italia you are still waffling. I know what thrust, power and torque are. Before becoming a pilot I was a transmission design engineer.
I have made two simple points: the first was that the [3 now!] posters who have said exactly what Harold did at #20 are unlikely to be talking about the inertia thing you assumed.
The second point is that you are wrong with this:
“Yes a stationary aircraft [producing 200 BHP] is doing zero work and it is producing no THP! I'm usually pretty careful to not state flat out that I know I'm correct but in this case I think I could come out and say that. I'm not going to continue to argue if it's true or not but if you would like to understand it, I have no problem going into detail and explaining it.”
….yes please do explain how you think this is the case because the standard blurb about power required and power available to maintain level flight don't apply to an aircraft being used as a big stationary fan on the ground. But that doesn't mean a fan has no thrust and no thrust horsepower.
if the aircraft isn't moving, it isn't covering distance and so the work = zero.
Do you believe a helicopter in a hover is producing any thrust horsepower? Or if the helo is 'wheels light': any THP?