Resources Contact Us Home
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
Interposer having molded low CTE dielectric
Methods and systems for managing print device supplies using cloud administration system configured for chemical signature tracking
Methods and apparatus for determining a phase error in signals
Algorithm for color corrected analog dimming in multi-color LED system
Apparatus and sensor for adjusting vertical sensor-alignment
Method and system for modularized configurable connector system for ethernet applications
  Randomly Featured Patents
Primer composition for improving the bonding of a urethane adhesive to non-porous substrates
System for designing data structures
Laser beam receivers and canal building laser devices
Drilling apparatus
Detecting method of start signal of ghost cancelling reference signal and circuit thereof
Hot dog maker
Method for forming voltage sustaining layer with opposite-doped islands for semiconductor power devices
Method to connect and distribute power to an electromechanical braking system
Oligonucleotide-polyamide conjugates