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johngoodman
Joined: 18 Sep 2006
Posts: 530
Location: GA
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 Posted: Sat May 30, 2009 7:06 am Post subject: Re: Engine mount as starter ground path |
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Maybe Bob can address this point:
Bill might be able to use the 8awg wire separately. If the battery is grounded to the airframe right next to itself, and the starter is grounded to the firewall, then the starter is taken care of.
The forest of tabs is most likely common to that firewall ground mentioned above. These would be used for grounding avionics, etc.
The 8awg wire he has already pulled (a long and difficult task in an RV-10) could be used for an "always hot bus". Attach it to the battery in back, and put a fuse block at the panel end. One wire instead of a handful of small ones. He can then pull out the small wires to be used elsewhere. He probably already has the fuse block for the hot bus next to the battery - just move it. No waste of 8awg wire. Just a suggestion, but I like it so much, I might do it myself.
John
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#40572 Phase One complete in 2011 |
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nuckolls.bob(at)aeroelect
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| Posted: Sat May 30, 2009 7:28 am Post subject: Engine mount as starter ground path |
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At 10:06 AM 5/30/2009, you wrote:
| Quote: |
<johngoodman(at)earthlink.net>
Maybe Bob can address this point:
Bill might be able to use the 8awg wire separately. If the battery
is grounded to the airframe right next to itself, and the starter is
grounded to the firewall, then the starter is taken care of.
The forest of tabs is most likely common to that firewall ground
mentioned above. These would be used for grounding avionics, etc.
The 8awg wire he has already pulled (a long and difficult task in an
RV-10) could be used for an "always hot bus". Attach it to the
battery in back, and put a fuse block at the panel end.
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Remotely mounting an always-hot bus is not
recommended. Legacy crash safety conventions
make this simply another remote bus that is
worthy of a battery contactor . . . not ulike
the robust e-bus feeder described in the Z-figures.
| Quote: | One wire instead of a handful of small ones. He can then pull out
the small wires to be used elsewhere. He probably already has the
fuse block for the hot bus next to the battery - just move it. No
waste of 8awg wire. Just a suggestion, but I like it so much, I
might do it myself.
John
|
I've been noodling through some recommendations
for the rear-battery configuration of the RV10.
I'm packed up to head out for M.L. right now so
I don't have time to elaborate.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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tomhanaway
Joined: 12 Aug 2006
Posts: 111
Location: Murphy, NC
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| Posted: Mon Jun 01, 2009 4:04 am Post subject: Engine mount as starter ground path |
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Bob,
The basis of my design is Z-14. Dual Odyssey 680 batteries aft with cross-feed contactor (using one for startup and one for avionics during starting-then switching avionics over to primary battery after running-both batteries available if necessary for starting)) but only one alternator (option to add second alternator later depending on upcoming plane power product). Diode inline allows alternator feed to one or both batteries.
Batteries really both need to be aft due to engine weight considerations.
So... is grounding both batteries at a common point aft in metal plane a viable solution?
I note that you made reference to working on some info specific to the RV-10. That would be great.
Thanks,
Tom
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Robert L. Nuckolls, III
Sent: Thursday, May 28, 2009 9:02 PM
To: aeroelectric-list(at)matronics.com
Subject: RE: AeroElectric-List: Re: Engine mount as starter ground path
At 07:34 PM 5/28/2009, you wrote:
Thanks Bob.
Sorry to beat a dead horse but I need one more clarification. Your response mentions if battery near firewall. The batteries are actually both in the aft area. Can the battery be locally grounded to airframe at site of battery (metal frame craft) with B&C tab forest on firewall for grounds and engine ground?
Or is best solution still to run a 2awg ground wire up to firewall and proceed with grounding to tab forest as above?
Thanks,
Tom
You say "both batteries". Which Z-figure are
you crafting?
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------- | Quote: | | http://www.matronics.com/Navigator?AeroElectric-List |
0123456789
[quote][b]
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RV-10. Built and sold
RV-8a. Building |
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nuckolls.bob(at)aeroelect
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| Posted: Tue Jun 02, 2009 1:27 pm Post subject: Engine mount as starter ground path |
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At 07:00 AM 6/1/2009, you wrote:
| Quote: | Bob,
The basis of my design is Z-14. Dual Odyssey 680 batteries aft with cross-feed contactor (using one for startup and one for avionics during starting-then switching avionics over to primary battery after running-both batteries available if necessary for starting)) but only one alternator (option to add second alternator later depending on upcoming plane power product). |
okay
| Quote: | | Diode inline allows alternator feed to one or both batteries. |
why diodes? close all the contactors and both
batteries get charged by one alternator.
| Quote: |
Batteries really both need to be aft due to engine weight considerations.
So... is grounding both batteries at a common point aft in metal plane a viable solution? |
Sure. Here's some exemplar battery grounds to
airframe:
http://aeroelectric.com/Pictures/Batteries/Battery_Install_OBrien_1.jpg
http://aeroelectric.com/Pictures/Batteries/Battery_Install_OBrien_2.jpg
http://aeroelectric.com/Pictures/Batteries/Battery_Install_OBrien_3.jpg
| Quote: | | I note that you made reference to working on some info specific to the RV-10. That would be great. |
Since the forest of tabs is on thin stainless
(very poor conductor) it would be a good thing
to put a 4 or 2AWG jumper from ground stud to
similar structure as in photos above.
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
[quote][b]
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