Thank you so much for the link. I played around with the file, and in attemp to calculate "static thrust", I simply reduce the airspeed to 0.01.

I got very encouraging results, which match reality pretty well. The only thing is that we can't change the chord width to take account of wide prop vs narrow.

It seems like the max static thrust an engine can produce using the best prop is roughly:

5 x HP rating for 2 strokes
6 x HP rating for 4 strokes

What do you all think?