missing something.
the centre of mass of the aircraft is above the thrust line.
if you are flying along in trimmed equilibrium all the force couples balance.
if you then increase the rpm the propeller thrust increases. you now have an additional amount of force acting through the arm to the Centre of mass.
nose goes up until the force couples balance again.
the opposite occurs if you decrease thrust from a trimmed equilibrium.
in a high engine aircraft like the Lake LA4 amphibian the thrust line is above the centre of mass and increased prop thrust pushes the nose down.
Last edited by dubbleyew eight; 30th Sep 2013 at 13:57.