BLADE INDEXING OF A ROTARY WING AIRCRAFT

Title:

BLADE INDEXING OF A ROTARY WING AIRCRAFT

Document Type and Number:

WIPO Patent Application WO/2016/054018

Kind Code:

A3

Abstract:

An aircraft is provided including an airframe, an extending tail, and a counter rotating, coaxial main rotor assembly including an upper rotor assembly with a plurality of blades rotating in a first plane and a lower rotor assembly with a plurality of blades rotating in a second plane, each of the blades having a root end, a midpoint, and a tip end. A translational thrust system positioned at the extending tail, the translational thrust system providing translational thrust to the airframe. The blades of the upper rotor assembly and the blades of the lower rotor assembly are indexed to improve tip end clearance between pairs of tip ends in the crossing plane as the tip ends move in respective first and second sinusoidal paths.

Inventors:

HUNTER DAVID H (US)
CHASEN SCOTT A (US)
CERGE BRANDON MICHAEL (US)
KOESSICK MAXIMILIAN AUGUST (US)
KOSTOSS MICHAEL J (US)
NUSSENBLATT ERIC LUCIEN (US)
THOMAS JUSTIN (US)
BUTLER CHRISTOPHER P (US)

Application Number:

PCT/US2015/052907

Publication Date:

May 12, 2016

Filing Date:

September 29, 2015

Export Citation:

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Assignee:

SIKORSKY AIRCRAFT CORP (US)

International Classes:

B64C27/10

Foreign References:

US2344967A	1944-03-28
US20140154084A1	2014-06-05
US20070084963A1	2007-04-19
US20060054737A1	2006-03-16
US2980186A	1961-04-18

Other References: