James D Lang
Engineers at Linden Ter, Carlsbad, CA
License number
Colorado 15032
Issued Date
Aug 18, 1977
Renew Date
Apr 1, 2010
Expiration Date
Oct 31, 2013
Type
Professional Engineer
Address
Address
7409 Linden Ter, Carlsbad, CA 92011
Professional information
Reducing Runway Requirement For Aircraft
US Patent:
7997528, Aug 16, 2011
Filed:
Jan 16, 2007
Appl. No.:
11/653729
Inventors:
James D. Lang - Carlsbad CA, US
Assignee:
Aereon Corporation - Princeton NJ
International Classification:
B64C 19/00
US Classification:
244 751, 2441991
Abstract:
Runway length requirement for take-off and landing of an aircraft is reduced by taking advantage of dynamic lift overshoot, and in some cases, dynamic stall. In take-off and landing, the angle of attack is rapidly increased so that the lift coefficient exceeds the maximum predicted by the steady flow lift curve. By increasing the angle of attack at an appropriate rate, the increased lift coefficient can be maintained, without loss of control, until the aircraft touches down in the case of a landing, or until the aircraft can begin a normal climb, in the case of take-off. A low aspect ratio lifting body is preferred because of its more gradual stall behavior, and the potential to use dynamic stall for further deceleration before touchdown. Vortex fences can be oscillated to delay the onset of stall, and, in cruise, to energize the boundary-layer and reduce drag and/or control roll and/or yaw.