The 0.065 321SS held up well on the Arrow.  The metallurgists explained it
to me this way.  At rotary temperatures the Nickel and Chromium atoms will
migrate to the outer wall leaving behind a weak, low temperature, rustable
iron.  So the thicker the wall the longer it will take.  Perhaps ceramic
coating the interior wall will mitigate this process allowing for less
exotic (and expensive and heavy) materials.

Anyhow, you best have a 3 rotor tangential under your arm!

See you in a month or so,

Stephen

I'll build you one for lots of money :)
Send me a picture of the side of the engine in the airplane so it
won't interfere with the cowl or something else.

Paul Lamar