Quote:
Originally Posted by Keef256
Just had another thought the other thing that will affect things is the rotor. As you climb the air beromes thinner (less pressure) so there is less drag on the rotor. Therefore the power required to keep it at the same rpm is less. Therefore MP will drop as you climb (assuming you keep the colective in the same place). The reverse is also true. As you decend the air gets thicker (more resistance) and so more power required so more MP required.
Originally Posted by Flingwing207
Er - I'm pretty sure that's what I said...
Not the way i read it you talked about the exaust pressure being lower which will create more power which means engine rpm will increase. Therefore smaller butterfly opening and lower MP.
I was sugesting that the drag on the rotor would decrease as the air gets thinner causing a rise in engine rpm. Therefore smaller butterfly opening and lower MP.
Same result different cause.