Here is the problem I have with most prop solutions I have seen so far.

The definition of HP implies that thrust goes to infinity at zero MPH.
Prop efficiency curves imply zero efficiency at zero MPH.

Zero efficiency  times infinite thrust in this case gives a finite static thrust 
number at zero MPH???? 

Next problem. Torque from an engine at zero MPH is finite!

What we need is a prop formula for thrust that has as its inputs; torque,
diameter, pitch, twist, solidity ratio, number of blades, airfoil number, RPM
and forward speed including zero MPH. 

Did I forget anything?

Paul Lamar
 
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