Magnetically actuated amusement device
Main helicopter rotor
Main helicopter rotor
Main helicopter rotor
Main rotor for a helicopter
Main rotor shear restraint
Marine propeller and hub assembly
Marine propeller with tube shape shock absorbing means
Marine propellers
Matched stiffness rotor flexbeam and blade system
Method and apparatus for aeration using flexible blade impeller
Method of and apparatus for increasing propulsive efficiency of
Mid-beam jointed reconfigurable bearingless main rotor assembly
Modified savonius rotor
Monodirectional impeller with flexible vanes
Monolithic structure having improved flaw tolerance
Multi-blade propellers
Multi-blade rotor for a helicopter