Resources Contact Us Home
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
System and method for enhanced artificial bandwidth expansion
Externally gapped line arrester
Manufactured product configuration
Taxi cab key chain
Pizza stone
Media processing method and device
System and method of interfacing co-processors and input/output devices via a main memory system
  Randomly Featured Patents
System and method for displaying real-time turbine corrected output and heat rate
Methods and apparatus for switching between a representative presence mode and one or more other modes in a camera-based system
Method and apparatus for producing ringing tones in a communication device
Tablet filling device
Computer readable recording medium with a wiring design program stored thereon and wiring design device
Method for fabricating a DRAM trench capacitor with recessed pillar
Capacitor for a semiconductor device and method of fabricating same
Multi-sectioned paper handling tire
Gas injection nozzle for pouring liquid metal
Bathtub drain valve control and overflow plate