oggers, please re-read post #144. I made it pretty clear that there are two kinds of efficiency, one for static thrust, and one for propulsive efficiency. Please - when you refer to "efficiency" - make it clear which you are talking about.
According to Hubert C Smith, Associate Professor Emeritus, Penn State, in his “Illustrated Guide to Aerodynamics”:
“actual power available for thrust is obtained by multiplying BHP times propeller efficiency”
“The [amount of power] available is the thp, which is the bhp times propeller efficiency”
Smith here is referring to
propulsive efficiency - where the plane is being
propelled. Don't use this for the stationary example.