Originally Posted by cczarnik
Minimum driven head thickness .038 per Mil Spec. That's a lot thinner than what you get with the 1.5D rule of thumb for the shop head.
Actually, using the .5 rule of thumb for thickness the nominal would be about .047 thick so only about .009 difference. A couple in the photo looked like they might be thinner than the Mil Spec minimum, but maybe not.
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Van's Aircraft Engineering Prototype Shop
RV-6A (aka "Junkyard Special ")