Stability and control handbook for helicopters
E. Kisielowski, A. A. Perlmutter, J. Tang, Dynasciences Corporation, U.S. Army Aviation Materiel Laboratories
U.S. Army Aviation Materiel Laboratories, 1967 - Transportation - 534 pages
Analytical methods are presented for determining the dynamic stability and control characteristics of generalized procedures which are considerably simplified through the extensive use of information presented in graphs and charts. These charts are applicable to flight conditions from hover to high forward speeds. The charts for low forward speeds were obtained from the rotor performance data based on classical rotor theory. However, the high-speed charts exclude the major assumptions of classical theory and include blade compressibility, stall, reverse flow, large inflow ratios, etc. The handbook contains information suitable for extensive digital and analog computer studies and also provides rapid procedures for predicting helicopter stability and control characteristics for preliminary design applications. (Author).
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aA,F aB,F aBlR aerodynamic aFUS aircraft components analog computer angle of attack blade twist Calculated Characteristics characteristic equation Cmfus coefficients collective pitch constant values control inputs cyclic pitch daFUS data of Reference daTR db,F DFUS dMHUBR downwash drag coefficients duFUS equations of motion Figure forces front and rear front rotor ft/sec fuselage HUBF HUBR inertia isolated rotor derivative lb-sec/ft lb/rad longitudinal cyclic main rotor obtained from Reference perturbation pi pi presented in Section rear rotor Report ROTOR ANGLE rotor heli rotor performance data rotor solidity sample tandem rotor single rotor helicopter Stability and Control stability augmentation system STABILITY METHOD step Subsection tail rotor tandem rotor configuration tandem rotor helicopters tip speed ratio total stability derivatives trim conditions trim values U. S. Army utilized velocity Y-force yawing