Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Control of an electric machine
Method and apparatus of motion vector prediction with extended motion vector predictor
Video stabilization
Bitter taste receptors
Power supply system for motor vehicle
Apparatus for electrographic printing or copying
Tint block image generation program and tint block image generation device
  Randomly Featured Patents
System and method for constructing clustered dictionary for speech and text recognition
Production of color proofs and printing plates
Reset circuit for an automobile antenna control device
Method of forming a defect-free semiconductor layer on insulator
Cooling fan isolation mount
Assay device processing apparatus and method
Method and apparatus for supporting a network initiated handover in a wireless network
Retainer scheme for cutting tool
Method and system for cancellation of ambient light using light frequency
Reading apparatus