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
Plasma doping method and plasma doping apparatus
System and method for removing oxide from a sensor clip assembly
Method of predicting a motion vector for a current block in a current picture
DC/DC converter, power supply circuit, and semiconductor device
Mass spectrometry method
Light-reflective anisotropic conductive paste and light-emitting device
Wireless refrigerant scale platform
  Randomly Featured Patents
Masking device for a cinema screen
Frequency control, and sensing circuit
Method and apparatus for inspecting high speed converted web
Guide tube for a nuclear fuel assembly
System and method for detection and display of diseases and abnormalities using confidence imaging
Front panel portion of a paper feed cassette
Ink-jet recording apparatus
Preparation of alkoxy methyl ethers
Circuit for determining the remaining operating life of a system
Manufacturing method of electrode catalyst layer for fuel cell