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
Technique for enabling a plurality of software components to communicate in a software component matrix environment
Method for multiplexing control signals in a mobile communication system
Image forming device generating screens for remote and local access, information processing method, and computer-readable recording medium
Aqueous compositions useful in filling and conveying of beverage bottles wherein the compositions comprise hardness ions and have improved compatibility with PET
Adjustable forehead support dial for respiratory mask
Home appliance, home appliance system, and diagnosis method of a home appliance
Closed-loop torque phase control for shifting automatic transmission gear ratios based on friction element load estimation
  Randomly Featured Patents
Manufacturing method of a perpendicular recording magnetic head
Device for manufacturing injection moulding pieces with turret having holders
Pen mouse
Terahertz beam scanning apparatus and method thereof
Two-zone hot air oven for food-loaded cartridges
Automatic revitalization of sulfide processing and treatment solutions
Device and control structure of multi-level pulse width modulation
Automatic rotating media stripper carriage for a printer and method for maintaining a printer
Amphoteric compostion and polymeric forms of alpha hydroxyacids, and their therapeutic use
Hose coupling