Propulsive Effects of a Rotating Mass 



0.085 m/sec. K this hull were extended 

 proportionally, to the length of 160 me- 

 ters, it would be able to reach a speed 

 V =v(\)i/2 = 0.085/0. 514 X (160/4)1/2 = 



1.04 knots. The device would occupy 

 5/100 X 160 = 8 meters of the length of 

 the hull, and 2% of the displacement. 

 The hull of Fig. 17, on the other hand, 

 if leng'^hened to 160 meters would be 

 able tc reach a speed v = 0.36/ 

 0.514(40) ^'2 = 4^45 knots. The device 

 would occupy 8/100 x 160 = 12.8 meters 

 of the length of the hull, but 12.7% of 

 the displacement. 



Figure 18 shows the hull indi- 

 cated in Fig. 17 tested in the port of 

 Genoa. The wave produced by the lat- 

 eral displacements of the hull is quite 

 visible. 



Figure 19 shows a very light hull, 

 1.40 meters long, with a flat bottom, 

 driven by a device with two masses. 

 The hull can advance in any direction. 

 It completes a rotation of 360° in 30 

 seconds. 



Indicated in Fig. 20 is a model 

 destroyerwith 2pj/d = 0.062 and 2r/L = 

 0.039. In a surface of water of 10.5 

 square meters, it turns in a short time. 



Figure 21 shows a long device hav- 

 ing R = r = 0.80 meters. It will be 

 tested in the sea as soon as a suitable 

 small ship is found. In such a way we 

 hope to see what can be achieved on a 

 ship in normal navigation on the open 

 sea. 



Fig. 15 - Trunk of a Fiat 

 1100 with a device consist- 

 ing of two masses at 6 kg 

 each and having the same 

 effect on the back part of the 

 car, after being set in mo- 

 tion, as the device in Fig. 14 



Fig. 16 - Device with hyp- 

 popedes on forward part of 

 a ship model 1.60 meters 

 long, 1 5 kg weight, advanc- 

 ing at low speed and having 

 rectilinear motion 



It should be pointed out that very 

 little force is needed to move afloat on 

 an absolutely calm surface of water. 

 For example, the model of the de- 

 stroyer indicated in Fig. 20, which weighs 24 kg can be moved by applying a force 

 of 1 gram to it. Since, as we have seen, the tested device has the capacity to 

 move a float, it follows from this that the device generates a propulsive effect 

 even when the resistance is very low. 



1385 



