Probably propeller speed. and altitude.
Originally Posted by MentalAvenger
I'm a cynical optimist. I think the only way out is through, but once we get through it'll be better. Very different, but better. Howard Tayler
It is not the most intellectual of the species that survives; it is not the strongest that survives; but the species that survives is the one that is able best to adapt and adjust. Charles Darwin
Power, Lord Acton says, corrupts. Not always. What power always does is reveal. Robert A. Caro