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RV-7 Construction Log
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Date:  8-3-2013
Number of Hours:  1.00
Manual Reference:  
Brief Description:  Pitot and Angle of Attack Plumbing

VERY little work in the last 5 weeks or so, and I'm having a bit of trouble getting back into the swing of things. According to the instructions it's time to bend longerons, but I want to get the wings structurally complete and get them moved to the airport before I start making BIG pieces of the fuselage in the garage.

All I did today was work on figuring out the routing the pitot and angle of attck plumbing in the wing. I inserted 3/8 od, 1/4 ID snap bushings in the right wing, and I'm just now figuring out that's the WRONG wing! No biggie, they're easy to remove... The 3/8 holes I drilled near the forward end of the ribs are going to bring the tubing close to the aileron bellcrank, but with a couple of adel clamps, I can guarantee that there won't be interference.

I've seen several methods of adapting the 3/16 aluminum tubing that comes on most pitot/AOA probes to the1/4" plastic tubing for getting those pressures to the cockpit. Most leave the connection "hanging", ie. not attached to any structure. To alleviate this, I found the bulkhead fittngs shown in the photo below at They adapt the 1/4" plastic tubing to 1/8 " female NPT, into which I'll put an AN816-3D fitting to adapt to the 3/16" tubes. These fittings are chrome plated brass and a tad on the heavy side, but there's only two them, and I won't have to worry about fatiguing of the aluminum tubes.
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