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
Secure Flash-based memory system with fast wipe feature
Filler containing composition and process for production and use thereof
Range extension techniques for a wireless local area network
Method for fabricating solar cell
Method and apparatus for controlling the use of data stored on a media sample
Nucleic acids for cloning and expressing multiprotein complexes
Accessing device via communication protocol selection
  Randomly Featured Patents
Zoom lens, camera device and personal digital assistant
Efficient support of consistent cyclic search with read-copy-update
Reinforced backplane for high density electrical contacts
Ceiling fan
Walking beam drive apparatus
One-touch doorlock device with function of outputting speech message
Television monitor
Piperazine and piperidine compounds
Exercise device with audible electronic monitor
Electromechanical needle bar engaging device