RV-8F

N772RW

Building, testing and operating an experimental aircraft

SafeAir Pitot and AOA Installation

19 Feb 2014

We finally got around to installing the SafeAir1 Pitot-Static Kit in the wing. We did lots of research on where others have routed the pitot/AOA lines, and decided to do something a little different.

SafeAir Pitot and AOA Routing SafeAir Pitot and AOA Routing (Green & Blue)

It seems most folks route the tubing along the pre-drilled tooling holes in the wing ribs near the main wing spar. As a result, there were several clever solutions for keeping the tubes clear of the aileron drive bell crank.

We wanted to avoid the bell crank completely, and also give some thought to where the tubes would be entering the fuselage. Since we plan to mount our Dynon ADAHRS in the aft section of the fuse, behind the battery, we decided that the pitot/AOA lines should enter the fuse as far aft as possible. This keeps them out of the way of the aileron pushrods, as well as the aft seat footwells, which are located right up near the spar carry-though in the fuselage.

Dynon Pitot Tube Dynon Pitot Tube
SafeAir Kit to Dynon AOA Pitot SafeAir Kit to Dynon AOA Pitot

So we routed the lines mid-way down the wing ribs, and decided that we’d drill the grommet holes in opposite corners of the rib web to minimize stress concentrations in the ribs. We added blue RTV sealant to the grommets to damp vibration.

We figured we could still reach the tubing through either the lightning holes or the inspection covers once the bottom wing skin is riveted, should the need arise.

Anti-Vibration Bracket Anti-Vibration Bracket

The intersection between the SafeAir tubes and the Dynon pitot mast was tricky, as this area needed to be free from vibration. We fabricated a nice bracket out of 0.125” aluminum and bolted it to an existing tooling hole in the wing spar.

Wing Installation Complete Wing Installation Complete

We then routed the pitot and AOA tubing under the floor of the aft fuselage (we’d done the static lines before riveting the turtledeck). We’ll wait to drill the fuselage sidewall pass-throughs until we mate the wings to the fuse.

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