oggers:
I'm asking what you believe is the measure of power available?
Power AVAILABLE (not power delivered) is very nicely defined by
KW:
In the brakes on condition we have:
Propeller power output = power being wasted in the propwash.
In flight we have:
Propeller power output = THP + power being wasted in propwash.
And I will add: The wasted propwash power is dissipated in heat (friction between air molecules in the turbulent flow).