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12-28-2014, 03:42 PM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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The design of an aircraft electrical system involves compromises, just as does the airframe. Considerations are cost, weight, and complexity (more failure points). The way that the RV-12 (and many TC aircraft) is wired, with an unprotected main feeder, has been found to be the best way. But it is not the only way. A fuseable link could be used. But that introduces more failure points. Fuseable links are 4 wire sizes smaller than the wire that they protect. So the fuseable link would be 16 awg. Not only would it be an electrically weak link, but also mechanically weak. So the designer has to weigh the danger of an electrical fire against the danger of a power failure caused by more parts that might fail.
Another approach is to take precautions against the feeder shorting out by using more cushion clamps and wire-ties and using double insulation at critical points like at the firewall penetration.
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Joe Gores
RV-12 Flying
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12-28-2014, 08:18 PM
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Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,820
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When I was a college kid I had an old Corvair that shorted the accessory lead from the positive terminal of the battery. The cable was completely destroyed in seconds. My then girlfriend must have been impressed by my jury rigged repair that got us off the highway because she married me. 😀
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12-28-2014, 09:47 PM
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Join Date: Jan 2014
Location: IA
Posts: 56
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thanks Bill, you have been always a great help !!!
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12-29-2014, 06:47 AM
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Moderator, Asst. Line Boy
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Join Date: Jan 2010
Location: Flower Mound, TX
Posts: 1,473
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A mechanic acquaintance (non-VAF member) read this thread and asked me to offer these thoughts:
"Have been a mechanic all my life so can speak without seeing the problem.... An electrical short will show damage from the source of power to the short but not beyond. He found his problem as it shorted to the throttle and the other cable but not beyond."
__________________
Scroll
Sid "Scroll" Mayeux, Col, USAF (ret)
52F NW Regional/Aero Valley Airport, Roanoke TX (home of DR's Van Cave)
"KELLI GIRL" N260KM RV-7A tipper
Catch her on YouTube's "Because I Fly!" channel
Exemption waived.
Proud and grateful 2020 -=VAF=- Contributor
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12-29-2014, 07:48 AM
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Join Date: Oct 2010
Location: Elkton, Md.
Posts: 1,652
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Quote:
Originally Posted by RFSchaller
When I was a college kid I had an old Corvair that shorted the accessory lead from the positive terminal of the battery. The cable was completely destroyed in seconds. My then girlfriend must have been impressed by my jury rigged repair that got us off the highway because she married me. 😀
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Maybe she married you because of that hot rod you were driving?
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Wag Aero Sport Trainer built,sold and wrecked
N588DF RV12 #336 built, sold and alive and well in New York
N73DF RV12 #244 built, sold and alive and well in Florida
N91 RV RV9 I wish I could say I built this one! Mark Santoleri hit the ball out of the park on this gem.
Currently restoring a 1978 Citabria GCBC
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12-29-2014, 10:22 AM
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Join Date: Dec 2005
Posts: 319
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Quote:
Originally Posted by RFSchaller View Post
When I was a college kid I had an old Corvair that shorted the accessory lead from the positive terminal of the battery. The cable was completely destroyed in seconds. My then girlfriend must have been impressed by my jury rigged repair that got us off the highway because she married me. 😀
Maybe she married you because of that hot rod you were driving?
Or maybe the savings in fuel costs would translate into shoes and purses!?!
Pat
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12-29-2014, 04:35 PM
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Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,820
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The worst breakdown was when the Corvair fan belt broke and I had to use her panty hose to make one good enough to get us 20 miles to a gas station! 😱
God, I miss the 70's! 😀
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12-29-2014, 04:48 PM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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Quote:
Originally Posted by RFSchaller
The worst breakdown was when the Corvair fan belt broke and I had to use her panty hose to make one good enough to get us 20 miles to a gas station!
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Worst breakdown?? I'd rate that one as excellent!!
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rgmwa
RV-12LR 912ULS
120346
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01-11-2015, 05:33 PM
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Join Date: Oct 2006
Location: arvada, co
Posts: 445
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Photos
Hello Jim,
I am in the midst of my annual and would appreciate any photo so I might review my installation. Thanks, hope the repairs are going well.
__________________
Patrick Claar
Arvada, CO BJC
RV12, #401, Flying 2013, N612PC
RV6, 1996-2010 sold
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