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
Crystalline form of (R)-7-chloro-N-(quinuclidin-3-yl)benzo[b]thiophene-2-carboxamide hydrochloride monohydrate
Television receiver
Magnetic element with top shield coupled side shield lamination
Method and apparatus for displaying system status with a wide range of viewing angle
Managing a packet service call within mobile communications user equipment
Optoelectronic semiconductor chip and method for manufacturing a contact structure for such a chip
System and method for providing dynamic navigation through a property to a selected destination
  Randomly Featured Patents
Vehicle tow bar
Nano-imprint lithography templates
Lubrication structure for transmission
Method and apparatus for reading and verifying holograms
Method for manufacturing tube-shaped silica glass product
Process and device for control and monitoring a traffic control system
Fiberglass collar for data transfer from rotatable shaft
Bottle holder
Portable self-contained pneumatic lift chair
Agglomerating waste sludge and yard waste