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
Method and system for physical verification using network segment current
Mixed reactant flow-by fuel cell
Mobile communication device and method for providing positioning information
Image forming unit having agitating portion and image forming apparatus
ASICs having programmable bypass of design faults
Memory controller including a hardware compression and decompression engine for managing system memory and graphical operations
Method and apparatus for closed-loop control of anti-tachyarrhythmia pacing using hemodynamic sensor
  Randomly Featured Patents
Linear motor
Electric motor control device and drive unit
Pesticidal peptides
Sacroiliac fusion system
Energy recovery system
Container and soldering kit
Method of manufacturing glass fiber strand
Drugs and health foods
Fine particle dispersion liquid containing tantalum oxide fine particles, tantalum oxide fine particle-resin composite, and method of producing fine particle dispersion liquid
Horizontal register transfer pulse generation circuit and imaging apparatus