Published online by Cambridge University Press: 28 July 2016
Much has been learnt, in many branches of science and engineering, from the use of small scale models. The earliest successful experiments in humanly contrived flight with heavier-than-air craft, were made with small scale prototypes of the man-carrying machine of a later day : experiments with man-carrying craft, kite, glider and power-driven, followed.
Note on page 575 * The N.A.C.A. 20ft. Propeller Research Tunnel with a 2,000 h.p. motor gives a speed of 110 miles/hr. in an open section 20ft. diameter and 35ft. long, whereas for the same power Mr. Wood's design should give this speed in a section 24ft. diameter and 42ft. long.