"Gord Beaman" wrote in message
...
"Dudley Henriques" wrote:


"Are you trying to tell me that the
rotational (energy) of a propeller is
the same at 15 inches as it is at 61?"



If he was he was right, the rotational energy
is simply a product of angular velocity and mass
and is the same in coarse pitch, fine pitch or a vacuum.

The power being delivered is a different matter of course
and depends on factors such as propellor pitch, air
density and of course angular velocity.

Keith