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App. VIIIb.
Appendix
§ 107 and suppose that each element of the area of the boomerang experiences a reaction proportional to the square of its velocity, we shall have the centre of pressure displaced as
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Fig. 191.
represented diagrammatically in Fig. 193 (a). In this figure it is evident that the motion of the boomerang viewed from above being counter-clock, the centre of pressure is displaced to the
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Fig. 192. Fig. 193.
right, and the resulting torque, from the point of view of the thrower, is counter-clock. Consequently the angular momentum imparted to the boomerang about the axis of flight will also be counter-clock, and owing to the rotation it will be angular momentum of aspect; it is therefore the upper face of the
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