jaff,

What you are trying to do throws the normal wisdom off a bit. The heavier you load the same airframe, the faster it must go to achieve the necessary lift. Therefore, you will need to experience a much longer takeoff run. Remember the drama of Lindberg's takeoff for the Paris flight.

There are formulas ( formulae) to calculate airspeed using the RPM and pitch.

You are not running out of elevator (unless the load is causing the plane to become nose-heavy), you need more airspeed before being able to lift off.

Think of the times you have been in a commercial airliner. The more empty seats, the shorter the takeoff run and vice versa.



Good luck,

Ken, AMA 19352