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Technology Assessment for Large Vertical-Lift Transport TiltrotorsThe technical community has identified rotor efficiency as a critical enabling technology for large vertical-lift transport (LVLT) rotorcraft. The size and performance of LVLT aircraft will be far beyond current aircraft capabilities, enabling a transformational change in cargo transport effectiveness. Two candidate approaches for achieving high efficiency were considered for LVLT applications: a variable-diameter tiltrotor (VDTR) and a variable-speed tiltrotor (VSTR); the former utilizes variable-rotor geometry and the latter utilizes variable-rotor speed. Conceptual aircraft designs were synthesized for the VDTR and VSTR and compared to a conventional tiltrotor (CTR). The aircraft were optimized to a common objective function and bounded by a set of physical- and requirements-driven constraints. The resulting aircraft were compared for weight, size, performance, handling qualities, and other attributes. These comparisons established a measure of the relative merits of the variable-diameter and -speed rotor systems as enabling technologies for LVLT capability.
Document ID
20110008354
Document Type
Contractor Report (CR)
Authors
Germanowski, Peter J. (Sikorsky Aircraft Stratford, CT, United States)
Stille, Brandon L. (Sikorsky Aircraft Stratford, CT, United States)
Strauss, Michael P. (Sikorsky Aircraft Stratford, CT, United States)
Date Acquired
August 25, 2013
Publication Date
May 1, 2010
Subject Category
Aeronautics (General)
Report/Patent Number
NASA/CR-2010-216384
ARC-E-DAA-TN1427
Distribution Limits
Public
Copyright
Public Use Permitted.

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