I hate to tell you guys but this is a mechanical engineering problem. You think you know what your glow engine puts out based on its displacement but you can't define it in terms of power. You might know it in terms of rpm with a given prop, but you don't know how to calculate the torque it takes to drive that prop at that rpm. Mechanical engineering is much more difficult than electrical.

Bt the way, the way I was taught, all you needed to know was:

F=MA

E=IR

You can't push with a rope

Jim O