Electric fan having two wind shifting modes
Energy converter
Eolic converter
Fan assembly having protective motor housing that...
Fan head swinging device
Fan oscillating in two axes
Fan structure having a spherical four-bar mechanism
Flapping restrainer device for rotorcraft rotor blades, and roto
Flexbeam damper assembly having transition shim clamp device
Flexible swashplate centering member
Flip-flop turbine vane module
Fluid current motor
Fluid current motor
Fluid flow energy conversion apparatus
Fluid inertia drag damper for rotary wing aircraft rotor
Fluid motor apparatus for amplifying thrust
Gyrocraft rotor hub body
Gyroplane rotor with double-plate hub and external pitch...
Helicopter
Helicopter blade assembly adapted to permit rapid forward flight