[Holtzauge]

Originally Posted by drgondog

The exhaust Thrust is a real Force to be added to Total max Thrust available at rest - minus the prop drag, the induced drag and the parasite drag

Of course exhaust thrust is a real force. Have either I or Harri said otherwize?

The exhaust thrust is added to the thrust formula according Harri's post which is SPEED dependant and should not just be added to the thrust available at rest as you claim.

I find Harri's way of calculating dividing the problem up in thrust and drag parts perfectly understandable and have seen many calculations done the same way in both technical litterature and technical papers before.

You now make a mix above of thrust, exhaust thrust, propeller drag, induced drag and parasite drag in the same sentence with no clear indications how they relate. How do we take these into account by your method? Please, show us mathematically how you intend to calculate this in a practical manner.

Originally Posted by drgondog

At the end of the day, however there is no other easy way to get 'close' other than to assume that Net Trust does indeed cancel out the Prop drag and exhaust thrust and will yield a 'close enough' approximation for parasite drag

Now on what grounds is it reasonable to assume that "Net Trust does indeed cancel out the Prop drag and exhaust thrust"? Sources please? What do you mean by "close"? Close to what and in which context?