Invention Grant
US08668162B1 Apparatus and method for roll moment equalization at high advance ratios for rotary wing aircraft
有权
用于旋转翼飞机的高提前比例的滚动力矩均衡装置和方法
- Patent Title: Apparatus and method for roll moment equalization at high advance ratios for rotary wing aircraft
- Patent Title (中): 用于旋转翼飞机的高提前比例的滚动力矩均衡装置和方法
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Application No.: US13199679Application Date: 2011-09-07
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Publication No.: US08668162B1Publication Date: 2014-03-11
- Inventor: Walter Gerd Oskar Sonneborn
- Applicant: Walter Gerd Oskar Sonneborn
- Applicant Address: US UT Salt Lake City
- Assignee: Groen Brothers Aviation, Inc.
- Current Assignee: Groen Brothers Aviation, Inc.
- Current Assignee Address: US UT Salt Lake City
- Agency: Pate Baird, PLLC
- Main IPC: B64C27/26
- IPC: B64C27/26 ; B64C27/52

Abstract:
A method for equalizing rolling moments at high advance ratios is disclosed including impelling an aircraft in a forward direction at an airspeed by means of a thrust source and rotating a rotor of the aircraft at an angular velocity with respect to the airspeed effective to cause a positive total lift on each blade due to air flow over the blades in the retreating direction when the blade is moving in the retreating direction. The rotor includes an even number of blades placed at equal angular intervals around the rotor hub. One or both of cyclic pitch and rotor angle of attack are adjusted such that a rolling moment of the retreating blade due to reverse air flow is between 0.3 and 0.7 times a rolling moment on the advancing blade due to lift.
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