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1. (WO2016053859) HUB SEPARATION IN DUAL ROTOR ROTARY WING AIRCRAFT

Pub. No.:    WO/2016/053859    International Application No.:    PCT/US2015/052619
Publication Date: Fri Apr 08 01:59:59 CEST 2016 International Filing Date: Tue Sep 29 01:59:59 CEST 2015
IPC: B64C 27/04
Applicants: SIKORSKY AIRCRAFT CORPORATION
Inventors: WEINER, Steven D.
BRIGLEY, Mikel
HUNTER, David H.
Title: HUB SEPARATION IN DUAL ROTOR ROTARY WING AIRCRAFT
Abstract:
An aircraft includes an airframe; an extending tail; a counter rotating, coaxial main rotor assembly including an upper rotor assembly and a lower rotor assembly; and a translational thrust system positioned at the extending tail, the translational thrust system providing translational thrust to the airframe; wherein a ratio of (i) the hub separation between the hub of the upper rotor assembly and the hub of the lower rotor assembly to (ii) a radius of the upper rotor assembly is between about 0.1 and about 0.135.