Title:
IMPROVED WING EFFICIENCY FOR TILT-ROTOR AIRCRAFT
Document Type and Number:
WIPO Patent Application WO2008085195
Kind Code:
B1
Abstract:
Rotorcraft wings disposed between tilt-rotor nacelles have particularly high aspect ratios for tilt-rotor rotorcraft, including for example at least 6, 7, 8, or higher. The increase in wing span and aspect ratio is possible because of the use of rigid and semi-rigid rotors, and/or higher modulus of elasticity materials allows increases the stiffness of the wings to the level required for avoiding whirl flutter. Tilt-rotor aircraft having high aspect ratio wings can advantageously further include a controller that provides reduced RPM in a forward flight relative to hover, and/or a controller that provides variable speed, (a so-called "Optimum Speed Tilt Rotor") as set forth in US 6,641,365 to Karem (Nov. 2003).
Inventors:
KAREM ABE (US)
Application Number:
PCT/US2007/018003
Publication Date:
December 04, 2008
Filing Date:
August 13, 2007
Export Citation:
Assignee:
KAREM ABE (US)
International Classes:
B64C29/00
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