NASA Technical Translation, Issue 823National Aeronautics and Space Administration, 1959 - Science |
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Common terms and phrases
according to Eq aerodynamic airfoil angles of attack assumed average azimuth angle Biot-Savart law blade section calculations circulation coaxial collective pitch component computed coordinates corresponding curve determined distribution elements elliptic integrals equation Figure flapping motion flow following form formula Fourier series free vortices front rotor function given by Eq graphs harmonics helicopter helicopter rotor induced velocities influence integral in Eq Joukowsky lateral vortices lift coefficient lifting airscrew lifting line lifting surface linear nondimensional number of blades obtain parameter pitch angle plane of rotation polynomial propeller quantities radius rear rotor regime of flight relationship respect rotor disc segment shown in Fig substitute Eq tail rotor taking into consideration thrust tion tip vortices TSAGI values vector velocities induced velocity potential vortex ring vortex system vortex theory vortex wake X₁ y₁ zero Απ Ст