Not too operational, but this curve does illustrate what
we are looking for and the effects of over/under prop regarding HP (still not
thrust, so not exactly what I am looking for).
Curve A shows an over-prop condition where the load of the
prop intersects the engine HP curve before the engine has reached its max
HP. Curve B shows that with too little prop you hit the engine RPM limit
before it can deliver max HP. But, again I would like to see a
similar curve comparing Thrust and Prop RPM.
The ideal prop shows the maximum prop load intersecting
the engine HP curve at Max HP/Max RPM. I suspect that most Prop
manufactures must have something along these lines in either equations or charts
to work from. You specify your engine HP and desired Prop rpm and they
produce the prop that fits you specs.