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
Bamboo scrimber and manufacturing method thereof
Technology for managing traffic via dual homed connections in communication networks
Data scrambling in memory devices
Power supply device
Integrated touch screen
Anti-infective derivatives, method for the production thereof, pharmaceutical compositions containing same and uses of said derivatives in treatment
Closed cell culture system
  Randomly Featured Patents
Scarf
High uniformity foam forming
Apparatus for loading elongated workpieces
System restore apparatus and method employing virtual restore disk
Tension controlled seat belt retractor
Dual chamber drinking cup
Assembly consisting of a brake booster and of a master cylinder
Pneumatic-spring percussion mechanism with a variable rotary drive
Systems and methods for determining user actions
Photopolymerizable biodegradable hydrogels as tissue contacting materials and controlled-release carriers