Re: P39 elevator & aileron construction?

In article <45B108EB.4A09@xxxxxxxxxxxxxx>,
Ron Hardin <rhhardin@xxxxxxxxxxxxxx> wrote:

I think they used fabric to eliminate control surface flutter, the
aft-of-hinge mass being less.

I wonder what they used for dope. Nitrate was common but very
flammable, maybe not great on a warplane. I don't think butyrite
was around yet.

Yes -- they used nitrate dope -- just like the Hindenburg! Acetate dope
came in after the war; butyrate a little later, then cellulose acetate
butyrate (CAB). CAB was the standard until Stits, etc. came up with
their products, but on Dacron, they still used nitrate dope to get
adhesion to the fabric.
.