BTW, I'm assuming that the Seidel 7-70 would be suitable to use in a 1/4 scale "round cowl" WWI model. I image it could also fly a 1/3 scale Pup or something like that. Actually, it's probably more than enough power for 1/4 scale but would allow a scale diameter prop turning at something like scale speeds. I wouldn't mind cruising at 1/4 throttle! What would be the equivalent in terms of a gas engine or 4-stroke glow engine? I'm imagining something like either an G62 or a 4-stroke 180.