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Leo Holler
Joined: 29 Mar 2007
Posts: 7
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 Posted: Fri Apr 06, 2007 11:43 pm Post subject: Starter contactor location |
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I am planning to locate my battery (RG type), battery contactor, and voltage regulator in the left boot cowl area of the cabin in my PA-22/20. I also have room to locate the starter contactor there as well, all within inches of the battery and access all from a planned door on the boot cowl. The starter contactor would be only a few inches from the firewall.
It seems I have read where Bob says that the starter contactor should be kept close to the starter. Is this location close enough or is it better to move it to the engine side of the firewall (about 4 to 5 inches closer to the starter)?
Thanks for any help.
Leo Holler
leoh(at)gci.net
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nuckollsr(at)cox.net
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| Posted: Sun Apr 08, 2007 5:15 am Post subject: Starter contactor location |
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At 12:43 AM 4/7/2007 -0700, you wrote:
| Quote: |
I am planning to locate my battery (RG type), battery contactor, and
voltage regulator in the left boot cowl area of the cabin in my PA-22/20.
I also have room to locate the starter contactor there as well, all within
inches of the battery and access all from a planned door on the boot cowl.
The starter contactor would be only a few inches from the firewall.
It seems I have read where Bob says that the starter contactor should be
kept close to the starter. Is this location close enough or is it better
to move it to the engine side of the firewall (about 4 to 5 inches closer
to the starter)?
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The reason for suggesting that starter contactor mount on the firewall is
that is serves as a an attach-point for the alternator's b-lead
to tie into the system's fat-wires using local b-lead circuit
protection (ANL limiter or equal). It's a logistics thing that
goes toward the performance issue of getting as many fat-wires
as possible out of the cockpit . . . especially the b-lead feeder.
Everybody who's anybody is driving in that direction. See:
http://www.aeroelectric.com/Pictures/Wiring_Technique/Firewall_Ckt_Protection.jpg
. . . here you can see a variety of circuit protection for
both loads and sources that have been pulled out of the
cockpit and moved to the firewall. Mounting your starter
contactor on the firewall provides the fat-wire terminal
for bringing the battery feeder and b-lead feeder together
on the 5/16" stud . . .
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
----------------------------------------
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list(at)toddheffley.com
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| Posted: Sun Apr 08, 2007 6:23 am Post subject: Starter contactor location |
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Leo,
The reason for the for the "close to the starter" idea is physical
cable routing.
For example, an aft battery airplane would have a Battery contactor in
the back, Heavy wire to the fire wall, Starter contactor, then heavy
wire to the Starter.
This way, the Heavy wire from the back powers various busses before it
gets to the Start Contactor.
You have the best of both worlds, Battery and both Contactors all
together, short cable runs.
Don't forget to look up Bob's Comic books on bridges from Contactor to
Contactor. Much cleaner than short Lug-to-cable-to-lug.
Did I miss anything?
todd
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list(at)toddheffley.com
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| Posted: Sun Apr 08, 2007 6:35 am Post subject: Starter contactor location |
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OOPS
Bob had already replied, my bad.
Todd
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nuckollsr(at)cox.net
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| Posted: Mon Apr 09, 2007 4:42 am Post subject: Starter contactor location |
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At 10:34 AM 4/8/2007 -0400, you wrote:
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OOPS
Bob had already replied, my bad.
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NOT AT ALL my friend. It's not uncommon that a question
here on the list generates more than one answer. Many times
the answers are identical, but sometimes just similar or
even an alternative. No matter how what you answer or
whether it's repetitive, the act of formulating a
collection of ideas into cogent words is a tool of
the teacher. If you simply parrot what I or anyone
else offers then you're demonstrating a level of
knowledge but your ability to teach the concept from
a position of understanding is not demonstrated.
When you offer words that describe a collection of
simple-ideas crafted into a recipe for success that
you understand, then sir you are honing your skills
as a teacher and that is appropriate any time.
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
----------------------------------------
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Leo Holler
Joined: 29 Mar 2007
Posts: 7
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nuckollsr(at)cox.net
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| Posted: Wed Apr 11, 2007 4:40 am Post subject: Starter contactor location |
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At 09:58 PM 4/10/2007 -0700, you wrote:
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Thanks Bob and Todd for your sage advice on the "fat" wires and locating
my starter contactor. After reviewing what I had planned regarding the
contactor, I found that I may have had a misplaced electron (or maybe I
was short a few) in my brain housing group [Embarassed] I must also admit
that I'm a bit bummed about the AeroElectric list. Bummed because I spent
a lot of time over the last several months trying to figure out my new
electrical system and most all of the answers were already here for the
asking. I just didn't get here soon enough. Guess I should thank someone
at B & C for the tip. Don't go away because I'm sure that more answers
will be needed in the future. Thanks again.
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You're most welcome sir. That's what the List is
here for.
I did a presentation for the local PAMA chapter of
avionics and electrical technicians here I Wichita
last night. From the kinds of questions fielded during
and after the talk, I thought many of those folks would
benefit from the networking function that the List serves
for tapping the collective gray matter of numerous folks.
I described List functions to them and invited them
to join in and see if they can perceive any benefits.
We may be getting some new members from "the dark side"
of general aviation.
Bob . . .
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I must also admit that I'm a bit bummed about the AeroElectric list. Bummed because I spent a lot of time over the last several months trying to figure out my new electrical system and most all of the answers were already here for the asking. I just didn't get here soon enough. Guess I should thank someone at B & C for the tip. Don't go away because I'm sure that more answers will be needed in the future. Thanks again.