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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9205919 B1

PDFFull Text
Date of Patent:
Dec. 08, 2015

Filed:

Feb. 13, 2014

Apparatus and method for roll moment equalization at high advance ratios for rotary wing aircraft

Applicant:

Groen Brothers Aviation, Inc., Salt Lake City, UT (US);

Inventor:

Walter Gerd Oskar Sonneborn, Colleyville, TX (US);

Assignee:

GROEN BROTHERS AVIATION, INC., Salt Lake City, UT (US);

Attorney:

Pate Baird, PLLC

Primary Examiner:

Joseph W Sanderson

Int. Cl.
CPC ...
B64C 27/57 (2006.01); B64C 27/26 (2006.01); B64C 27/615 (2006.01); B64C 27/54 (2006.01); B64C 27/02 (2006.01); B64C 27/18 (2006.01); B64C 27/72 (2006.01);
U.S. Cl.
CPC ...
B64C 27/57 (2013.01); B64C 27/025 (2013.01); B64C 27/18 (2013.01); B64C 27/26 (2013.01); B64C 27/54 (2013.01); B64C 27/615 (2013.01); B64C 2027/7261 (2013.01);
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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Sonneborn, Walter Gerd Oskar. (2015). Apparatus and method for roll moment equalization at high advance ratios for rotary wing aircraft (U.S. Patent No. 9205919). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9205919

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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