Today's Message Index:
----------------------
1. 10:15 AM - Re: Re: Kind of off topic. Speed sensor needed. (Peter Pengilly)
2. 12:21 PM - Warm-up Problem (David & Elaine Lamphere)
3. 03:13 PM - Feedback while transmitting (Michael Hilderbrand)
4. 03:26 PM - Re: Vertical Power? (marcausman)
5. 03:35 PM - Re: isispower (marcausman)
6. 06:07 PM - Fw: Feedback while transmitting (Michael Hilderbrand)
7. 06:22 PM - Re: Feedback while transmitting (Gus Schlegel)
8. 07:34 PM - RV-8 - Instrument Panel Power Coat & Silkscreen... (Matt Dralle)
9. 07:57 PM - Re: speed sensor (Jim Baker)
10. 08:35 PM - Re: RV-8 - Instrument Panel Power Coat & Silkscreen... (David)
11. 10:39 PM - Re: Battery Equalizers (D Fritz)
12. 11:10 PM - Re: Battery Equalizers (Bruce Gray)
Message 1
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| Subject: | Re: Kind of off topic. Speed sensor needed. |
That reminds me! I saw this system used in a rowing race (over several
miles), 2 cameras at the start, and 2 at the finish (in case of failure
- 400 boats competing), all cameras filmed a 'master clock' to
synchronise their own clocks before the start. Does require some effort
after the speed runs, but only cost is 2 digital camcorders.
Peter
user9253 wrote:
>
> Sam,
> How about using two clocks and two cameras? Synchronize two very accurate clocks
or stop watches and locate them at opposite ends of the runway. Take fast
pictures of the plane (including the clock) as it passes starting and ending
points. Review the pictures and note the times on the clocks and subtract.
> Joe
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=277622#277622
>
>
>
Message 2
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Here are the symptoms/conditions:
1. King KX125, Plane Power 60a alternator, Lycoming O-320-D2A, PS
Engineering 1000II intercom, Lightspeed 20XLc headsets.
2. After engine startup initially while the battery is being re-charged, if
I press the PTT button to transmit to unicom, I'll hear a very loud
hi-pitched whistle in my headset (side-tone)- my guess is it's around 8Khz.
It doesn't appear that transmitting gets through.
3. The radio recieves very clearly during this period - say listening to
AWOS for example.
4. With the intercom off, it does the same thing.
5. After the battery is recharged, and from then on in the flight (including
re-starts after re-fuel) the radio transmits and recieves clearly.
6. There is a 2.2uF at the positive output lead of the alternator to ground.
There is a noise filter between the main bus and avionics buss.
7. A single point multi-tab ground is used.
Any ideas what to look at next??
Dave
Message 3
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| Subject: | Feedback while transmitting |
I am getting a loud feedback noise in my headset when-I press the PTT.-
It only seems to happen-70% of the time - having the engine-running, o
r not, is of no difference.--Today in-the hangar I pressed the PTT an
d could hear the feedback coming out of the speakers-of my-jam-box radi
o several feet-away! The radio on the jam-box was on but the volume turne
d all the way down. When I unplugged it I could no longer hear the noise in
the-jam-box, but it was VERY present in my headphones. Of course, this i
n a new installation in my airplane - flown the plane 2 times now.- Not b
eing able to her yourself talk is frustrating! Oh.. yeah, the receiving end
-ALWAYS hears me "loud & clear."- =0A=0AAnyone have a good FIRST place
to start looking to fix this problem. It seems- like it might be a simple
fix.... a ground maybe? Inadequate antenna? - =0A=0AThanks! =0A-Michae
l Hilderbrand=0ADerby, Kansas=0AHttp://www.kansasflying.com
Message 4
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| Subject: | Re: Vertical Power? |
As with any new technology, there needs to be education to answer questions. I'd
be more than happy to answer any questions you have about failure modes, weight,
feature comparison between various products, etc. Just call! Our number is
505 715 6172. Or email marc 'at' verticalpower.com
--------
Marc Ausman
http://www.verticalpower.com "Move up to a modern electrical system"
RV-7 IO-390 Flying
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=277788#277788
Message 5
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Well, the turn signals, horn, and high beams are great new features for airplanes.
Be the first on your block...
Seriously though, this product is designed for automobiles. Vertical Power is designed
for aircraft and therefore it's working in its intended environment.
--------
Marc Ausman
http://www.verticalpower.com "Move up to a modern electrical system"
RV-7 IO-390 Flying
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=277789#277789
Message 6
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| Subject: | Fw: Feedback while transmitting |
did not seem to post-the first time... please scroll down.=0A-Michael H
ilderbrand=0ADerby, Kansas=0AHttp://www.kansasflying.com =0A=0A=0A=0A-----
Forwarded Message ----=0AFrom: Michael Hilderbrand <m_hilderbrand@sbcglobal
.net>=0ATo: Aeroelectric-list@matronics.com=0ASent: Wed, December 16, 2009
5:06:37 PM=0ASubject: Feedback while transmitting=0A=0A=0AI am getting a lo
ud feedback noise in my headset when-I press the PTT.- It only seems to
happen-70% of the time - having the engine-running, or not, is of no d
ifference.--Today in-the hangar I pressed the PTT and could hear the
feedback coming out of the speakers-of my-jam-box radio several feet-
away! The radio on the jam-box was on but the volume turned all the way dow
n. When I unplugged it I could no longer hear the noise in the-jam-box, b
ut it was VERY present in my headphones. Of course, this in a new installat
ion in my airplane - flown the plane 2 times now.- Not being able to her
yourself talk is frustrating! Oh.. yeah, the receiving end-ALWAYS hears m
e "loud & clear."- =0A=0AAnyone have a good FIRST place to start looking
to fix this problem. It seems- like it might be a simple fix.... a ground
maybe? Inadequate antenna? - =0A=0AThanks! =0A-Michael Hilderbrand=0AD
erby, Kansas=0AHttp://www.kansasflying.com
Message 7
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| Subject: | Re: Feedback while transmitting |
Michael Hilderbrand wrote:
> I am getting a loud feedback noise in my headset when I press the
> PTT. It only seems to happen 70% of the time - having the
> engine running, or not, is of no difference. Today in the hangar I
> pressed the PTT and could hear the feedback coming out of the
> speakers of my jam-box radio several feet away! The radio on the
> jam-box was on but the volume turned all the way down. When I
> unplugged it I could no longer hear the noise in the jam-box, but it
> was VERY present in my headphones. Of course, this in a new
> installation in my airplane - flown the plane 2 times now. Not being
> able to her yourself talk is frustrating! Oh.. yeah, the receiving
> end ALWAYS hears me "loud & clear."
>
> Anyone have a good FIRST place to start looking to fix this problem.
> It seems like it might be a simple fix.... a ground maybe? Inadequate
> antenna?
>
> Thanks!
>
> Michael Hilderbrand
> Derby, Kansas
> Http://www.kansasflying.com
> *
> *
I had the same problem, intermittent feedback - until I started moving
my headset cables around and voila! At a certain position in relation to
the antenna cable it started squealing. I rerouted my antenna cable and
the problem went away.
Gus Sonex N7770R
Message 8
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| Subject: | RV-8 - Instrument Panel Power Coat & Silkscreen... |
Listers,
I got the instrument panel back from power coat and silkscreen today and I just
couldn't wait to stick the instruments in to see what it looks like!
Sweet!!
I can hardly wait to get it mounted and powered back up!
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Blog
Final Assembly
Message 9
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| Subject: | Re: speed sensor |
A bit of research/thought on using a simple low power accutate frequency tr
ansmitter - and measuring the Doppler might give you the accuracy and easy
mounting you seek.
--- On Wed, 12/16/09, AeroElectric-List Digest Server <aeroelectric-list@ma
tronics.com> wrote:
From: AeroElectric-List Digest Server <aeroelectric-list@matronics.com>
Subject: AeroElectric-List Digest: 14 Msgs - 12/15/09
>
*
========================
---Online Versions of Today's List Digest Archive
========================
Today's complete AeroElectric-List Digest can also be found in either of th
e
two Web Links listed below.- The .html file includes the Digest formatted
in HTML for viewing with a web browser and features Hyperlinked Indexes
and Message Navigation.- The .txt file includes the plain ASCII version
of the AeroElectric-List Digest and can be viewed with a generic text edito
r
such as Notepad or with a web browser.
HTML Version:
- - http://www.matronics.com/digest/digestview.php?Style=82701&View
=html&Chapter 09-12-15&Archive=AeroElectric
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- - - - -----------------------------------------------------
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- - - - - - - - - - - - ---AeroElectric-List
Digest Archive
- - - - - - - - - - - - - - - - - - -
---
- - - - - - - - - ---Total Messages Posted Tue 12/1
5/09: 14
- - - - -----------------------------------------------------
--------
Today's Message Index:
----------------------
- ---1. 05:49 AM - Re: LOOKING FOR RIGHT ANGLE BNC CONNECTOR- (Ge
off Heap)
- ---2. 06:11 AM - Re: Re: Vertical Power?- (Gilles Thesee)
- ---3. 07:03 AM - Re: Kind of off topic. Speed sensor needed.- (
Robert Reed)
- ---4. 07:13 AM - xm weather connector- (jtortho@aol.com)
- ---5. 07:24 AM - Re: LOOKING FOR RIGHT ANGLE BNC CONNECTOR- (us
er9253)
- ---6. 07:56 AM - Re: Kind of off topic. Speed sensor needed.- (
Robert L. Nuckolls, III)
- ---7. 08:05 AM - Re: Kind of off topic. Speed sensor needed.- (
David Nelson)
- ---8. 08:34 AM - Re: Kind of off topic. Speed sensor needed.- (
user9253)
- ---9. 09:29 AM - Z-19- (Jay Hyde)
- - 10. 10:24 AM - Re: Z-19- (Allen Fulmer)
- - 11. 10:57 AM - Re: Kind of off topic. Speed sensor needed.- (ray)
- - 12. 05:42 PM - Re: Z-19- (Robert L. Nuckolls, III)
- - 13. 06:10 PM - Re: Re: Power Opti-Miser- (Robert L. Nuckolls, III
)
- - 14. 10:28 PM - Re: Battery Equalizers- (Robert L. Nuckolls, III)
________________________________- Message 1- __________________________
___________
Time: 05:49:22 AM PST US
Subject: AeroElectric-List: Re: LOOKING FOR RIGHT ANGLE BNC CONNECTOR
From: "Geoff Heap" <stol10@comcast.net>
Sorry. I wasn't complaining about the hiss. I was complaining that, that wa
s all
i got. I live under Philadelphia approach. Commercial craft at a couple tho
usand
feet most of the day. I thought I would be picking up some of that. I'll
borrow a hand held and test it with that on Saturday.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=277599#277599
________________________________- Message 2- __________________________
___________
Time: 06:11:14 AM PST US
From: Gilles Thesee <Gilles.Thesee@ac-grenoble.fr>
Subject: Re: AeroElectric-List: Re: Vertical Power?
Matt Dralle a crit :
>
> Here is a link to my builder's log, specifically regarding the avionics i
nstallation.
Lots of pictures and dialog describing the system.- Let me know if you
have any questions.
>
> http://www.mattsrv8.com/users/category.php?user=MattsRV8&project=638&
category=2971
>
>---
Matt,
Thanks.
Best regards,
--
Gilles
http://contrails.free.fr
________________________________- Message 3- __________________________
___________
Time: 07:03:31 AM PST US
From: Robert Reed <robertr237@att.net>
Subject: Re: AeroElectric-List: Kind of off topic. Speed sensor needed.
If the laser were ground mounted the only thing required on the plane might
be a couple of identifiable stripes of paint on the underside of the aircr
aft.- It would not require a high powered laser and shouldn't pose any da
nger to the pilot since the directionality of the beam would be vertical an
d not directed at the pilot.=0A=0AIf the laser were mounted inside the
plan
e it-wouldn't require more than a dime sized opening that could be covere
d with glass.- The laser beam would be setup to oscillate back and forth
with a ground based sensor to detect the beam as the plane crossed the dete
ction points.- The size of current low power lasers are so small that the
re should be no problem with either weight or drag.- =0A=0ABob=0A=0
A=0A
=0A________________________________=0AFrom: Sam Hoskins <sam.hoskins@gm
ail.
com>=0ATo: aeroelectric-list <aeroelectric-list@matronics.com>=0ASent:
Mon,
December 14, 2009 8:01:49 PM=0ASubject: Re: AeroElectric-List: Kind of o
ff
topic. Speed sensor needed.=0A=0ARadar guns were used with the AirVent
ure
Cup racers several years ago and I think they didn't work too well.- The
SARL guys are looking for some precise timing.=0A=0AThey currently are
usin
g sighting rods and triangulation, but it is leaving too much judgment to t
he timing person.- I think that would also apply to David's suggestion.
=0A=0AThey want to capture a full runway length of time, to have a more
rep
resentative view of true speed, rather than just a snapshot that a radar gu
n might provide.=0A=0AAn aircraft mounted lasar system might to it, but
how
.where would you mount it to many different kinds of aircraft, and in such
a way that it would not create drag?=0A=0AThese are the problems the SA
RL g
uys are trying to work around.=0A=0AThanks for the suggestions.=0A=
0ASam=0A
=0A=0AOn Mon, Dec 14, 2009 at 6:16 PM, Robert D. Taylor <FLYDAD57@neo.r
r.co
m> wrote:=0A=0AWould a radar gun, like the cops use, work??=0A>-=0A
>=0A>-
---- Original Message ----- =0A>>From: Sam Hoskins =0A>>To: Aerolectric
Lis
t =0A>>Sent: Monday, December 14, 2009 4:01 PM=0A>>Subject: AeroElectri
c-Li
st: Kind of off topic. Speed sensor needed.=0A>>=0A>>Aeroelectric liste
rs,
=0A>>=0A>>We're looking for a bright idea.- Preferably an inexpensive o
ne
.=0A>>=0A>>The Sport Air Racing League, http://www.sportairrace.org/ is
try
ing to develop an accurate and reliable way to time the speed of- an airc
raft zooming down a runway, at 50 feet or so.- They are looking for some
kind of trigger that will start the clock at one end, and stop it at the fa
r end.=0A>>=0A>>We don't really want to erect pylons to fly through to
brea
k a beam, that would be unwieldy. Some of the guys have looked at airborne
systems, such as GPS tracking, but it's not accurate enough.=0A>>=0A>>T
he S
ARL group is having a hard time coming up with something.- Anybody have a
ny thoughts how we might accomplish this?=0A>>=0A>>Thanks for any ideas
.=0A
>>=0A>>Sam Hoskins=0A>>Race 22!=0A>>=0A>>=0A>>=0A>>=0A>>href
="http://www.
aeroelectric.com">www.aeroelectric.com=0A>>=0A>>href="http://www.buil
ders
books.com">www.buildersbooks.com=0A>>href="http://www.homebuilthelp.com
">
www.homebuilthelp.com=0A>>href="http://www.matronics.com/contribution">
ht
tp://www.matronics.com/chref="http://www.matronics.com/Navigator?AeroElec
tric-List">http://www.matronics.com/Navigator?AeroElectric-List=0A>>href
"http://forums.matronics.com">http://forums.matronics.com=0A>>=0A>>=0
A>=0A>
=0A>_blank">www.aeroelectric.com=0A>=0A>.com" target="_blank">www.b
uilder
sbooks.com=0A>="_blank">www.homebuilthelp.com=0A>_blank">http://www.m
atro
nics.com/contribution=0A>ist" target="_blank">http://www.matronics.com/
Na
vigator?AeroElectric-List=0A>tp://forums.matronics.com=0A>=0A>=0A
=0A=0A=0A_
-=======================
===========
________________________________- Message 4- __________________________
___________
Time: 07:13:17 AM PST US
Subject: AeroElectric-List: xm weather connector
From: jtortho@aol.com
I have the xmweather receover, geneeration 1
this small plastic , crimped on conncetor failed at the entrance to the pl
ug.---( No stress relief I might add.)- would anybody know a part n
umber
so the whole 40 buck antenna does not need To be replaced.
http://www.anywheremap.com/detail.aspx?ID=154
The link shows the picture.- I paged through mouser but didn't see anythi
n
g
________________________________- Message 5- __________________________
___________
Time: 07:24:56 AM PST US
Subject: AeroElectric-List: Re: LOOKING FOR RIGHT ANGLE BNC CONNECTOR
From: "user9253" <fran4sew@banyanol.com>
Geoff Heap,
Have you tried a portable antenna?- Even a 22" wire will work.- Just do
not transmit.
If you can not get the hiss to go away with the squelch adjustment, there
is another squelch control on top of the radio accessible through a hole hi
dden
under round aluminum foil.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=277613#277613
________________________________- Message 6- __________________________
___________
Time: 07:56:39 AM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: Kind of off topic. Speed sensor needed.
On 15 Dec 2009, at 4:46 AM, Robert L. Nuckolls, III wrote:
---Yes, photo cells looking straight up though a tube of 2 - 4"
---and length adjusted so that subtended angle of view is sufficientl
y
---small that the "shadow" of any part of the aircraft blocks the
---skylight. There are some self-calibrating level sensor circuits
---that will adjust for slow variability in sky light levels.
E: This would work well - even if the light sensor wasn't in a tube,
calibrated correctly, the change from direct sunlight to shadow
should be enough to trigger a timing device of some description.
- - You need to constrain the view angle . . .preferably
- - without the use of optics. Long tubes seem the simplest
- - approach.
E: I would suggest two or three sensors in a line across the runway.
Then use the second or third sensor that is triggered so that you
know it's the wing that's causing the shadow both times, and not the
wing on the first end, and the spinner on the second (which would
skew results).
- - That would be useful . . . depending on how "loose"
- - the rules are for alignment with the runway ceneterline,
- - an array of senors of any number could be used.
E: Even a very simple microprocessor would be able to do the timing
accurately enough, and could display the result on an LCD screen
without too much effort.
- - Sure, the jellybean PIC products offer one set of
- - solutions.
E: There is one downside to this, if you're keen on using either end
of a runway, I guess you're looking for about 1km between sensors.
That's a lot of wire to wind up at the end of each competition! There
may be some simple radio interfaces that could be substituted...?
- - Ten years ago, I helped some RC racers craft a timing system
- - that required communication over a many acres of event
- - venue. Off the shelf, 433 MHz transmiter and receiver
- - modules provided links. Controlling atency and jitter in
- - detecting event-edges would be a critical design goal.
- - Assuming 300 mph (440 f/s) over 5000 feet of runway
- - (11.3 seconds) a .1% accuracy in timing would call for
- - control of variability to less than 10 milliseconds.
- - If shorter runs are anticipated, the number gets tighter.
- - +/-1 millisecond would probably be a practical design goal.
- - Sam. Define "accurate". What are the design goals for
- - the reduction of uncertainty?
- - Bob . . .
________________________________- Message 7- __________________________
___________
Time: 08:05:46 AM PST US
From: David Nelson <david.nelson@pobox.com>
Subject: Re: AeroElectric-List: Kind of off topic. Speed sensor needed.
Hi Sam,
Are you wanting something that displays/announces the avg speed in near rea
l-time
(ie after the plane passes the end of the runway) or this something that is
announced at the end of show?
-----/\/elson
On Mon, 14 Dec 2009, Sam Hoskins wrote:
> Aeroelectric listers,
>
> We're looking for a bright idea.- Preferably an inexpensive one.
>
> The Sport Air Racing League, http://www.sportairrace.org/ is trying to
> develop an accurate and reliable way to time the speed of- an aircraft
> zooming down a runway, at 50 feet or so.- They are looking for some kin
d of
> trigger that will start the clock at one end, and stop it at the far end.
>
> We don't really want to erect pylons to fly through to break a beam, that
> would be unwieldy. Some of the guys have looked at airborne systems, such
as
> GPS tracking, but it's not accurate enough.
>
> The SARL group is having a hard time coming up with something.- Anybody
have
> any thoughts how we might accomplish this?
>
> Thanks for any ideas.
>
> Sam Hoskins
> Race 22!
>
________________________________- Message 8- __________________________
___________
Time: 08:34:36 AM PST US
Subject: AeroElectric-List: Re: Kind of off topic. Speed sensor needed.
From: "user9253" <fran4sew@banyanol.com>
Sam,
How about using two clocks and two cameras?- Synchronize two very accurat
e clocks
or stop watches and locate them at opposite ends of the runway.- Take fas
t
pictures of the plane (including the clock) as it passes starting and endin
g points.
Review the pictures and note the times on the clocks and subtract.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=277622#277622
________________________________- Message 9- __________________________
___________
Time: 09:29:42 AM PST US
From: "Jay Hyde" <jay@horriblehyde.com>
Subject: AeroElectric-List: Z-19
Hello Bob,
I am using the Z-19 system for a dual battery, single alternator
application.- In the system the Engine Battery has OFF/ON/AUTO settings a
nd
I see that this battery will switch in when an undervoltage is detected on
the Main Power Distribution Bus, when in AUTO mode.- If one operates it i
n
AUTO mode all the time how does it ever get charged?- The obvious answer
seems to be to operate the ENG BAT switch in the ON position all the time,
but this makes the AUTO mode redundant.
An additional question is, can both batteries be safely charged via one
alternator?
Thanks
Jay
________________________________- Message 10- _________________________
___________
Time: 10:24:27 AM PST US
From: "Allen Fulmer" <afulmer@charter.net>
Subject: RE: AeroElectric-List: Z-19
Jay,
As I understand the drawing and operation of low voltage warning devices,
the Engine Battery contactor will OPEN upon low voltage if switch is in
Auto.- Idea is to save the Engine Battery for powering the electrically
dependent engine.
Allen Fulmer
RV7 wiring
Eggenfellner Subaru E6 powered
N808AF reserved
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Jay Hyde
Sent: Tuesday, December 15, 2009 11:25 AM
Subject: AeroElectric-List: Z-19
Hello Bob,
I am using the Z-19 system for a dual battery, single alternator
application.- In the system the Engine Battery has OFF/ON/AUTO settings a
nd
I see that this battery will switch in when an undervoltage is detected on
the Main Power Distribution Bus, when in AUTO mode.- If one operates it i
n
AUTO mode all the time how does it ever get charged?- The obvious answer
seems to be to operate the ENG BAT switch in the ON position all the time,
but this makes the AUTO mode redundant.
An additional question is, can both batteries be safely charged via one
alternator?
Thanks
Jay
________________________________- Message 11- _________________________
___________
Time: 10:57:35 AM PST US
From: ray <raymondj@frontiernet.net>
Subject: Re: AeroElectric-List: Kind of off topic. Speed sensor needed.
The NASA system could be turned upside down with the sweeping laser
fixed and the retroreflective tape on the underside of the aircraft.
Someone suggested the laser from a grocery store scanner as a painting
laser.- The retroreflective tape is available from SAR equipment supplier
s.
NASA system link:
http://searchandrescue.gsfc.nasa.gov/techdevelopment/l_sar.html
Just my thoughts.
Raymond Julian
Kettle River, MN
do not archive
Robert Reed wrote:
> If the laser were ground mounted the only thing required on the plane
> might be a couple of identifiable stripes of paint on the underside of
> the aircraft.- It would not require a high powered laser and shouldn't
> pose any danger to the pilot since the directionality of the beam would
> be vertical and not directed at the pilot.
>-
> If the laser were mounted inside the plane it wouldn't require more than
> a dime sized opening that could be covered with glass.- The laser beam
> would be setup to oscillate back and forth with a ground based sensor to
> detect the beam as the plane crossed the detection points.- The size of
> current low power lasers are so small that there should be no problem
> with either weight or drag.
>
> Bob
>
> ------------------------------------------------------------------------
> *From:* Sam Hoskins <sam.hoskins@gmail.com>
> *To:* aeroelectric-list <aeroelectric-list@matronics.com>
> *Sent:* Mon, December 14, 2009 8:01:49 PM
> *Subject:* Re: AeroElectric-List: Kind of off topic. Speed sensor needed.
>
> Radar guns were used with the AirVenture Cup racers several years ago
> and I think they didn't work too well.- The SARL guys are looking for
> some precise timing.
>
> They currently are using sighting rods and triangulation, but it is
> leaving too much judgment to the timing person.- I think that would als
o
> apply to David's suggestion.
>
> They want to capture a full runway length of time, to have a more
> representative view of true speed, rather than just a snapshot that a
> radar gun might provide.
>
> An aircraft mounted lasar system might to it, but how.where would you
> mount it to many different kinds of aircraft, and in such a way that it
> would not create drag?
>
> These are the problems the SARL guys are trying to work around.
>
> Thanks for the suggestions.
>
> Sam
>
> On Mon, Dec 14, 2009 at 6:16 PM, Robert D. Taylor <FLYDAD57@neo.rr.com
> <mailto:FLYDAD57@neo.rr.com>> wrote:
>
>- ---Would a radar gun, like the cops use, work??
>- - -
>- - -
>
>- - - -------- Original Message -----
>- - - ---*From:* Sam Hoskins <mailto:sam.hoskins@gmail.com>
>- - - ---*To:* Aerolectric List <mailto:aeroelectric-list@matr
onics.com>
>- - - ---*Sent:* Monday, December 14, 2009 4:01 PM
>- - - ---*Subject:* AeroElectric-List: Kind of off topic. Spee
d sensor
>- - - ---needed.
>
>- - - ---Aeroelectric listers,
>
>- - - ---We're looking for a bright idea.- Preferably an ine
xpensive one.
>
>- - - ---The Sport Air Racing League, http://www.sportairrace.
org/ is
>- - - ---trying to develop an accurate and reliable way to tim
e the speed
>- - - ---of- an aircraft zooming down a runway, at 50 feet o
r so.- They
>- - - ---are looking for some kind of trigger that will start
the clock
>- - - ---at one end, and stop it at the far end.
>
>- - - ---We don't really want to erect pylons to fly through t
o break a
>- - - ---beam, that would be unwieldy. Some of the guys have l
ooked at
>- - - ---airborne systems, such as GPS tracking, but it's not
accurate
>- - - ---enough.
>
>- - - ---The SARL group is having a hard time coming up with s
omething.
>- - - ---Anybody have any thoughts how we might accomplish thi
s?
>
>- - - ---Thanks for any ideas.
>
>- - - ---Sam Hoskins
>- - - ---Race 22!
>
>
>- - - ---*
>
>- - - ---href="http://www.aeroelectric.com">www.aeroelectric
.com <http://www.aeroelectric.com/>
>- - - ---href="http://www.buildersbooks.com">www.buildersboo
ks.com
>- - - ---<http://www.buildersbooks.com/>
>- - - ---href="http://www.homebuilthelp.com">www.homebuilthe
lp.com
>- - - ---<http://www.homebuilthelp.com/>
>- - - ---href="http://www.matronics.com/contribution">http:/
/www.matronics.com/chref="http://www.matronics.com/Navigator?AeroElectric
-List">http://www.matronics.com/Navigator?AeroElectric-List
>- - - ---href="http://forums.matronics.com">http://forums.ma
tronics.com
>- - - ---<http://forums.matronics.com/> *
>
>- ---*
>
>- ---_blank">www.aeroelectric.com
>- ---.com" target="_blank">www.buildersbooks.com
>- ---="_blank">www.homebuilthelp.com
>- ---_blank">http://www.matronics.com/contribution ist"
>- ---target="_blank">http://www.matronics.com/Navigator?AeroElec
tric-List
>- ---tp://forums.matronics.com *
>
>
> *
>- AeroElectric- <http://www.aeroelectric.com/>wwomebuilthelp.com/" tar
get=_blank rel=nofollow>www.homebuilthelp.com <http://www.buildersbooks
.com/>href="http://www.matronics.com/contribution" target=_blank rel=
nofollef="http://www.matronics.com/Navigator?AeroElectric-List" target=
_blank rel=nofollow>http://www.matronics.com/Navigator?AeroElectric-List
> ======
>
> *
>
> *
>
>
> *
________________________________- Message 12- _________________________
___________
Time: 05:42:49 PM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: RE: AeroElectric-List: Z-19
At 12:21 PM 12/15/2009, you wrote:
>Jay,
>
>As I understand the drawing and operation of low voltage warning
>devices, the Engine Battery contactor will OPEN upon low voltage if
>switch is in Auto.- Idea is to save the Engine Battery for powering
>the electrically dependent engine.
>
>Allen Fulmer
>RV7 wiring
>Eggenfellner Subaru E6 powered
>N808AF reserved
>
>From: owner-aeroelectric-list-server@matronics.com
>[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Jay Hyd
e
>Sent: Tuesday, December 15, 2009 11:25 AM
>To: aeroelectric-list@matronics.com
>Subject: AeroElectric-List: Z-19
>
>Hello Bob,
>
>I am using the Z-19 system for a dual battery, single alternator
>application.- In the system the Engine Battery has OFF/ON/AUTO
>settings and I see that this battery will switch in when an
>undervoltage is detected on the Main Power Distribution Bus, when in
>AUTO mode.- If one operates it in AUTO mode all the time how does it
>ever get charged?- The obvious answer seems to be to operate the ENG
>BAT switch in the ON position all the time, but this makes the AUTO
>mode redundant.
- ---Allen is right. The LVABMM works like this:
http://www.aeroelectric.com/articles/lvwarn/LVWarn-ABMM.pdf
- ---The design goal for such devices is to automatically
- ---disconnect the auxiliary battery during such times that
- ---the alternator is not producing enough output to maintain
- ---the battery.
>An additional question is, can both batteries be safely charged via
>one alternator?
- - You can charge as many batteries as you like.
http://aeroelectric.com/articles/Batteries/Multiple_Battery_Myths_A.pdf
- - - - Bob . . .
- - - - - - - - - - ////
- - - - - - - - ---(o o)
- - ===========o00o=(_)=o00o=====
==
- - < Go ahead, make my day . . .--->
- - < show me where I'm wrong.- - - >
- - ======================
=========
________________________________- Message 13- _________________________
___________
Time: 06:10:15 PM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: Re: Power Opti-Miser
At 11:30 AM 12/14/2009, you wrote:
>My house is not connected to the power grid, which makes me both a
>power generator and a power consumer.- If we look at this issue from
>that perspective, things change.
---<snip>
>My conclusion is that both sides of this camp might be at least
>partially correct.- Since residential power meters measure real
>watts, the residential consumer isn't penalized for the extra power
>the utility has to generate to run bad power factor appliances.
>However, the utility has to generate the extra electricity, even
>though they aren't getting paid for it (which is already built into
>the rate structure).
---The utility doesn't have to generate any extra watts. It only has
---to choose wire sizes that carry an artificially high current that
---doesn't participate in the running of devices with poor p.f.
>---But if consumers could do something to improve the power factor
> of their appliances, it would reduce the amount of electricity
> produced, reducing the unfavorable environmental consequences of
> making electricity.- That would be good for everyone (assuming the
> environmental effects of making the correction devices resulted in
> a net gain, of course).
- - The "goodness" comes only from the fact that the same work
- - can be done over smaller wires with less heating of the
- - wires. A significant savings when your transmission lines
- - are measured in miles instead of feet and transformers are
- - in 100's of KVAR instead of 2 KVAR.
>
>I have no opinion as to whether the devices under discussion
>actually reduce apparent watts.- It may well be that the most recent
>appliances include better internal power factor correction.- I know
>that the last batch of compact fluorescent bulbs I bought seem to
>have very good power factor.
- - Yes. And the folks who do switchmode power supplies
- - for computers and other electronics have been prodded
- - by dozens of articles for how p.f. can be improved for
- - over 20 years.
- - See chapter 11 in Volume 2 of the basic electronics
- - document below . . .
http://www.allaboutcircuits.com/vol_2/index.html
- - If your AC power generation devices are pseudo sine
- - wave (finely stepped square wave) then the output
- - power has more harmonic content than the stuff
- - coming out of the wall. This puts a whole new
- - twist on the problem of optimizing power factor.
- - Have you measured the aggregate power factor for
- - household loads on your system? It may well be that
- - the losses are so small that doing anything about
- - them is economically impractical. When talking about
- - small losses, keep in mind that your house wiring
- - is not zero ohms material. Depending on how long
- - the runs are, you may find that copper losses
- - are already significant and only slightly aggravated
- - by the effects of p.f.
- - Lord Kelvin reminded us often that without access
- - to the real numbers, our knowledge is of a meager
- - kind.
- - Your situation cries out for a long term study
- - of aggregate quality for your total household load.
- - A true RMS voltmeter, ammeter and power-factor meter
- - recording to a hard drive over a long period of time
- - would give you a basis for doing more detailed
- - studies followed up by useful changes to your
- - hardware.
- - - - Bob . . .
- - - - - - - - - - ////
- - - - - - - - ---(o o)
- - ===========o00o=(_)=o00o=====
==
- - < Go ahead, make my day . . .--->
- - < show me where I'm wrong.- - - >
- - ======================
=========
________________________________- Message 14- _________________________
___________
Time: 10:28:11 PM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: AeroElectric-List: Re: Battery Equalizers
At 10:12 AM 12/14/2009, you wrote:
Thanks Bob, in your response, you indicated a lack of familiarity
with battery equalizers and their functioning:
"I'd not encountered this style of "equalizer" before . . .- A study
of it's ratings suggests that the device contains a switchmode power
supply designed for charging 12v batteries from a 28v source."
Does anyone else on the list have any experience with these
units?- The advertising and claims suggest they're designed to extend
the lives of batteries wired in series by shuttling power between the
two batteries (bi-directionally) to ensure they always have the same
voltage.- Folks use these extensively in electric vehicles and for
maintaining long strings of batteries for storing energy derived from
solar power in stand-alone systems.- Anyone with some experience to
share with the list?
---The term "battery equalizer" is a really broad brush
---with which to draw a schematic or write a description
---of how it functions.
---The folks doing development work on Li-Ion aircraft
---batteries have already described a host of "electronic
---enhancements" to make sure that each one of the relatively
---small bundles of energetic chemistry are not mistreated to
---destruction . . . or worse yet, catastrophic failure.
---This is a worry for the electrically enhanced vehicle
---business too.
---Equalization COULD be nothing more than precision
---shunt regulators that prevent voltage in any single
---cell from rising above some not-to-exceed levels.
---It COULD be an array of such devices individually
---commanded from some smart device like a micro-controller.
---The "equalizer" we were discussing seems to be a single
---precision power supply designed to simply offset the
---effects of loading the lower half of a two battery
---string. In this case, each string has twelve cells
---divided into two sections . . . equalization philosophy
---is therefor coarser.
---The ideal "equalizer" for a pair of six-cell batteries
---array might be a pair of switch-mode chargers feeding
---each battery independently . . . each capable of
---sourcing the highest anticipated load on each battery.
---I'm not trying to be obtuse but until one identifies
---and understands exactly how any particular "equalizer"
---is designed to function, and matches the knowledge
---with design goals for the system, sharing of experiences
---may not be all that useful.
---Exactly how would you like to use two 12v batteries
---in a 28v system?
- - - - Bob . . .
- - - - - - - - - - ////
- - - - - - - - ---(o o)
- - ===========o00o=(_)=o00o=====
==
- - < Go ahead, make my day . . .--->
- - < show me where I'm wrong.- - - >
- - ======================
=========
le, List Admin.
=0A=0A=0A
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| Subject: | Re: Battery Equalizers |
Bob,
The planned use for the battery equalizer is to allow the charge state of t
he two batteries in a 24V system to equalize after one battery is used (via
the center tap) to run the 12V hydraulic pump.- My thought is that the b
attery will easily supply the 20A load for 30 seconds or so to required to
raise the gear, after which the equalizer will act to direct energy to it i
n order to bring its charge state up to equal that of the other battery.-
The particular unit I've chosen is called PowerCheq and appears to be desi
gned for just such an application.- It's produced by a company called Pow
er Designers, here's a link to the manual for the unit:-
-
http://www.evsource.com/datasheets/powercheq/powercheq_operations_manual.pd
f
-
and here's a link to a white paper on its design and testing:
-
http://www.fleetcareequipment.com/files/phatfile/PowerCheqPaper_MotivePower
.pdf
-
I'm not a Double-E, so I welcome comment from you and others out there rega
rding the usefulness of such a beast.
-
Dan=0A=0A=0A
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| Subject: | Battery Equalizers |
I've come into this thread on the back end, but why not just change the
hydraulic powerpac to 24V?
Bruce
www.Glasair.org
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of D
Fritz
Sent: Thursday, December 17, 2009 1:36 AM
Subject: Re: AeroElectric-List: Battery Equalizers
Bob,
The planned use for the battery equalizer is to allow the charge state
of the two batteries in a 24V system to equalize after one battery is
used (via the center tap) to run the 12V hydraulic pump. My thought is
that the battery will easily supply the 20A load for 30 seconds or so to
required to raise the gear, after which the equalizer will act to direct
energy to it in order to bring its charge state up to equal that of the
other battery. The particular unit I've chosen is called PowerCheq and
appears to be designed for just such an application. It's produced by a
company called Power Designers, here's a link to the manual for the
unit:
http://www.evsource.com/datasheets/powercheq/powercheq_operations_manual
.pdf
and here's a link to a white paper on its design and testing:
http://www.fleetcareequipment.com/files/phatfile/PowerCheqPaper_MotivePo
wer.pdf
I'm not a Double-E, so I welcome comment from you and others out there
regarding the usefulness of such a beast.
Dan
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