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
Method of manufacturing acrylic film, and acrylic film
Method and apparatus for prioritizing data transfer
Center spreader adapter tool for toilet paper rolls and paper towel rolls that do not have inner cardboard tubes
Method and apparatus for organizing segments of media assets and determining relevance of segments to a query
Method and apparatus for an active low power mode of a portable computing device
Method and system for acquiring support capability of mobile terminal by base station side system
  Randomly Featured Patents
Use of thickened oil for sand control processes
Optical recording medium, method for recording/reproducing the optical
Methoxypolyethylene glycol thioester chelate and uses thereof
Apparatus and methods for sensing and clamping discs
Process and apparatus for forming a minimal headspace pouch
Apparatus, system, and method for determining the degradation of an SCR catalyst
Method and apparatus for broadband optical end point determination for in-situ film thickness measurement
Press body
Multi-layer core golf ball
Illuminating device for a vehicle for realizing an asymmetrical light distribution