Bending Longerons | EP3.5, Building an Airplane: The RV7A - Ryan Flys Watch in HD on YouTube! Share on Facebook! A bonus mid-week episode, even if a short one, showing how to form the two longerons on my experimental airplane build. On the longerons, each one takes a curve, a bend, and a twist. Like most things, two are required here, and I share the best way to get mirror images of each part.