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05-16-2023, 06:08 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 6,213
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Loops
Now there's an idea!
Quote:
Originally Posted by Webb
Maybe I’m being cynical but if a crash is sufficient to deform a rear bulkhead and severe a coax cable, then the forward compartment probably could be used for an aluminum coffin.
But to keep in the spirit of things, perhaps a loop in the coax between the bulkheads to provide the “slack” needed to prevent stretching and potential severing of the coax in the event of a crash.
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See below. Already planned
Quote:
Originally Posted by wirejock
<snip>
My plan is to leave service loops, aka crash loops secured with self fusing silicone tape. One near the antenna. One at the F707 bulkhead. One at the ELT.
It holds very well and tears under pressure. Normally, I would put a tie of waxed lashing string, but that stuff will cut wire. Not a good idea.
<snip>
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__________________
Larry Larson
Estes Park, CO
E-mail: wirejock at yahoo dot com
Builder Blog: http://wirejockrv7a.blogspot.com
Donated 12/2022, plus a little extra.
RV-7A #73391, N511RV reserved
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
Last edited by wirejock : 05-16-2023 at 06:24 PM.
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05-24-2023, 10:27 AM
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Join Date: Dec 2015
Location: Spring Hill, FL
Posts: 750
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Snap bushings
Quote:
Originally Posted by Carl Froehlich
If memory serves, this means that all RV-14s built per plans will not pass a DAR.
Carl
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Yes, plans call for penetration through 2 bulkheads complete with snap bushings for the 14. I think a "crash loop" would help but that I'm pretty sure was not in the plans.
__________________
RV-14A QB builds (2017), Lycoming 390 Thunderbolt arrived July 2019, Garmin avionics, Vertical Power, EFII-32 Ignition and Fuel, Whirlwind 300-72, Earth-X batteries, Beringer wheels and brakes, Parts became real airplane 8/15/2020. Started RV-10 Nov 2020. Empennage arrived (Built) Working on QB kits. Garmin avionics, Vertical Power, EFII-32 Ignition and Fuel, Whirlwind 3 blade HRT 378, Earth-X batteries, Beringer wheels and brakes, real airplane hopefully early-mid 2024. Paid subscriber
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05-24-2023, 11:11 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 11,758
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Quote:
Originally Posted by Webb
Maybe I’m being cynical but if a crash is sufficient to deform a rear bulkhead and severe a coax cable, then the forward compartment probably could be used for an aluminum coffin.
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Absolutely not! A certain amount of "crush" is designed into many tail cones to relieve pressure on the shoulder harness and avoid back injuries.
__________________
Mel Asberry, DAR since the last century. Over 1,100 certifications accomplished. Discount for Veterans, Law Enforcement, Fire Fighters.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1, Lifetime EAA.
Recipient of EAA Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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05-24-2023, 12:56 PM
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Join Date: Nov 2018
Location: Pasadena ca
Posts: 278
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Attached is the seminal report on ELT crash performance. Earlier studies showed as many as 15 percent of ELT failures in survivable crashes were due to antenna/cable issues. However during full scale crash tests roughly half resulted in damage to antenna connectors themselves. None were from cable shearing. It also found that many of the cable connectors provided by ELT vendors were not fabricated to MIL-DTL-17 and failed with 1/5th of the mechanical load. The report concluded that the problem could indeed be solved by adding a 10 inch length of cable at both ends using MIL-DTL-17 cable.
https://ntrs.nasa.gov/api/citations/...0170002586.pdf
Mike
__________________
Mike
N36MB
SN 83764
IO360-M1B
Hartzell Composite CS
Phase 1 complete 10/29/22
KEMT
Last edited by Mikeyb : 05-24-2023 at 01:04 PM.
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05-24-2023, 01:18 PM
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Join Date: Jun 2005
Location: Georgetown, TX
Posts: 1,509
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Misinterpretation?
From the Installation Manual for the ACK ELT-04, page 4:
"...and should avoid crossing aircraft production breaks (i.e. riveted fuselage sections)..."
I don't see how drilling a hole in the webbing of a bulkhead, insulating it with a plastic snap bushing, violates the letter or spirit of the installation guidance.
However, for argument's sake, refer to RV-7 DWGs 21 and 26. Drilling a routing hole in the area where the bulkhead halves overlap and are riveted together, wouldn't be recommended (e.g. Detail B, DWG 21).
__________________
Brian Decker
RV-7 (Flying)
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