For making calculations, you're best chance of an answer is in the general Glow engines forum. There are people who have posted formulas over and over again.

Please realize that calculations are very, very approximate at best, and you'll likely never come close to the performance levels your results may give you. Also, please be advised that an O.S. Max .46 LA (there was no .46 FP), will not turn an 11 x 7 propeller at 17,000 RPM. The engine just does not have that kind of power. The extremes of the RPM range stated by O.S. were achieved with some propeller, but not the same. If you prop the engine for a reliable idle at 2,500 RPM, you will not get the 17,000 RPM top end. If you prop the engine to turn 17,000 RPM at full throttle, you won't get a very low idle that is reliable, and the transition from low throttle to high will be erratic.

With an 11 x 7 propeller, you'll likely get a maximum RPM in the mid-10,000's or so.