This is what the blade airfoil should look like up closer to the hub.
This is the 12% section Bill mentioned. It is a slight drag tradeoff
for blade torsional and bending stiffness. the blade should be tapered
on out to the 6% airfoil at the tip where the speed is close to Mach
one.

Paul Lamar
 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org