Page:Aerial Flight - Volume 1 - Aerodynamics - Frederick Lanchester - 1906.djvu/464

 * Thrust grading, of propeller blade, §§ 206, 213
 * Torricellian principle, in its application to the field of flow, §§ 82, 138
 * Total surface, method for determination of coefficient of skin friction, § 244
 * Transverse force, consequent on cyclic motion, §§ 89, 90
 * Tree on cliff, as evidence of kinetic discontinuity, § 30
 * Turbulence, § 37


 * Up-current, induced in vicinity of a falling plane as a factor in aerodynamic support, § 110


 * Velocity gradient, in viscous motion, § 31; in skin friction, § 33
 * Velocity of flight, of greatest range and least power, § 164; of birds computed from pressure, § 187
 * Velocity of design, in its relation to velocity of least resistance, § 168
 * Velocity potential, § 60; in cyclic system, § 64; in its relation to irrotational motion, §§ 70, 71
 * Vince, experiments with normal and inclined aeroplanes, §§ 146, 222; demonstrates fallacy of sine-squared law, § 222
 * Viscosity, as a factor in causing resistance, § 1; definition of, § 31; in its relation to shear, §§ 32, 58; action of, in giving rise to turbulence, § 55; the nearly inviscid fluid, § 104; its influence as modifying the equation of least resistance, § 169; viscous resistance due to distortion of fluid in its passage through a tube of flow, § 32
 * Vortex atom theory, § 93, App. II.
 * Vortex filaments, trailing from extremities of aerofoil, §§ 125, 126, 127; attached to blade of screw propeller, § 217; generation of, by aerofoil, §§ 117, 126, 189, 190
 * Vortex hoop, sustaining a load in flight, § 125
 * Vortex motion, a case of, § 72; brief exposition of, § 93; filaments and rings, § 93; compound systems, § 93


 * Wake and counterwake, momenta equal and opposite, § 22
 * Weight, as affected by aerofoil area, § 170; relative importance of wing or aerofoil weight, § 196, App. IV.; of aerofoil as affecting conditions of least resistance, §§ 171, 194, 195
 * Whirling table, the, § 221; invented by Robins, §§ 129, 221; used by Langley, § 230
 * Wing area, or sail area, equivalent area, measurement of, §§ 192, 193
 * Wing form, arched section, §§ 107, 108, 118; section deduced from theory, § 124; plan form, §§ 119, 120