Ed,

the design (shape) of the prop doesn't directly influence engine power or torque; only indirectly. It does, however, directly affect engine thrust.

Engine power is essentially a product of prop rpm and torque - omega tau. Naturally, proper units must be used according to how one wants power expressed (HP, Watts, etc.). In the absence of torque measurements, there is a way to derive crank power as a function of prop geometry (pitch and diameter) and crank rpm. Using SAE units, brake horsepower can be expressed as:

BHP = (P*D^4*RPM^3) / (1.4 * 10^17)

I won't go through the derivation as it would not only boring but also tedious to write on the forum with the kind of notation one can use. In the formula, P, D and RPM stand for prop pitch, diameter and rpm, respectively.

Using this, I calculated the crank power of the P80 based on the figures you provided.

I think that engine can produce more power than this with a little less oil, more nitro and, of course, a tuned exhaust for the prop desired.

David