now THAT was informative.. thank you very much

how are these prop molds made? is it possible to get a prop from someone to laser scan so I can machine a mold? I can scan them and machine the mold, but have zero experience creating a prop, beyond normal sanding to balance/ clipping a bit off the tips to unload better.

it would be neat to make a prop mold for an engine I can get readily, probably the OS91 or similar DF engine.

the molded props look like the have woven fabric in on the outside, is the core a big lump of carbon tow from end to end?


has anyone over in germany played with crankcase length to get a better fuse front end profile (longer less blunt nose)?? or are the harmonics of a longer crank unhealthy for engine life? one would thing that moving the cylinder back 5-8 cm would help make the aircraft cleaner.