RV-6 HOW TO: Wing wiring for Heated Pitot & AOA tube

[Bad Sheila]

How do I run wing wiring for Heated Pitot & an AOA tube to my Dynon heated pitot?

Any help would be appreciated

[LifeofReiley]

If you already have conduit in the wing, tie a string to a cotton ball and suck it thru with a shop vac... then tie your wires on the end of the string and pull them.

[Bob'sRV6A]

I'll use #18 AWG for the black (back to firewall ground) and red 14V, and #22 for the white signal wire that goes to the EMS.
Per instructions, I'll run the heater off a switch/10A fuse with the on/off warning feature shown on the skyview. I am going to order Van's corregated plastic conduit http://www.vansaircraft.com/cgi-bin/...wiring-conduit
Hope this helps,
Bob

[Bad Sheila]

Where have you put the sender unit for the heater. They say as close as possible but I have had to put the pitot inside the wing inspection plate. I have to put it in the wing-tip or the fuselage. where have you got yours?

[cfiidon]

In this first photo you can see inside the outermost inspection port of my -8 wing (looking in and aft as it sits in the cradle). I mounted the controller here on small standoffs made from aluminum tube to clear the "bump" on the rib.



In the second image you can see how I mounted the pitot assembly, one bay outside the inspection access hole. This location has it's pluses and minuses... with it here the tie-down rope or chain "might" interfere if you are not careful. I ran the tubing for the pressure and AOA thru the pre-punched holes in all the ribs. I ran the wiring thru a third row of holes, although I had to open up the holes in the innermost four ribs. Don't think I have a pic of that, although I can tell you I used a very long drill bit to do so.

Hope this helps.
Don

[Bad Sheila]

Don,
Thanks for photos. Did you use conduit for the tubing and why a 3rd hole for the wiring?

[cfiidon]

If I recall correctly, there are three holes in each rib just aft of the spar (don't know if yours differs). Only one hole was large enough for a bushing. I put bushings in the center large hole and ran wire thru there. I did install conduit for other wiring in the aft portion of the wing.

When I ran the Pitot and AOA tubes I decided to drill out the other two holes and also install snap bushing. You can probably see them in my photo. Rather than go thru conduit in the lightening holes, I opted to spend a little time and make use of those holes.

It can be done with the right drill (an angle adapter helped) and a long bit for the closely spaced ribs near the wing root.

Have fun.

Don