I can't find any rpm numbers on this engine floating around anywhere. I'd like to know how it turns, what props it likes, etc. and also how this engine compares to others in it's class. Also, what is the maximum weight a .75 can fly around comfortably, assuming a proper wingloading?

The .75 size engines are meant to slightly over power a .61 size airplane. The Tower is a good running, ABC engine.

I would try a 13-6, 13-7, or 12-8 prop.

The Tower .61 has been reported to be the Super Tigre .61 built in China from ST tooling that was bought by Great Planes. That being the case, I would suspect the Tower .75 is an ST .75 with a purple head and a Tower logo on the bypass.

I have the th .75 and it seems to like a apc 12x7 the best.