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
Radiation protective garment with forced ventilation and method
Expression of dirigent gene EG261 and its orthologs and paralogs enhances pathogen resistance in plants
Millimeter wave imaging method and system to detect concealed objects
Position pointer, variable capacitor and inputting apparatus
Method for selective deposition of a semiconductor material
Fabric care compositions comprising front-end stability agents
Cooling method and device for cooling a medium-voltage electrical installation in a protective sheath
  Randomly Featured Patents
Sunroof assembly noise attenuation system
Athlete's neck and spine safety brace
Switchboard having a dual switching system
Apparatus and method for reading two-dimensional symbols
Adjustable pitch garden hoe tool
Actuating device
Light emitting diode
Simultaneous multiple rotation interface
Non-privileged access to data independent of filesystem implementation