Jeff Spitzer wrote:

The idea posted previously to drive the prop directly from the rotor is
totally without merit.  The problem is that the rotor HAS NO TORQUE!  The
torque is created by the eccentricity of the shaft and the pressure on the
rotor.  The great thing about this is that the only loads which actually go
through the stationary gear on a 13B are those required to accel/decel the
rotation of the rotor to stay in phase with the crank.  If the output could
be connected to the rotor then ALL THE TORQUE WOULD GO THROUGH THE ROTOR
GEARS.  And hence, the goal of eliminating the PSRU would be defeated by
the need to beef the stationary gear and rotor gear accordingly. This is
not even practical.

Jeff Spitzer

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