Resources Contact Us Home
Vorticity cancellation at trailing edge for induced drag elimination

Image Number 4 for United States Patent #7134631.

Wing tip vortices are evident from airliner vapor trails, and helicopter blade slap. Elliptically loaded high aspect ratio tapered wings have minimum induced drag but cannot eliminate it. Different methods are disclosed herein, for upper and lower surface boundary layers to cancel their opposing vorticity upon shedding from the trailing edge, thereby eliminating wake vorticty, induced drag and associated noise. This requires wing-rotor-propeller or fan blades with a platform designed for uniform bound circulation and with boundary layer control near the tip. In addition this requires special techniques to counter span-wise pressure gradients, such as tip circulation control blowing or an upwind small propeller or wind turbine on each tip. These techniques can eliminate wake vorticity with its induced drag, noise, flying on the backside of the power curve and the option for asymmetric loading by pneumatic means to eliminate need for cyclic pitch control or conventional ailerons.

  Recently Added Patents
Clothing fastener accessory
Powder pulverising device
Method and apparatus for internet on-line insurance policy service
Determination of copy number variations using binomial probability calculations
Electric discharge machining hole drilling
Chair structure
Vertical axis wind turbines
  Randomly Featured Patents
Method for wet flue gas desulfurization and device for implementing said method
Paint atomizer bell with ionization ring
Trailer hitch alignment mechanism
Motion verifying camera and motion verifying photography method
Magnetic systems for long scale electrical meter with multiple side coil sensing
Mower blade
Synchronizing hydraulic cylinders
System and method for maintaining proper device operation at battery depletion by self-regulating current drain usage