Tuesday, February 6, 2018

Update February 6th: Bottom wing skins riveted, Pitot tube installation

Since last post, I've ordered a Garmin heated pitot/AOA (regulated).  I decided to make a change based on advice from Vic (from unregulated).  This required adding a single 22ga wire to the power wires already in place.  Easy to do this with the conduit in place.

I've fitted the pitot tube to the mast, trimmed and shaped the aluminum tubes in the pitot, completed wiring setup for the pitot, and drilled the access plate to fit the control box with wires.  Also continued to tidy up wiring in the wing.

Completed prep of wing bottom skin (deburr, dimple, scuff, prime) and test fitted skin and fittings.  While testing the skin and pitot mount fit, I wasn't happy with the mating of the pitot mast base and the angle support (riveted to adjacent rib): the matchup wasn't perfect and rather than resting on the full angle, the mast support was just touching a portion of it.  I decided to make a "shim" rather than re-fit the angle.  I mixed up some epoxy/flox, waxed the back of the pitot base, and clecoed the entire structure together.  The flox mixture filled the gap pefectly: after curing, the support came right off the "shim" and now rests fully on the "matched" angle support (now shimmed to match up perfectly).  (forgot to take a photo of this...).  I decided to drill the one rivet that uses this support out to 1/8 and used a Cherrymax rivet - a standard rivet would have to be very long and it would be hard to buck. 

Yesterday completed the riveting of the bottom skin.  Today final install of pitot tube.





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