REFLECTOR: Starter contactor
Douglas Holub
douglas.holub at gmail.com
Thu Jul 18 20:32:08 CDT 2013
You're right, #2 vs. #4 is a better comparison since the voltage drops are about equal.
----- Original Message -----
From: Laurence Coen
To: Velocity Aircraft Owners and Builders list
Sent: Thursday, July 18, 2013 8:44 PM
Subject: Re: REFLECTOR: Starter contactor
Doug,
My wire table doesn't go to OO wire but it does include #2 which I use with my set-up. I also think that the current in a 12 volt system will be more like 200 amps which comes out to 0.6 volt drop @ 200 amps and 20' is 4 lbs. A 24 volt system with #4 gives a 0.5 volt drop and weighs 2.5 lbs.
Larry Coen
N136LC
From: Douglas Holub
Sent: Thursday, July 18, 2013 6:56 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Starter contactor
Oops. I calculated the power lost in the wire, not the voltage drop. They would both lose about 3.5 watts, but both systems would drop much less than 1 volt. Ideally. Assuming all of the connections were perfect.
Doug
On Thu, Jul 18, 2013 at 7:51 PM, Douglas Holub <douglas.holub at gmail.com> wrote:
Just out of curiosity, I calculated how much wire weight would be saved by using a 24 volt system vs. a 12 volt system.
Assumptions: 0.07 mohm/ft for 00 AWG, 29 mohm/ft for 4 AWG, 10 feet each way from the battery to the starter, 50 amp starter load at 12 volts, 25 starter load at 24 volts.
With the 12 volt system you would lose 3.5 volts across the starter wires while starting and the wire would weigh 7.5 lbs.
For the 24 volt system you would lose 3.6 volts and the wire would weigh 2.4 lbs.
Doug Holub
On Thu, Jul 18, 2013 at 8:10 AM, David Ullman <ullman at robustdecisions.com> wrote:
If you are referring to what I call the starter solenoid, mine is on the
firewall. I thought that was where most people put them to keep the wire
weight down. I have my main in the front.
David Ullman
N444DX
President EAA 292
541-760-2338
david at davidullman.com
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Today's Topics:
1. Does anyone have their starter contactor on the firewall?
(Don Johnston)
2. Re: Does anyone have their starter contactor on the
firewall? (Tim Rhodenbaugh)
3. Re: Does anyone have their starter contactor on the
firewall? (Don Johnston)
4. Speed Brake (John Dibble)
5. Re: Does anyone have their starter contactor on the
firewall? (nmflyer1 at aol.com)
6. Re: Does anyone have their starter contactor on the
firewall? (Scott Derrick)
----------------------------------------------------------------------
Message: 1
Date: Wed, 17 Jul 2013 13:10:39 -0500
From: Don Johnston <numa at comcast.net>
To: reflector at tvbf.org
Subject: REFLECTOR: Does anyone have their starter contactor on the
firewall?
Message-ID:
<CALD29ir2d+_B6u=Ew5U0Ze_+Se2S0UVo7z6oUJe0YkuonF6-WQ at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
I've got the gear pump assembly from Wayne Lanza which has the battery and
the starter contactor on it.
I'm looking at the wiring and having to run the B-leads from the alternators
all the way up to the nose. It occurred to me that I if the starter
contactor was on the firewall that I could run the alternators to the
battery side of the starter contactor which would allow me to utilize the
low gauge wire already in place between the the starter and battery
contactor.
But every Velocity that I've looked at has the both contactors in the front.
Just wondering anyone has their starter contactor on the firewall.
-Don Johnston
XL-RG
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Message: 2
Date: Wed, 17 Jul 2013 14:18:33 -0400
From: Tim Rhodenbaugh <timrhod at aol.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Subject: Re: REFLECTOR: Does anyone have their starter contactor on
the firewall?
Message-ID: <26CDE257-6421-49A0-AD29-FD026E202CDE at aol.com>
Content-Type: text/plain; charset=us-ascii
It's been done. I put mine on the firewall. Are you sure it's the starter
contractor on the pump assembly board and not the master contractor? Tim
Rhodenbaugh n370TR XLRG
Sent from my iPad
On Jul 17, 2013, at 2:10 PM, Don Johnston <numa at comcast.net> wrote:
> I've got the gear pump assembly from Wayne Lanza which has the battery and
the starter contactor on it.
>
> I'm looking at the wiring and having to run the B-leads from the
alternators all the way up to the nose. It occurred to me that I if the
starter contactor was on the firewall that I could run the alternators to
the battery side of the starter contactor which would allow me to utilize
the low gauge wire already in place between the the starter and battery
contactor.
>
> But every Velocity that I've looked at has the both contactors in the
front.
>
> Just wondering anyone has their starter contactor on the firewall.
>
> -Don Johnston
> XL-RG
> _______________________________________________
> To change your email address, visit
> http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery! www.tvbf.org/gallery user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail Check old archives:
> http://www.tvbf.org/archives/velocity/maillist.html
------------------------------
Message: 3
Date: Wed, 17 Jul 2013 13:30:11 -0500
From: Don Johnston <numa at comcast.net>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Subject: Re: REFLECTOR: Does anyone have their starter contactor on
the firewall?
Message-ID:
<CALD29iqf--7FFRExbsu4+XKK8x8jLz_=gs+QVas1rhPGW7i09Q at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
I'm sure. :-)
http://www.velocity-xl.com/blog/wp-content/uploads/2011/11/2011-11-16-DSC_01
40.jpg
-Don
On Wed, Jul 17, 2013 at 1:18 PM, Tim Rhodenbaugh <timrhod at aol.com> wrote:
> It's been done. I put mine on the firewall. Are you sure it's the starter
> contractor on the pump assembly board and not the master contractor? Tim
> Rhodenbaugh n370TR XLRG
>
> Sent from my iPad
>
> On Jul 17, 2013, at 2:10 PM, Don Johnston <numa at comcast.net> wrote:
>
> > I've got the gear pump assembly from Wayne Lanza which has the
> > battery
> and the starter contactor on it.
> >
> > I'm looking at the wiring and having to run the B-leads from the
> alternators all the way up to the nose. It occurred to me that I if
> the starter contactor was on the firewall that I could run the
> alternators to the battery side of the starter contactor which would
> allow me to utilize the low gauge wire already in place between the
> the starter and battery contactor.
> >
> > But every Velocity that I've looked at has the both contactors in
> > the
> front.
> >
> > Just wondering anyone has their starter contactor on the firewall.
> >
> > -Don Johnston
> > XL-RG
> > _______________________________________________
> > To change your email address, visit
> http://www.tvbf.org/mailman/listinfo/reflector
> >
> > Visit the gallery! www.tvbf.org/gallery user:pw =
> > tvbf:jamaicangoose Check new archives: www.tvbf.org/pipermail Check
> > old archives: http://www.tvbf.org/archives/velocity/maillist.html
>
> _______________________________________________
> To change your email address, visit
> http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery! www.tvbf.org/gallery user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail Check old archives:
> http://www.tvbf.org/archives/velocity/maillist.html
>
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Message: 4
Date: Wed, 17 Jul 2013 13:52:04 -0500
From: John Dibble <aminetech at bluefrog.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Subject: REFLECTOR: Speed Brake
Message-ID: <51E6E7D4.1050905 at bluefrog.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
A small amount of hydraulic fluid is leaking at the back side of my speed
brake. Looking on the inside it seems to originate where the "cylinder"
connects to the brake. Does the speed brake use hydraulic fluid? If so,
does it come from the retract system, or is it separate?
Thanks,
John
------------------------------
Message: 5
Date: Wed, 17 Jul 2013 15:24:26 -0400 (EDT)
From: nmflyer1 at aol.com
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Does anyone have their starter contactor on
the firewall?
Message-ID: <8D0513A62DEDC1F-D2C-ACF32 at webmail-d143.sysops.aol.com>
Content-Type: text/plain; charset="us-ascii"
Both my contactors are in the nose. Running a condiut ground with the main
cable running inside that. Alternator wire runs to the contact point on the
starter where the main cable attaches.
Note: 2-seperate battery system.
Kurt
-----Original Message-----
From: Don Johnston <numa at comcast.net>
To: reflector <reflector at tvbf.org>
Sent: Wed, Jul 17, 2013 12:13 pm
Subject: REFLECTOR: Does anyone have their starter contactor on the
firewall?
I've got the gear pump assembly from Wayne Lanza which has the battery and
the starter contactor on it.
I'm looking at the wiring and having to run the B-leads from the alternators
all the way up to the nose. It occurred to me that I if the starter
contactor was on the firewall that I could run the alternators to the
battery side of the starter contactor which would allow me to utilize the
low gauge wire already in place between the the starter and battery
contactor.
But every Velocity that I've looked at has the both contactors in the front.
Just wondering anyone has their starter contactor on the firewall.
-Don Johnston
XL-RG
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o change your email address, visit
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Message: 6
Date: Wed, 17 Jul 2013 13:24:35 -0600
From: Scott Derrick <scott at tnstaafl.net>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Subject: Re: REFLECTOR: Does anyone have their starter contactor on
the firewall?
Message-ID: <51E6EF73.8080103 at tnstaafl.net>
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