quadrirotor,
"Synchropter is ideal to autorotate after a power shut down as the nose goes down when there is no torque at the rotors!"
True. This rotation about the craft's lateral axis is due to the angle of the masts off the vertical and the breaststroke (inside forward) rotation of the rotors. Kaman may have found it a little 'too' ideal.
On an early model of the Huskie they directed the exhaust downward in an apparent attempt to reduce this pitching on the loss of power.
This is one of a number of reasons for increasing the rigidity of intermeshing rotors. Rigid rotors will allow for a reduction in the angle between the two masts and this reduces the pitch component of the torque of the main rotors.
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zeeoo,
The reason for questioning your project is that I believe your 'gyrocopter' will not be marketable in the US Sport plane/pilot category, should you desire to do so. A collective control, for a jump takeoff, or helicopter style cyclic control, which is necessary for a rotor with more than two blades, will not be accepted.
Dave
Editied to remove the idiotic comments on electric rotorcraft.