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Static stability, 193
Swash plate, 17
Swirl velocity, 44
Tailplane:
effect on control response, 187
effect on dynamic stability, 164
effect on gust response, 190
effect on longitudinal trim, 123
Tailrotor loss in forward flight, 128
Theodorsen’s wake theory, 67
Thrust:
coefficient:
definition, 48
forward flight, 96
hovering flight, 47
definition, 27
equations:
forward flight, 97
hovering, 48
effect on high incidence on, 225
Tip loss factor, 65
Tip shapes, 223
Tip vortex, 70
Torque coefficient, 50
forward flight, 102
vertical flight, 50
Turbulent wake state, 43
Velocity components at blade, 92–96
Vibration:
active control of vibration, 310–314
active control of structural response
(ACSR), 312
higher harmonic control (HHC), 310
dynamic design of rotor blades, 294
exciting forces, 291
frequencies other than hΩ, 314
fuselage response, 301
main rotor gearbox mounting systems, 297
DAVI mounting system, 298
measurement in flight, 316
vibration absorbers, 304
battery, 309
bifilar, 305
Flexispring, 307
pendulum, 307
Vortex ring state, 42
Vortex wake:
forward flight, 196–221
prescribed wake, 202–216
free wake, 216–221
hovering flight, 59–75
rigid wake, 59–69
prescribed wake, 69–74
free wake analysis, 74–75
Vortices
shed, 196
trailing, 196
Weaving, blade, 332
Wind axes, 365
Windmill brake state, 42
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Bramwell’s Helicopter Dynamics(184)
