Keith Williams:
If you look at item number 2 above you will see that:
Page 1 post 14 “But that does not mean a stationary aircraft can do no work and therefore produce no THP!!! The work is done by moving the mass of air one way and the mass of the Earth a tiny imperceptible amount the other way. “
implies that
When an aeroplane is standing still on the ground with wheel brakes applied the THP is equal to Thrust x propwash velocity.
Actually it doesn’t imply that. From the essay again:
It's pretty well known that at the propeller, the air has accelerated one half of what it will do downstream (VI = 1/2 ΔV). So, at the propeller, the velocity is VA + 1/2 ΔV.
…which is a basic tenet of the fluid dynamics here. Vi is half ΔV. Those for whom this is not ‘pretty well known’ are liable to draw the wrong conclusion – as you have above. Yes, I say induced power is equivalent to THP but that wouldn’t make it “equal to Thrust x propwash velocity”. Statically it is T x Vi as I stated in a previous post.