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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 10640203 B1

PDFFull Text
Date of Patent:
May. 05, 2020

Filed:

Oct. 01, 2015

Rotorcraft rotor and propeller speed

Applicant:

Sikorsky Aircraft Corporation, Stratford, CT (US);

Inventors:

William J. Eadie, Cheshire, CT (US);

Patrick Boyle, New Haven, CT (US);

Assignee:

SIKORSKY AIRCRAFT CORPORATION, Stratford, CT (US);

Attorney:

Cantor Colburn LLP

Primary Examiner:

Richard G Davis

Int. Cl.
CPC ...
B64C 27/10 (2006.01); F16F 15/02 (2006.01); B64C 27/00 (2006.01); B64C 27/14 (2006.01); B64C 1/00 (2006.01); B64C 7/00 (2006.01); B64C 13/18 (2006.01); B64C 13/50 (2006.01); B64C 19/00 (2006.01); B64C 27/12 (2006.01); B64C 27/16 (2006.01); B64C 27/32 (2006.01); B64C 27/33 (2006.01); B64C 27/473 (2006.01); B64C 27/48 (2006.01); B64C 27/51 (2006.01); B64C 27/52 (2006.01); B64C 27/54 (2006.01); B64C 27/78 (2006.01); B64C 27/80 (2006.01); B64C 27/82 (2006.01); B64D 39/00 (2006.01); B64D 39/06 (2006.01); B64D 45/02 (2006.01); F16H 37/02 (2006.01); G05D 1/00 (2006.01); G05D 1/02 (2020.01); B64C 13/04 (2006.01); G05D 1/08 (2006.01); B64C 27/57 (2006.01); B64D 35/06 (2006.01); B64C 27/467 (2006.01); B64C 27/08 (2006.01); F02C 9/28 (2006.01); F16D 13/52 (2006.01); F16D 13/72 (2006.01); F16D 13/74 (2006.01);
U.S. Cl.
CPC ...
B64C 27/10 (2013.01); B64C 1/0009 (2013.01); B64C 7/00 (2013.01); B64C 13/04 (2013.01); B64C 13/18 (2013.01); B64C 13/50 (2013.01); B64C 13/503 (2013.01); B64C 19/00 (2013.01); B64C 27/001 (2013.01); B64C 27/006 (2013.01); B64C 27/008 (2013.01); B64C 27/12 (2013.01); B64C 27/14 (2013.01); B64C 27/16 (2013.01); B64C 27/32 (2013.01); B64C 27/322 (2013.01); B64C 27/33 (2013.01); B64C 27/467 (2013.01); B64C 27/473 (2013.01); B64C 27/48 (2013.01); B64C 27/51 (2013.01); B64C 27/52 (2013.01); B64C 27/54 (2013.01); B64C 27/57 (2013.01); B64C 27/78 (2013.01); B64C 27/80 (2013.01); B64C 27/82 (2013.01); B64D 35/06 (2013.01); B64D 39/00 (2013.01); B64D 39/06 (2013.01); B64D 45/02 (2013.01); F16F 15/02 (2013.01); F16H 37/02 (2013.01); G05D 1/0077 (2013.01); G05D 1/0202 (2013.01); G05D 1/0816 (2013.01); G05D 1/0858 (2013.01); B64C 27/08 (2013.01); B64C 2027/004 (2013.01); B64C 2027/8209 (2013.01); B64C 2027/8227 (2013.01); B64C 2027/8236 (2013.01); B64C 2027/8263 (2013.01); B64C 2027/8272 (2013.01); B64C 2027/8281 (2013.01); B64C 2201/024 (2013.01); F02C 9/28 (2013.01); F05D 2220/329 (2013.01); F05D 2270/021 (2013.01); F16D 13/52 (2013.01); F16D 13/72 (2013.01); F16D 13/74 (2013.01); G05D 1/0204 (2013.01); G05D 1/08 (2013.01);
Abstract

An aircraft includes an airframe having an extending tail, a counter rotating, coaxial main rotor assembly disposed at the airframe including an upper rotor assembly and a lower rotor assembly, and a translational thrust system positioned at the extending tail and providing translational thrust to the airframe, the translational thrust system including a propeller. A gearbox system is operably connected to the main rotor assembly and the propeller to drive rotation of the main rotor assembly and the propeller. The gearbox is configured to maintain a main rotor assembly tip speed below Mach 0.9 and a propeller helical tip speed below Mach 0.88.

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