Performance Optimization of the NASA Large Civil Tiltrotor
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER
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Performance optimization and analysis is presented for a Large Civil Tiltrotor LCTR2. Intended to replace regional airliners over medium ranges, LCTR2 is designed to carry 90 passengers for 1000 nm or greater, with performance of 300 knots at 28,000-ft altitude. Design features include low hover and cruise tip speeds of 650 and 350 ftsec, respectively. The paper is primarily concerned with rotor aerodynamic optimization for performance, including rotorwing interference calculations. Twist, taper, and solidity optimizations are presented, along with an analysis of flight performance in turns. Hovercruise performance tradeoffs for different cruise tip speeds are also presented. A free-wake model was used for all rotor analyses, computed by the CAMRAD II comprehensive analysis code. Aircraft design was done with the RC sizing code, developed by the U. S. Army Aeroflightdynamics Directorate.