Thanks for the input, Right now it runs too good to take apart! This eng. looks kind of funny, but I'll tell you this, the 3 blade prop has a WIDE chord to the blades, and the blades also have an undercamber airfoil. The size of the prop (10X6) , the shear weight of the prop/spinner/flywheel and the way the whole mess spins, leads me to believe that it is closer to a .50, or a very good .46. Anyhow, it has way more than enough power, maybe when I'm done training my buddies I'll use it in my next project-(super top secret neative aspect ratio delta) ouch!
THANKS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!