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
Compression molding method and reinforced thermoplastic parts molded thereby
Fuel cell and a method of manufacturing a fuel cell
Replacing memory pointers with implicit pointers to be used in compiler-generated debug output
Sealed, waterproof digital electronic camera system and method of fabricating same
Systems and methods for parameter adaptation
Methods, devices and software applications for facilitating a development of a computer program
Sublingual coated tablet of fentanyl
  Randomly Featured Patents
Tracing and identifying piracy in wireless digital rights management system
Method and apparatus for assembling and forwarding sets of sheets
Brake for paper roll bearing shaft in paper roll support frame of web feeder for rotary press
Flow measurement devices having constant relative geometries
Casting sinker
Frequency dividing circuit
Apparatus for selective separation of matter through semi-permeable membranes
Dot print density regulating circuit
Hard surfacing for a centrifuge conveyor