Today's Message Index:
----------------------
1. 05:45 AM - Re: Re: Power Opti-Miser (Ken)
2. 07:39 AM - Re: Re: LOOKING FOR RIGHT ANGLE BNC CONNECTOR (Chris Stone)
3. 07:56 AM - Re: LOOKING FOR RIGHT ANGLE BNC CONNECTOR (Geoff Heap)
4. 08:55 AM - Battery Equalizers (was: Vertical Power?) (D Fritz)
5. 09:44 AM - Re: Power Opti-Miser (Dennis Johnson)
6. 09:57 AM - Re: Re: Vertical Power? (Matt Dralle)
7. 11:06 AM - Re: LOOKING FOR RIGHT ANGLE BNC CONNECTOR (George, Neal E Capt USAF ACC 505 TRS/DOJ)
8. 01:55 PM - Kind of off topic. Speed sensor needed. (Sam Hoskins)
9. 02:48 PM - Re: Kind of off topic. Speed sensor needed. (David LLoyd)
10. 03:25 PM - Re: Kind of off topic. Speed sensor needed. (ROGER & JEAN CURTIS)
11. 03:36 PM - Re: Kind of off topic. Speed sensor needed. (Robert Reed)
12. 04:19 PM - Re: Kind of off topic. Speed sensor needed. (Robert D. Taylor)
13. 06:05 PM - Re: Kind of off topic. Speed sensor needed. (Sam Hoskins)
14. 06:45 PM - Re: Re: LOOKING FOR RIGHT ANGLE BNC CONNECTOR (Robert L. Nuckolls, III)
15. 06:45 PM - Re: Kind of off topic. Speed sensor needed. (William Slaughter)
16. 06:48 PM - Re: Kind of off topic. Speed sensor needed. (Robert L. Nuckolls, III)
17. 07:22 PM - Re: Kind of off topic. Speed sensor needed. (Robert D. Taylor)
18. 08:25 PM - Re: Kind of off topic. Speed sensor needed. (David)
19. 10:11 PM - Re: Kind of off topic. Speed sensor needed. (Etienne Phillips)
Message 1
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| Subject: | Re: Power Opti-Miser |
If a NOLA type controller was cheap enough, I think it would give a
return on investment (saved I squared * R) on some air conditioner
compressors. The load and current draw of some of these compressors
varies significantly (at least 25%) with outside temperature and the
motor is sized to handle the worst case situation. In air conditioners
any wasted motor heat is paid for at a premium in that you have to
provide additional cooling (use more power) to get rid of that heat.
I'm thinking of piston type compressors where the motors run at the same
speed regardless of load which means they are loafing along much of the
time.
Of course even better would be modern compressors capable of running at
two speeds and which also give better humidity control and more constant
supply temps as well. I can't think of any residential use other than
air conditioners and heat pumps where I would even bother to test one of
these "energy saving" devices.
Ken
Robert L. Nuckolls, III wrote:
> <nuckolls.bob@aeroelectric.com>
>
> At 03:25 PM 12/12/2009, you wrote:
>>
>> Perhaps I'm dated but most capacitor start motors only used the
>> capacitor to get a phase change for starting. The capacitor did not do
>> anything for running PF correction IIRC. Have things changed?
>
> No . . . digging around in the gray matter seems to
> dredge up some things I used to teach about induction
> motors at Great Lakes. The capacitor(s) on a motor
> are for starting (the BIG guy) paired with the
> occasional second, smaller device for running.
> My central air conditioners and shop air compressor
> are fitted with a pair of Start/Run capacitors.
>
> And you're right, those capacitors are selected for
> optimized rotation of a magnetic field in the stator
> when only single-phase power is available. They're in
> series with one or more windings and NOT for PF correction.
> P.F. correction needs to be in parallel with the main
> winding.
>
> So, depending on how high the resistive losses in
> the main winding, there could be some significant
> degradation of power factor. But the motor guys
> are as sensitive to temperature rise due to I(squared)*R
> as are the guys who transformers and other wiring.
> They'll do what economically practical to minimize
> said losses.
>
> I think one of the articles that were cited over
> the past few days suggested that average power
> factor for a home was .90 . . . so it would be
> difficult to realize much savings in I(squared)*R
> R losses when the majority of said losses are
> spread over ALL the building's distribution system.
>
>
> Bob . . .
>
Message 2
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| Subject: | Re: LOOKING FOR RIGHT ANGLE BNC CONNECTOR |
For RF connectors of all types try...
90 degree
http://www.aaarfproducts.com/index.asp?PageAction=VIEWPROD&ProdID=43
RF connectors
http://www.pasternack.com/
Cable and connectors
http://www.fccable.com/
Chris Stone
RV-8
>Subject: AeroElectric-List: Re: LOOKING FOR RIGHT ANGLE BNC CONNECTOR
>
>
>I found a 90deg replacement it's a little expensive at $25 ea. Nice thing there
is no soldering required. I also found a few sites that have it in stock.
>
>http://www.keenzo.com/showproduct.asp?ID=1274376
>
>http://www.texomajet.com/ProductDisplay.aspx?CatID=148&SubCatID=869&CatName=RF%20CONNECTORS&SubCatName=ALL%20TRAY%20MOUNT
>
>
>http://www.allaeroparts.com/ProductDisplay.aspx?CatID=148&SubCatID=869&CatName=RF%20CONNECTORS&SubCatName=ALL%20TRAY%20MOUNT
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=277253#277253
>
>
>Attachments:
>
>http://forums.matronics.com//files/dba_600percent20brochure_381.pdf
>
>
Message 3
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| Subject: | Re: LOOKING FOR RIGHT ANGLE BNC CONNECTOR |
My 10 cents is that the 9-30-10 is not an adaptor. The item in the A200 installation
picture attached is a 9-30-10 from lanepilot.com. $25.00 with shipping.
(or $52 from ICOM)
This part was a supplied item with the A200. They stopped when they came out with
the A210.
Now a question.
I have soldered the connection in two places as shown.
When I solder the antenna connector on the other end. Should I also solder the
braid to the connector body or should I separate the braid and ground it to the
airframe or should I trim it back and not solder it anywhere. (I soldered braid
to connector body)
Reason I'm asking is that all I'm getting from the speaker is a hissing sound.
To keep it simple I started by hooking up the speaker only. nothing else. I suspect
my coaxial wire (RG58 A/U) because when I pull the coax out of the A200
the noise is unchanged..Geoff
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=277493#277493
Attachments:
http://forums.matronics.com//files/9_30_10_solder_618.jpg
Message 4
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| Subject: | Battery Equalizers (was: Vertical Power?) |
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 a
dvertising and claims suggest they're designed to extend the lives of batte
ries wired in series by shuttling power between the two batteries (bi-direc
tionally) to ensure they always have the same voltage.- Folks use these e
xtensively in electric vehicles and for maintaining long strings of batteri
es for storing energy derived from solar power in stand-alone systems.- A
nyone with some experience to share with the list?
-
Dan=0A=0A=0A
Message 5
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| Subject: | Re: Power Opti-Miser |
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.
Let's say I install some compact fluorescent lights to save electricity.
Assume I have the misfortune to select ones with a bad power factor.
If I were connected to the power grid, my electrical meter would measure
real watts, which in this case is 70 watts for all the lights I
installed. That's a big savings over the tungsten filament lights I
removed. So far, so good.
But since I'm my own power producer, I have to make enough extra
electricity to accommodate the lousy power factor. In this case, let's
say the power factor is 0.7. That means I have to make 100 watts of
apparent power to run my 70 watts of compact fluorescent lights. Still
a savings over the tungsten bulbs, but not as much as expected.
I have measured the actual amperage taken out of my battery bank to
power compact fluorescent lights and these numbers are in the ballpark.
I want to warn everyone that I have no background in electrical
engineering but have had a lifelong tinkerer's interest in it and
studied everything I could find when designing and installing my
off-grid solar home. So I could be way off here, and hope I'm corrected
if I'm wrong about any of this.
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. Therefore, the
residential consumer shouldn't expect to see any savings on the utility
bill.
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). 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).
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.
Dennis
Long-time Home Power magazine subscriber http://www.homepower.com/home/
Wikipedia power factor reference: http://en.wikipedia.org/wiki/AC_power
Message 6
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| Subject: | Re: Vertical Power? |
At 03:42 PM 12/13/2009 Sunday, you wrote:
>
>Matt Dralle a crit :
>>
>>Rethink the over-kill, Don! I've got three GRT HX screens and the VP-200...
See attached.
>>
>>
>Matt,
>
>Awesome indeed.
>I took the liberty of forwarding your picture to a group of pilots buddies and
got lots of questions in return.
>Would you mind giving more details about your setup ?
>
>Thanks,
>Best regards,
>--
>Gilles
>http://contrails.free.fr
Thanks!
Here is a link to my builder's log, specifically regarding the avionics installation.
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 Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com
Final Assembly
Message 7
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| Subject: | Re: LOOKING FOR RIGHT ANGLE BNC CONNECTOR |
Geoff -
The insulating and jacketing materials used in RG-58 are vulnerable to
the temps encountered in soldering operations. RG-400 is much better
suited to this application.
When using coax to feed an antenna, the shield must be electrically
connected at both ends. On antennas that employ a BNC-type connector,
the connector shells provide the circuit path from the radio case ground
to the aircraft skin, which serves as the antenna ground plane. Whether
the braid is soldered or clamped to the shell with some sort of threaded
or crimped fastener is determined by the particular connector design.
It is quite possible that the heat of soldering was sufficient to melt
the foam insulation separating the center conductor and the braided
shield. If the two get together, things don't work so good, and
transmitting could damage the radio's RF output circuit.
Finally, if you haven't checked/adjusted the radio's squelch setting, it
may be set low enough that the hiss you're hearing is normal white
noise. Tighten the squelch and see if the hiss goes away.
Neal
N8ZG
-----Original Message-----
<stol10@comcast.net>
Now a question.
I have soldered the connection in two places as shown.
When I solder the antenna connector on the other end. Should I also
solder the braid to the connector body or should I separate the braid
and ground it to the airframe or should I trim it back and not solder it
anywhere. (I soldered braid to connector body)
Reason I'm asking is that all I'm getting from the speaker is a hissing
sound. To keep it simple I started by hooking up the speaker only.
nothing else. I suspect my coaxial wire (RG58 A/U) because when I pull
the coax out of the A200 the noise is
unchanged=C3=A2=82=AC=C2=C3=A2=82=AC=C2..Geoff
Message 8
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| Subject: | Kind of off topic. Speed sensor needed. |
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 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 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 9
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| Subject: | Re: Kind of off topic. Speed sensor needed. |
Hi Sam,
One of the old fashion systems might be considered.
Mounting a gun sight device on a tripod and having some young person,
with good tracking reflexes man it. Maybe a skeet and trap gunner. He
sights on the aircraft nose and as it comes over the finish line, the
swinging and tracking of the gun sight rides over a micro switch with a
very fast make or break. This swt. action starts and/or stops a clock.
If the operator has trouble tracking the nose of the aircraft, then all
bets are off of course.
You are sure right about gps. All but, maybe some military designs do
not update fast enough. You would probably need one that updates and
calculates at a minimum of 1 millisec. or faster.
David
----- Original Message -----
From: Sam Hoskins
To: Aerolectric List
Sent: Monday, December 14, 2009 1:01 PM
Subject: AeroElectric-List: Kind of off topic. Speed sensor needed.
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 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 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 10
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| Subject: | Kind of off topic. Speed sensor needed. |
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 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 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!
Sam,
Have you considered a hand held radar gun, similar to the ones police
departments use for traffic speed??
Roger
Message 11
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| Subject: | Re: Kind of off topic. Speed sensor needed. |
You didn't indicate rather the speed sensor could be mounted in the plane o
r needed to be on the ground.- If it could be mounted on the plane I woul
d say that a low powered laser similar to those use in a grocery check out
could be used with ground based reflectors.- I-can't see any problem wi
th using-the same-system with a ground based-unit since the lights ar
e of brief duration and low power.- They are widely used by police and hi
ghway patrols.- The accuracy would be great.=0A=0A=0A=0A=0A______________
__________________=0AFrom: Sam Hoskins <sam.hoskins@gmail.com>=0ATo: Aerole
ctric List <aeroelectric-list@matronics.com>=0ASent: Mon, December 14, 2009
3:01:20 PM=0ASubject: AeroElectric-List: Kind of off topic. Speed sensor n
eeded.=0A=0AAeroelectric listers,=0A=0AWe're looking for a bright idea.-
Preferably an inexpensive one.=0A=0AThe 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 or so.- T
hey are looking for some kind of trigger that will start the clock at one e
nd, and stop it at the far end.=0A=0AWe don't really want to erect pylons t
o fly through to break a beam, that would be unwieldy. Some of the guys hav
e looked at airborne systems, such as GPS tracking, but it's not accurate e
nough.=0A=0AThe SARL group is having a hard time coming up with something.
- Anybody have any thoughts how we might accomplish this?=0A=0AThanks for
=======
Message 12
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| Subject: | Re: Kind of off topic. Speed sensor needed. |
Would a radar gun, like the cops use, work??
----- Original Message -----
From: Sam Hoskins
To: Aerolectric List
Sent: Monday, December 14, 2009 4:01 PM
Subject: AeroElectric-List: Kind of off topic. Speed sensor needed.
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 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 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 13
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| Subject: | Re: 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 also 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>wrote:
> Would a radar gun, like the cops use, work??
>
>
> ----- Original Message -----
> *From:* Sam Hoskins <sam.hoskins@gmail.com>
> *To:* Aerolectric List <aeroelectric-list@matronics.com>
> *Sent:* Monday, December 14, 2009 4:01 PM
> *Subject:* AeroElectric-List: Kind of off topic. Speed sensor needed.
>
> 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 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 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!
>
>
> *
>
> href="http://www.aeroelectric.com">www.aeroelectric.com
>
> href="http://www.buildersbooks.com">www.buildersbooks.com
> href="http://www.homebuilthelp.com">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.matronics.com
> *
>
> *
>
>
> *
>
>
Message 14
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| Subject: | Re: LOOKING FOR RIGHT ANGLE BNC CONNECTOR |
At 09:55 AM 12/14/2009, you wrote:
>
>My 10 cents is that the 9-30-10 is not an adaptor.
Correct. It's a specialized connector.
>Now a question.
> I have soldered the connection in two places as shown.
>When I solder the antenna connector on the other end.
Why are you using a soldered connector on this end?
Crimped is MUCH easier to install for reliable connector.
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Cable_Male.jpg
> Should I also solder the braid to the
> connector body or should I separate the braid
> and ground it to the airframe or should I trim
> it back and not solder it anywhere. (I soldered braid to connector body)
???? I'm not aware of any connector design (other than
the arcane UHF series) that calls for soldering to the
braid. If you use a connector designed for crimping
as above, then the braid attaches under the sleeve.
The only BNC connector I've ever soldered was this
style:
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Solder_Cable_Male.jpg
and soldering was to the center conductor only. The
shield gets captured under the shield clamp. Installation
instructions . . .
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Install_1.jpg
> Reason I'm asking is that all I'm
> getting from the speaker is a hissing sound. To
> keep it simple I started by hooking up the
> speaker only. nothing else. I suspect my
> coaxial wire (RG58 A/U) because when I pull the
> coax out of the A200 the noise is unchanged..Geoff
I would not necessarily expect the no-signal noise
levels to change by simple adding or deleting an antenna
connection. You need to check first with a hand-held as
an external signal source. Then check on your local
ground services, approach control or ATC radar sector
frequency for traffic with other aircraft.
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
Message 15
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| Subject: | Kind of off topic. Speed sensor needed. |
Google "race car timing systems" and you will get lots of hits for
transponder type systems. Don't know how they would relate to your budget,
but they are widely used, and not just at the professional level, so
hopefully there would be one that would work for you.
Will Slaughter
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Sam
Hoskins
Sent: Monday, December 14, 2009 3:01 PM
Subject: AeroElectric-List: Kind of off topic. Speed sensor needed.
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 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 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 16
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| Subject: | Re: Kind of off topic. Speed sensor needed. |
At 03:01 PM 12/14/2009, you wrote:
>Aeroelectric listers,
>
>We're looking for a bright idea. Preferably an inexpensive one.
>
>The Sport Air Racing League,
><http://www.sportairrace.org/>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 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 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?
Yes, photo cells looking straight up though a tube of 2 - 4"
and length adjusted so that subtended angle of view is sufficiently
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.
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
Message 17
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| Subject: | Re: Kind of off topic. Speed sensor needed. |
College cross country teams use transponders to track runners and their
positions crossing the finish line. Maybe some adaptation of this
equipment could be employed.
----- Original Message -----
From: William Slaughter
To: aeroelectric-list@matronics.com
Sent: Monday, December 14, 2009 9:42 PM
Subject: RE: AeroElectric-List: Kind of off topic. Speed sensor
needed.
Google "race car timing systems" and you will get lots of hits for
transponder type systems. Don't know how they would relate to your
budget, but they are widely used, and not just at the professional
level, so hopefully there would be one that would work for you.
Will Slaughter
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Sam
Hoskins
Sent: Monday, December 14, 2009 3:01 PM
To: Aerolectric List
Subject: AeroElectric-List: Kind of off topic. Speed sensor needed.
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 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 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!
www.aeroelectric.comwww.buildersbooks.comwww.homebuilthelp.comhttp://www.
matronics.com/contributionhttp://www.matronics.com/Navigator?AeroElectric
-Listhttp://forums.matronics.com
Message 18
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| Subject: | Re: Kind of off topic. Speed sensor needed. |
Message 19
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| Subject: | Re: 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 sufficiently
> 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.
>
> Bob . . .
>
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. 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).
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.
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...?
Etienne
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