71942 ⎘
Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft Propulsive discs, i.e. discs having the surface specially adapted for propulsion purposes
ELECTRIC AIR VEHICLE
#2Flying apparatus
#3Aircraft impeller and aircraft
#4Multirotor joined-wing aircraft with VTOL capabilities
#5ROTATING CIRCULAR AEROFOIL AND PROPELLER SYSTEM
#6Rotating circular aerofoil and propeller system
#7Rotating circular airfoil and propeller system
#8Closed wing