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brianpublic2(at)starband.
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 Posted: Mon Nov 13, 2006 10:02 am Post subject: how to handle grip switch wiring |
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How are people dealing with handling the moving wires in the case of a plane with control stick grip switches?
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It seems the least amount of wiring movement would be had if I drill a hole in the side of the stick (this is RV-7A, but presumably same situation for all RV models) right near the weld, closest to the pivot point. But it would be extremely difficult to feed wires down the tube, then get them to make a 90 degree turn out the side of the stick. In the case of Infinity Aerospace grips with the wire bundle having about a dozen wires in it and being ¼”-5/16” in diameter, this would be even more difficult.
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If the wires are run out the bottom of the stick, it looks like the wires will have to be moving around quite a bit with the stick. I can see leaving enough slack to allow for the full range of stick movement, but I am concerned about causing fatigue in the wires with so much constant wire movement. It will also have to be carefully laid out so it can’t catch on anything.
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I know lots of people have RVs with stick grip switches. How are others handling this?
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Thanks,
brian
http://brian76.mystarband.net/RV-7Ahome.htm
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Ollie Washburn
Joined: 10 Jan 2006
Posts: 56
Location: Central Florida
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| Posted: Mon Nov 13, 2006 10:30 am Post subject: how to handle grip switch wiring |
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Just let it all hang out. 6 years, 1100 hours and they haven't broken yet.
Ollie 6A
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Ollie RV6-A & Rans S7S
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gerf(at)gerf.com
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| Posted: Mon Nov 13, 2006 11:37 am Post subject: how to handle grip switch wiring |
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Had similar concerns this last week as I completed the same
task. I drilled a hole just above the pivot point so that the
wires exited forward. Installed a rubber grommet and fed the
wires through the hole first and then up length of the stick.
I used excess lengths of wire so I could terminate the wires in
the grip and then feed them back down as I installed the grip
on the tube. With the wires exiting forward above the pivot
point it keeps them out of the way of the moving parts down
below and feeds them directly into the wiring loom directly
behind the wing spar (RV-9).
HTH
g
[quote] Just let it all hang out. 6 years, 1100 hours and they haven't
broken yet.
Ollie 6A
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Mark Phillips in TN
Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN
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| Posted: Mon Nov 13, 2006 11:42 am Post subject: how to handle grip switch wiring |
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In a message dated 11/13/2006 12:42:01 PM Central Standard Time, brianpublic2(at)starband.net writes:
| Quote: | | How are people dealing with handling the moving wires in the case of a plane with control stick grip switches? |
>>>>
Here's one approach- has worked well for 370 hours so far:
http://websites.expercraft.com/n51pw/index.php?q=log_entry&log_id=7599
Click on the foto for the bigger picture...
From The PossumWorks in TN
Mark
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From The PossumWorks... |
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rv8striker(at)hotmail.com
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| Posted: Mon Nov 13, 2006 11:46 am Post subject: how to handle grip switch wiring |
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I drilled a hole just above the welds in the rear of the tube. I put a rubber grommet in the hole and ran the wires (bundled six conductor if I recall) up the tube to the grip. At the bottom I attached the cable to the spar with an Adel clamp leaving enough slack to allow full travel in all directions. 75 hours with no problems.
Steve Struyk, RV-8
St. Charles MO
75 hours. Doing first annual inspect.
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lhelming(at)sigecom.net
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| Posted: Mon Nov 13, 2006 3:56 pm Post subject: how to handle grip switch wiring |
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You are correct in suggesting drilling a hole for the wires at the point of pivot for the stick. That yields the smallest movement and wear on the wires. Put a loop in the wires coming out and ty wrap it to the rib to avoid chaffing from vibration. Then test it by moving the stick round. Then put that area on your annual check list to see how things are going.
You can get the wires out a pretty small hole by using a piece of safety wire with a hook on it. You will probably be doing this more than once. It gets easier the second and third time. You can do it one wire at a time. Just use a slightly bigger hole. (I only had two wires.) Indiana Larry
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