Page:Aerial Flight - Volume 1 - Aerodynamics - Frederick Lanchester - 1906.djvu/368

§ 228 are given, for front and rear aspect, in Fig. 144. It is evident that we have strong evidence here of the centrifugal shedding of the “dead-water,” the influence of which has already been the subject of comment in connection with the theory of the screw propeller.

The quantitative results of Mr. Dines' pressure reaction experiments have been given in most part in Chap. VI.

§ 229. Dines' Experiments Discussed.—The simplification resulting from the employment of the centrifugal balance in the apparatus and observations necessary for the determination of data, either of direct resistance or lateral reaction, is very great, and the apparatus in question should certainly be of further service in the future. With a modification such as suggested in § 227, it would appear possible to make determinations with very great rapidity, perhaps even with but a single revolution of the whirler. If this should become possible, one of the chief objections to an indoor whirling apparatus—the residuary motion of the air—would be done away with, and the accuracy of the results greatly increased.