Originally Posted by
Jimmy.
Just asking (I really don't know): there is a linear relation between torque and thrust? Beside the direct physics and math involved, one idea occured to me: some torque is used to drive the powertrain and as it is increased part of this extra torque is used to drive the TR, so things seems to be a little more complex.
In my overly simplified analysis, I use 75% torque for hover power. That value would also include the power to drive tail rotor, accessories and other losses. My guess is flat pitch torque would be roughly 15%. For simplification, I make the assumption its linear, however, it’s certainly not linear from 0. Also, flat pitch doesn’t necessarily imply 0 degree angle of attack, especially considering blade twist.