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 and system for generating and displaying an interactive dynamic selective view of multiply connected objects
Method and system for electronic distribution of product redemption coupons
Measurement of an analyte on the skin using a hue angle
VEGF-specific capture agents, compositions, and methods of using and making
ESD protection circuit and ESD protection device thereof
Adaptive flow for thermal cooling of devices
Method of bonding metallic members, and metallic bonded body
  Randomly Featured Patents
Mask making decision for manufacturing (DFM) on mask quality control
Suppression of nuclear factor-.kappa.B dependent processes using oligonucleotides
Storage system
Strand-separation arrangement and a method for separating the strands of a multi-conductor electrical cable
Apparatus and method for interleaving timed program data with secondary data
Delimbing attachment for tree harvesting apparatus
Method of manufacturing mono-layer capacitors
Multi-conduit, multi-nozzle fluid distributor
Flat-panel display apparatus and its control method
Foldable dual-chair