In the experiments, use was made of the arrangement shown in Fig. 1. The aerofoil had the wing section No. 436, with a span of 960 mm., and a chord of 160 mm. The propeller had diameter of 265 mm., and was mounted on the end of an adjustable shaft, which in turn was mounted on a floating frame, and was driven, by means of a belt, by an electric motor located outside the air current.
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