- Sep 17, 2008
That's mostly because homebuilders are trying to obtain an airplane economically. (Some do it for the art of it, the joy of creating.) Everything you farm out instead of doing it yourself raises the price of the airplane, and at some point you're better off just getting a second job---or working some overtime---to pay for buying an airplane. It's a lot surer way to get flying within a few years.No other plans seller prescribes heat treatment, as far as I know. They all use 6061-T6 or T4 as supplied and use fluting instead of heat treating.
Even Cessna used fluted ribs. Heat treating costs money. The only time I ran into heat-treated -O parts was on transport-category airplanes, and it wasn't cheap. The shop had an oven but nobody certified to do the work. It's not that simple, and a mistake can be lethal.