Gyromike,
Is there any advantage in autogyro of a 3-blade articulated or even rigid head rotor? This would get around many of the reduced-g control loss problems, and elastomeric bushes are widely available (ie cheap lead/lag hinges possible). I remember being told about an ex-Westlands guy doing some work at Bristol uni - but it may have only ever remained theory...
I'm also puzzled why a teetering gyro seems easier to fly than say an R22. Is this just due to the direct control system, or does less rotor mass help? I'm a fan of the '60s Lockheed gyro system, but am now wondering if there is some inherent advantage to being in permanent autorotation...
Mart