Note 19 — Chapter IV · EARLY STEAM MOTORS AND OTHER MODELS
Reading edition
The following table taken from “Experiments in Aerodynamics,” p. 107, gives the data for soaring of 30 × 4.8 inch planes, weight 500 grammes.
Angle with horizon α. Soaring speed V. Work expended per minute. Weight with planes of like form that 1 horse-power will drive through the air at velocity V.
Metres per second. Feet per second. Kilogram-metres. Foot-pounds. Kilogrammes. Pounds.
45° 11.2 36.7 336 2,434 6.8 15
30 10.6 34.8 175 1,268 13.0 29
15 11.2 36.7 86 623 26.5 58
10 12.4 40.7 65 474 34.8 77
5 15.2 49.8 41 297 55.5 122
2 20.0 65.6 24 174 95.0 209
The relations shown in the above table hold true only in case of planes supporting about 1.1 pounds to each square foot of sustaining area. For a different proportion of area to weight, other conditions would obtain.