Forget,
"The primary characteristic of the Dean system is that it is a self-contained propulsion system not requiring the loss of mass."
Well this would also apply to a propellor or a rotor system.
The dean system while haveing a constant speed input will convert rotating mechanical horse power into a sinusoidal linear movement with equal total thrust produced in each direction. It would appear that there is a damper above the moving beam so the peak thrust in each direction may not be the same.
Nick,
Hmmmmm cribbidge hey, looking forward to poker or a ride in a minamalistic G
Jiff