Economic Evaluation of Flying-qualities Design Criteria for a Transport Configured with Relaxed Static StabilityNASA, 1980 - 30 pages |
Common terms and phrases
4.2 percent airfoil aspect ratio baseline configuration block hour center of gravity configured with relaxed constraint functions control system cost per block cost with respect damping ratios design constants design of transport direct operating cost double amplitude downwash drag estimated feedback gain flight control flying-qualities criteria flying-qualities design criteria fuel cost handling qualities horizontal-tail impact independent design variables iteration landing field length landing gear Langley Research Center LEVEL I LEVEL lift coefficient longitudinal longitudinal-flying-qualities margina maximum CL/CD meters modified direct operating nearly 1 percent negative maneuver margin Nonlinear programming OPDOT parameter percent savings Phugoid pitching moment reduction references 17 relaxed static stability relaxed-static-stability augmentation systems savings in direct SAVINGS IN MDOC savings in modified Second-segment climb gradient short-period frequency shown in figure static margin Supercritical airfoil take-off weight time-to-double transports configured trimmed U.S. dollars unaugmented flying qualities unaugmented transports unstable airplanes utilized wing