a higher altitude make this show up and is
> there a better (more like those plug wires used on a certified aircraft)
> spark plug wire that can be used to prevent this?
As has been discussed on this list before, denser air (a composition of
non-conductive gasses) is a better insulator (higher dielectric breakdown
capability). As the air gets thinner, its propensity to conduct increases.
Here's a commonly published chart of dielectric strength:
Material* Dielectric strength (kV/inch)
===========================================
Vacuum ------------------- 20
Air ---------------------- 20 to 75
Porcelain ---------------- 40 to 200
Paraffin Wax ------------- 200 to 300
Transformer Oil ---------- 400
Bakelite ----------------- 300 to 550
Rubber ------------------- 450 to 700
Shellac ------------------ 900
Paper -------------------- 1250
Teflon ------------------- 1500
Glass -------------------- 2000 to 3000
Mica --------------------- 5000
You can see that Vacuum will break down at around 20kV with a 1" gap,
whereas dense air might hold up to 75kV over the same gap. This
phenomena is commonly seen in spark plug testers. A plug that works
properly at atmospheric pressure may display shorts when the gap is
exposed to pressurized air (which has even higher dielectric strength).
You may be able to rig up shielded style spark plug leads for your engine,
but
I suspect that high quality automotive wires are better in this regard
than the
60 year old technology of aircraft style wires which were design with mag
ignition that made only about 20kV on a good day. You should be able to get
data from the wire manufacturers.
Regards,
Matt-
N34RD
Message 22
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Spark plug wires... |
--> AeroElectric-List message posted by: "Matt Prather" <mprather@spro.net>
Hello Bob,
I wonder about this... I was thinking that the total dielectric strength
resisting
arcing between wires is the combined dielectric strength of the insulators
present. It seems that OEMs usually make an effort to physically seperate
ignition leads, and my impression was that this reduced the chances of cross
fire. This suggests to me that the design depends to some extent on the
dielectric properties of the air surrounding the wires. I suppose that
the common
spark wire insulators may have such a vastly larger dielectric strength
than air or
vacuum that wire spacing may be required for chafe resistance or some other
mechanical issue.
> If someone is having altitude related, high voltage problems, it's not
> with wire. Dielectric strength is a function of insulation material
> and thickness which does not vary with altitude. However, connections
> NOT totally enclosed in insulation (like interface between wire and
> some form of connector) exposes conductors to ambient pressures where
> arc-overs are pressure related.
>
> Bob . . .
>
Regards,
Matt-
N34RD
Message 23
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Spark plug wires... |
--> AeroElectric-List message posted by: "Malcolm Thomson" <mdthomson@attglobal.net>
Yes, it's an almost finished Thunder Mustang. I have been building it
for the last 5 years but now it is getting close.
M.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Matt
Prather
Subject: Re: AeroElectric-List: Spark plug wires...
--> AeroElectric-List message posted by: "Matt Prather"
--> <mprather@spro.net>
Hello Malcom,
What kind of airplane are you putting the Falconer on? My airplane is
based at the Nampa airport where they build Thundermustangs. An
impressive package.
> --> AeroElectric-List message posted by: "Malcolm Thomson"
> <mdthomson@attglobal.net>
>
> I am using an automotive type engine (Falconer V12) which uses
> electronic ignition and MSD high quality ignition wires. Spark plugs
> are automotive 14mm. I have heard that the engine may misfire at
> "high altitudes" due to the ignition spark finding a ground through
> the spark plug wires or arcing to other spark plug wires.
Most ignition systems will suffer from this issue if they are used at
high
enough altitude. The question is how good is the insulation on the
wire
vs. how hot the spark is (and what the routing of the wires is). At
altitude, most magneto ignitions suffer from shorting within the
distributor before shorting between wires - that's why many forced
induction aircraft engines have pressurized mags - they are usually the
only ones flying high enough to worry about it.
>
> My first question is why does a higher altitude make this show up and
> is there a better (more like those plug wires used on a certified
> aircraft) spark plug wire that can be used to prevent this?
As has been discussed on this list before, denser air (a composition of
non-conductive gasses) is a better insulator (higher dielectric
breakdown capability). As the air gets thinner, its propensity to
conduct increases.
Here's a commonly published chart of dielectric strength:
Material* Dielectric strength (kV/inch)
===========================================
Vacuum ------------------- 20
Air ---------------------- 20 to 75
Porcelain ---------------- 40 to 200
Paraffin Wax ------------- 200 to 300
Transformer Oil ---------- 400
Bakelite ----------------- 300 to 550
Rubber ------------------- 450 to 700
Shellac ------------------ 900
Paper -------------------- 1250
Teflon ------------------- 1500
Glass -------------------- 2000 to 3000
Mica --------------------- 5000
You can see that Vacuum will break down at around 20kV with a 1" gap,
whereas dense air might hold up to 75kV over the same gap. This
phenomena is commonly seen in spark plug testers. A plug that works
properly at atmospheric pressure may display shorts when the gap is
exposed to pressurized air (which has even higher dielectric strength).
You may be able to rig up shielded style spark plug leads for your
engine, but I suspect that high quality automotive wires are better in
this regard than the 60 year old technology of aircraft style wires
which were design with mag ignition that made only about 20kV on a good
day. You should be able to get data from the wire manufacturers.
Regards,
Matt-
N34RD
==
direct advertising on the Matronics Forums.
==
==
==
Message 24
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: radio ariel placement |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
Steve Sampson wrote:
> I would like to put my 45 bent RAMI radio antenna on the belly about its
> own length from one of the gear legs which is oriented in approvimately the
> same plane. (Its an RV9a.) Is this likely to present serious radio problems?
No, that should work OK. You may get some shading off to the side from the gear
legs but coverage fore/aft should be good.
> PS The transponder will be a similar distance from the other gear leg
> pointing vertically down.
You are more likely to have a problem with this. The gear leg fairings on my RV-4
did noticably shade my xpdr antenna. Best to get that as much in the clear
as possible.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 25
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> AeroElectric-List message posted by: "hausding, sid" <sidh@charter.net>
What kind of plane is the V12 being mounted in? Got some pics?
Sid
------------------
>I am using an automotive type engine (Falconer V12) which uses
>electronic ignition and MSD high quality ignition wires. Spark plugs
>are automotive 14mm. I have heard that the engine may misfire at "high
>altitudes" due to the ignition spark finding a ground through the spark
>plug wires or arcing to other spark plug wires.
Bob . . .
-----------------------------------------
( Experience and common sense cannot be )
( replaced with policy and procedures. )
( R. L. Nuckolls III )
-----------------------------------------
Message 26
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: radio ariel placement |
--> AeroElectric-List message posted by: "Jim Jewell" <jjewell@telus.net>
Hi Steve,
I have seen many mounted the same as you describe. My radio guy says mine
will be fine mounted the same.
Jim in Kelowna
----- Original Message -----
From: "Steve Sampson" <SSampson.SLN21@london.edu>
Subject: FW: AeroElectric-List: radio ariel placement
> --> AeroElectric-List message posted by: "Steve Sampson"
<SSampson.SLN21@london.edu>
>
> I asked this a few days ago but did not see ANY replies. Sorry if it is to
> be too simple to be worthy of comment. Can anyone please help? Thanks,
> Steve.
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Steve
> Sampson
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: radio ariel placement
>
>
> --> AeroElectric-List message posted by: "Steve Sampson"
> <SSampson.SLN21@london.edu>
>
> I would like to put my 45 bent RAMI radio antenna on the belly about its
> own length from one of the gear legs which is oriented in approvimately
the
> same plane. (Its an RV9a.) Is this likely to present serious radio
problems?
>
> Thanks, Steve.
>
> PS The transponder will be a similar distance from the other gear leg
> pointing vertically down.
>
> ---
> Incoming mail is certified Virus Free.
>
> ---
>
>
Message 27
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> AeroElectric-List message posted by: "Malcolm Thomson" <mdthomson@attglobal.net>
A Thunder Mustang. See www.thundermustang.com
M.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
hausding, sid
Subject: AeroElectric-List: plug wires...
--> AeroElectric-List message posted by: "hausding, sid"
--> <sidh@charter.net>
What kind of plane is the V12 being mounted in? Got some pics? Sid
------------------
>I am using an automotive type engine (Falconer V12) which uses
>electronic ignition and MSD high quality ignition wires. Spark plugs
>are automotive 14mm. I have heard that the engine may misfire at "high
>altitudes" due to the ignition spark finding a ground through the spark
>plug wires or arcing to other spark plug wires.
Bob . . .
-----------------------------------------
( Experience and common sense cannot be )
( replaced with policy and procedures. )
( R. L. Nuckolls III )
-----------------------------------------
==
direct advertising on the Matronics Forums.
==
==
==
Message 28
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Spark plug wires... |
--> AeroElectric-List message posted by: Jim Oke <wjoke@shaw.ca>
I recall reading a Corky Meyer story some years ago where he described a
practical example of this. He and his fellow Grumman test-pilots were
test-flying Hellcats (?) to higher altitudes (27,000 - 28,00 ft or so) and
had a series of "interesting" engine failures which recovered at lower
altitudes. Problem - what to do?
After a brief discussion with his opposite number at Chance-Vought flying
Corsairs (the competition!) the answer turned out to be pressurized ignition
harnesses. These were procured with some difficulty (higher priority users -
there was a war on...) and solved the problem.
Really big P&W radial engines & mid to high 20,000 ft altitudes. No quite
homebuilt territory really.
Jim Oke
Wpg., MB
----- Original Message -----
From: "Malcolm Thomson" <mdthomson@attglobal.net>
Subject: AeroElectric-List: Spark plug wires...
> --> AeroElectric-List message posted by: "Malcolm Thomson"
<mdthomson@attglobal.net>
>
> I am using an automotive type engine (Falconer V12) which uses
> electronic ignition and MSD high quality ignition wires. Spark plugs
> are automotive 14mm. I have heard that the engine may misfire at "high
> altitudes" due to the ignition spark finding a ground through the spark
> plug wires or arcing to other spark plug wires.
>
> My first question is why does a higher altitude make this show up and is
> there a better (more like those plug wires used on a certified aircraft)
> spark plug wire that can be used to prevent this?
>
> Thanks
>
>
Message 29
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Cold Cathode Fluorescent Lights |
--> AeroElectric-List message posted by: John Schroeder <jschroeder@perigee.net>
Jim -
What are you using for the shell for your maplight?
Are you taking an original and modifying it for a LED or 2 or 3?
Is it a gooseneck?
Thanks,
John
> LED sources are getting very efficient, and for my map light aimed at
> the lap, I will be > using Luxeon Stars, which run $12 to $14, and can
> be had in white, red, and other colors, with and without an epoxy lens.
> With the lens, the unit is 1" square, and draws one watt. This works
> out to 350 ma at about 3 volts, so you need a 30 ohm resistor if you
> want to run only one from the 14 volt battery. This also works well
> with a dimmer.
>
> Jim Foerster
Message 30
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Trimmers etc. |
--> AeroElectric-List message posted by: Fiveonepw@aol.com
In a message dated 04/29/2004 12:23:57 PM Central Standard Time,
emjones@charter.net writes:
Dual operation:
3) How do you KNOW there is a trim runaway???? You might only feel something
is really amiss. Or maybe you could figure it out but John Denver might not.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
FWIW- if an uncommanded out-of-trim condition manifests itself (gee, why am I
pointed at the ground?!) or any other odd situation grabs my attention while
life is good, my laser guided finger finds the Master switch pronto- damn,
didn't need at those distractions anyway-
After allowing adrenaline to subside & get used to that warm feeling down
under, assess situation, realize what went down, gingerly turn on the E-bus feed
(trim/autopilot/flaps are on Main bus, no?) and have a "reasonably"
comfortable completion of flight...
From The PossumWorks in TN
Mark Phillips - Aeroelectric -6A N51PW, 67 hrs & still grinnin' like a mule
eatin' briars!!
Message 31
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: RG Batteries Where to buy online? |
--> AeroElectric-List message posted by: John Ciolino <jbc2000@earthlink.net>
try ebay.Prices are surprisingly low.
John Ciolino
Jim Stone wrote:
>--> AeroElectric-List message posted by: "Jim Stone" <jrstone@insightbb.com>
>
>I used Sunn battery in Jacksonville Fl. Great price and shipping on Odyssey
>680. http://www.sunnbattery.com/catalog.html
>Jim
>
>----- Original Message -----
>From: <ALWAYSPDG@aol.com>
>To: <aeroelectric-list@matronics.com>
>Subject: AeroElectric-List: RG Batteries Where to buy online?
>
>
>
>
>>--> AeroElectric-List message posted by: ALWAYSPDG@aol.com
>>
>>I would like to ask the group where you might recommend to purchase a RG
>>battery online. I am looking to replace an existing PowerSonic PS-12180
>>
>>
>NB
>
>
>>battery.
>>
>>
>>Thanks, Mike
>>
>>
>>
>>
>
>
>
>
Message 32
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Spark plug wires... |
--> AeroElectric-List message posted by: "George Braly" <gwbraly@gami.com>
>> If someone is having altitude related, high voltage problems, it's
not with wire. Dielectric strength is a function of insulation
material
and thickness which does not vary with altitude. However, connections
NOT totally enclosed in insulation (like interface between wire and
some form of connector) exposes conductors to ambient pressures where
arc-overs are pressure related.
Bob . . .<<
Bob,
I think you are right - - if you assume the harness is in good condition
to begin with.
But if the harness has faults or cracks or pinholes - - then the
likelihood that these faults will turn into misfires to ground or
structure or other ignition wires will get progressively more likely
with altitude.
We just changed out a HARNESS only today. If completely solved the
problem with a turbocharged engine. We had already changed the plugs
and the mags. Both of those efforts helped only a little.
The engine ran fine up to about 13000'. Above that, even with the new
mags and plugs - - it was ugly.
New harness - - today - - and it ran like a top to 20,000'.
Regards George
Message 33
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: radio ariel placement |
--> AeroElectric-List message posted by: Fiveonepw@aol.com
In a message dated 04/29/2004 12:54:26 PM Central Standard Time,
SSampson.SLN21@london.edu writes:
I would like to put my 45 bent RAMI radio antenna on the belly about its
own length from one of the gear legs which is oriented in approvimately the
same plane. (Its an RV9a.) Is this likely to present serious radio problems?
>>>>>>>>>>>>>>>>>>>
My 20$ special comm antenna is one of those cheesy bent-whip jobs from ACS
and it works beautifully with my Microair 760 mounted as you describe- I've
easily conversed with aircraft over 70 miles distant. My XPNDR is INOP ATT(at
this time) so I can't comment- but I located it just aft of the cowling on the
side opposite the comm antenna, FWIW.......
yeehaw! Mark -6A
Message 34
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Spark plug wires... |
--> AeroElectric-List message posted by: Ernest Christley <echristley@nc.rr.com>
George Braly wrote:
> --> AeroElectric-List message posted by: "George Braly" <gwbraly@gami.com>
>
>
>>> If someone is having altitude related, high voltage problems, it's
>
> not with wire. Dielectric strength is a function of insulation
> material
> and thickness which does not vary with altitude. However, connections
> NOT totally enclosed in insulation (like interface between wire and
> some form of connector) exposes conductors to ambient pressures where
> arc-overs are pressure related.
>
> Bob . . .<<
>
> Bob,
>
> I think you are right - - if you assume the harness is in good condition
> to begin with.
>
> But if the harness has faults or cracks or pinholes - - then the
> likelihood that these faults will turn into misfires to ground or
> structure or other ignition wires will get progressively more likely
> with altitude.
>
Actual experience is hard to argue with. If changing out the harness
fixed the problem, then there was a problem with the harness. The
question we are all having now is, "Why?"
All reason says that the insulation increases with altitude, so
obviously our reasoning is leaving something out.
--
http://www.ernest.isa-geek.org/
"Ignorance is mankinds normal state,
alleviated by information and experience."
Veeduber
Message 35
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Spark plug wires... |
--> AeroElectric-List message posted by: "William" <wschertz@ispwest.com>
> Actual experience is hard to argue with. If changing out the harness
> fixed the problem, then there was a problem with the harness. The
> question we are all having now is, "Why?"
>
> All reason says that the insulation increases with altitude, so
> obviously our reasoning is leaving something out.
>
------------------------------------------------
Actually, insulation does not increase with altitude.
Bill schertz
Message 36
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Avionics Cooling fans - blowers |
--> AeroElectric-List message posted by: "Jeffrey W. Skiba" <jskiba@icosa.net>
Okay, I am about to give up trying to figure this out,
Why are FAA TSO bla bla bla avionics cooling fans so special?? I know they
have all that paper work to drive the price up but other than that,
I mean they are brushless, Made of plastic and run from dc voltage either 12
or 24 volts?
So other than the TSO paper work what else makes them so expensive??
Is there something special there doing to contain EMI - RFI ??? I mean
computer cooling fans are dirt cheap, and able to cool electronics parts in
computers, why can't they be used for Experimental aircraft ?
Can anybody shed some light on this one ??
Thanks in advance
Jeff.
Message 37
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Avionics Cooling fans - blowers |
--> AeroElectric-List message posted by: Robert McCallum <robert.mccallum2@sympatico.ca>
>--> AeroElectric-List message posted by: "Jeffrey W. Skiba" <jskiba@icosa.net>
>
>Okay, I am about to give up trying to figure this out,
>
>Why are FAA TSO bla bla bla avionics cooling fans so special??
>
They're not.
>I know they
>have all that paper work to drive the price up but other than that,
>
>I mean they are brushless, Made of plastic and run from dc voltage either 12
>or 24 volts?
>
Correct.
>
>So other than the TSO paper work what else makes them so expensive??
>
Nothing, other than the fact that those with certified aircraft must use
them by regulation and therefore the seller can get what the market will
bear.
>
>Is there something special there doing to contain EMI - RFI ???
>
No.
>I mean
>computer cooling fans are dirt cheap, and able to cool electronics parts in
>computers, why can't they be used for Experimental aircraft ?
>
They can. You can use anything you want in an experimental. That's why
it's an experimental.
Why would you suppose you can't?
>
>Can anybody shed some light on this one ??
>
You are required to use TSO'd parts only in certified aircraft, you can
use anything you deem suitable for the task at hand in an experimental.
>
>Thanks in advance
>Jeff.
>
Bob McC
>
>
Message 38
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Spark plug wires... |
--> AeroElectric-List message posted by: BobsV35B@aol.com
In a message dated 4/29/04 8:32:01 PM Central Daylight Time, gwbraly@gami.com
writes:
We just changed out a HARNESS only today. If completely solved the
problem with a turbocharged engine. We had already changed the plugs
and the mags. Both of those efforts helped only a little.
The engine ran fine up to about 13000'. Above that, even with the new
mags and plugs - - it was ugly.
New harness - - today - - and it ran like a top to 20,000'.
Good Evening George,
Just anecdotal info, but, back in the olden days when I was flying Cessna
195s quite a bit, I often found that the engine would get rough above ten or
twelve thousand feet, yet smooth out nicely once I got to lower altitudes.
Replacing the wires in the ignition harness generally solved the problem.
Most of the 195s of those days, even new ones straight from the factory, were
equipped with W.W.II surplus engines. Evidently, ignition wire stock improved
drastically during the war and replacing early W.W.II wire with early fifties
wire made a big difference. Modern stuff oughta do a LOT better!
Do Not Archive.
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Airpark LL22
Downers Grove, IL 60516
630 985-8502
Message 39
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Source for coax connectors |
--> AeroElectric-List message posted by: Gary Liming <gary@liming.org>
Does anyone know of a good source for those right angle coax connectors
that go on the rear of the frames of a KT76A or a ICOM A200? They include
a cap and a ring clip, and are intended to have the coax shield soldered to
the connector. I bought a used KT76A and the one that is on the rack needs
replacing.
Thanks,
Gary Liming
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|