mtwister,

I don't know where you get that the ST75 is underpowered............?????? A lot of scale warbirds recommend this engine for in-cowl installations for airplanes weighing 10-12 pounds unless you are talking the talk of most sport pilots that demand unlimited vertical. This is an engine that will fly a 10-12 lb airplane in a very scale application..........so if you are one of those that demands very overpowered aircraft this engine will not do......but if you are looking for more scale than this engine is just fine. Real airplanes do not take off in 10 feet and do 3D operations which are operations that real airplanes will not do.

Regards,
Andy