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  #21  
Old 12-28-2014, 03:42 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
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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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  #22  
Old 12-28-2014, 08:18 PM
RFSchaller RFSchaller is offline
 
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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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  #23  
Old 12-28-2014, 09:03 PM
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Bill_H Bill_H is offline
 
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HTHAMAN - pics of the additional ground wire(s) are here:
http://www.vansairforce.com/communit...&postcount=240
Van's does not think these are necessary.
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  #24  
Old 12-28-2014, 09:47 PM
hthaman hthaman is offline
 
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Location: IA
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thanks Bill, you have been always a great help !!!
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  #25  
Old 12-29-2014, 06:47 AM
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scrollF4 scrollF4 is offline
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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."
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Sid "Scroll" Mayeux, Col, USAF (ret)
52F NW Regional/Aero Valley Airport, Roanoke TX (home of DR's Van Cave)
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  #26  
Old 12-29-2014, 07:48 AM
Dave12 Dave12 is offline
 
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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?
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  #27  
Old 12-29-2014, 10:22 AM
gorbak gorbak is offline
 
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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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  #28  
Old 12-29-2014, 04:35 PM
RFSchaller RFSchaller is offline
 
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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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  #29  
Old 12-29-2014, 04:48 PM
rgmwa rgmwa is offline
 
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Location: Perth, Western Australia
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Quote:
Originally Posted by RFSchaller View Post
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! ��
��
Worst breakdown?? I'd rate that one as excellent!!
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  #30  
Old 01-11-2015, 05:33 PM
funflying funflying is offline
 
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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.
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