3 ms·Symmetry would ruin the self-stabilizing autogyro descent on unexpected power down.by usrusr 5y agoSymmetry would ruin the self-stabilizing autogyro descent on unexpected power down.Kaibeezy 5y agoWould it? Aren’t most autogyros 2-blade? Multi-blade helicopters also use autorotation for emergency landings.usrusr 5y agoHelicopter autogyro requires deliberate control input. This one enters self-stabilizing autogyro when control input stops at any given operational state.