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
Load balancing in shortest-path-bridging networks
Under bump passive components in wafer level packaging
Tranverse in-core probe monitoring and calibration device for nuclear power plants, and method thereof
Apparatus and method for controlling semiconductor die warpage
Clock distribution circuit
DKK1 oncogene as therapeutic target for cancer and a diagnosing marker
Grid computing accounting and statistics management system
  Randomly Featured Patents
Fuel injector control incorporating fuel vaporization parameters
Chemical composition that attract arthropods
Biometric apparatus with automatic zero-point reset function
System which alternates between displaying and capturing images
Radiator grill for automobile
Method for compressing data
Handle for control of an agricultural vehicle
Method for manufacturing particles for use in forming a resorbable implant for stimulating bone growth
Large-aperture, ultra wide angle photographic lens system
Crystalline salts of 7-[4-(4-fluorophenyl)-6-isopropyl-2-[methyl(methylsulfonyl)amino]pyrimidin -5-yl]-(3r,5s)-3,5-dihydroxyhept-6-enoic acid