Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Rotary aircraft passively stable in hover










Image Number 3 for United States Patent #5297759.

A rotary aircraft includes a cylindrically tubular hub mounting a plurality of outwardly extending, resiliently flexible blades. The blades are uniformly spaced around the hub and its central axis and fixed in pitch. Outer tips on each of the blades are downwardly turned and outwardly turned sufficiently to balance the lift generated by the blades from air striking the aircraft horizontally when the aircraft is in hover to provide passive stability to the aircraft. A pair of propellered electric motors are mounted on a diametrically opposing pair of the blades, pitched transversely to the central axis of the hub and to a plane perpendicular to the central axis, to simultaneously provide both lift and rotation. A battery supplies all power used by the aircraft while radio control circuitry in the hub permits variation of the power supplied to the motors for altitude control of the aircraft.








 
 
  Recently Added Patents
Method and system for enabling rendering of electronic media content via a secure ad hoc network configuration utilizing a handheld wireless communication device
Dynamically updating privacy settings in a social network
Post-processing device and image forming system
Virtual image display device and manufacturing method of virtual image display device
Communication system
Alterable account number
Fuser member
  Randomly Featured Patents
Reduced delay power fail-safe circuit
Dynamic touchscreen button adjustment mechanism
Faucet handle
Manufacturing process of a MOS transistor
Submersible electric propulsion motor with propeller integrated concentrically with motor rotor
Optical demultiplexers with grating reflectors
Selective gas phase chlorination of polychlorinated .beta.-picolines to produce 2,3,5,6-tetrachloropyridine and its precursors
Heat transfer equipment and method
Layered amorphous silicon electrophotographic photosensitive member comprises BN surface layer and BN barrier layer
Method of design analysis of existing integrated circuits