Must be an early Evolution TPS Alpha Trainer Engine ... they came with a special three bladed prop on the Alpha 40 Trainer .. JJ
I think Joe Gilbert tried one flight on an airplane of De's with an OS 40 4S and the 3 blade Evo prop and it would barely do a wingover. Not sure what happened to the prop but if it's still around I am sure it can be had pretty cheap.
Lol, ok... I guess it was designed for the full throttle R/C crowd.
What can you tell me about it?