Building an Experimental Airplane, The Vans RV-7A | EP2.14 Ailerons - Ryan Flys Watch in HD on YouTube! Share on Facebook! Ailerons! From start to finish. Building the ailerons was a bit of an undertaking--not as easy as I thought they might be. All familiar things, after building the elevators: stiffeners attached to a folded skin that must be final bent to shape to mate to a spar. And the usual drilling, deburring, priming, and more deburring that goes with these things.