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06-09-2018, 05:25 PM
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Join Date: May 2016
Location: St Albert, Alberta, Canada
Posts: 515
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Quote:
Originally Posted by johnbright
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Forgive my ignorance but why wouldn't you just stack the terminals for the primary and secondary power inputs on the stud provided? Seems like there is plenty of room.
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Randy P.
1st time builder
RV10 - QB wings and fuse. Working on cabin top
St. Albert, Alberta, Canada
Reserved:C-GRPY
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06-09-2018, 05:40 PM
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Join Date: Aug 2010
Location: Newport News, Va
Posts: 325
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Quote:
Originally Posted by RandyAB
Forgive my ignorance but why wouldn't you just stack the terminals for the primary and secondary power inputs on the stud provided? Seems like there is plenty of room.
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The concept is that if there is somehow a failure at one stud there will be a backup stud. There will be two independent power sources into the bus and it gives greater reliability to have separate studs also.
Last edited by johnbright : 08-11-2020 at 08:41 PM.
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06-09-2018, 05:42 PM
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Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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I can follow his logic. If you feel you need redundant power feeds to a bus, the single stud would be a single point of failure for both feeds if it came loose.
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06-09-2018, 06:59 PM
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Join Date: Nov 2006
Location: Savannah, GA
Posts: 1,029
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Thanks, John! I've been musing over that very idea and you've saved me some work. Nice pictures!
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RV-7ER - finishing kit and systems installation
There are two kinds of fool in the world. The first says "this is old, and therefore good"; the second says "this is new, and therefore better".
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06-09-2018, 10:16 PM
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Join Date: May 2016
Location: St Albert, Alberta, Canada
Posts: 515
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Quote:
Originally Posted by rv7charlie
I can follow his logic. If you feel you need redundant power feeds to a bus, the single stud would be a single point of failure for both feeds if it came loose.
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Ya I suppose. Unlikely but possible.
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Randy P.
1st time builder
RV10 - QB wings and fuse. Working on cabin top
St. Albert, Alberta, Canada
Reserved:C-GRPY
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06-10-2018, 09:48 AM
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Join Date: Mar 2005
Location: Calgary, Canada
Posts: 5,766
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As I posted in the CPI thread, if you're concerned about a single stud, just split your power supply setups with 2 smaller fuse blocks, say a couple six slot ones instead of a single 12 slot.
I'm not sure how the stud would fail on the Cole Hersee one I showed, since it's actually a bolt penetrating the power strap, unless you way over torque it. Are you folks worrying about all the single points of failure inside that single engine up front too?
Maybe we should be looking at fitting a couple of these to drop out of the belly if the electrical system or powerplant takes a dump?

Last edited by rv6ejguy : 06-10-2018 at 01:56 PM.
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06-10-2018, 10:21 AM
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Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,189
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but...
What the failure mode on that system? 
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Bob
Aerospace Engineer '88
RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...
Dues+ Paid 2019,...Thanks DR+
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06-10-2018, 10:29 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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06-10-2018, 12:11 PM
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Join Date: Mar 2005
Location: Calgary, Canada
Posts: 5,766
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Quote:
Originally Posted by Walt
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My idea covers failure of both powerplant and electrical systems plus propeller malfunctions too... 
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06-10-2018, 12:14 PM
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Join Date: Mar 2005
Location: Calgary, Canada
Posts: 5,766
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Quote:
Originally Posted by rocketman1988
What the failure mode on that system? 
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Yes, I see, we'd need independent ignition and fuel systems for each turbine plus a separate door and actuator system to drop them into the airstream independently. Plus a fire warning system, fire extinguishing systems and N1 indicators... 
Last edited by rv6ejguy : 06-10-2018 at 01:16 PM.
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