Propulsive Effects of a Rotating Mass 



6. We did not rvin any tests of devices placed on hulls in motion to see 



if a device produces its forward motion even when the hull has the propeller in 

 action, or if it produces its turning motion even when the hull has the propeller 

 alone or the propeller and the rudder in action. These are tests that would be 

 of great interest for the practical application of the device. K the outcome of 

 the tests were satisfactory, the use of the device could become useful even if 

 just for the contribution it would make in support of the rudder. These tests 

 should be carried out, naturally, on a ship under normal navigation conditions. 



7. It was not possible for us to conduct research on trajectories different 

 from those indicated previously; for example, trajectories that are less cum- 

 bersome and more efficient. 



Having seen from the first that, even with determined limitations, there 

 existed the possibility of moving a vehicle in a desired direction, by making a 

 mass rotate within it, we dedicated ourselves solely to the execution of a vast 

 series of tests with the goal of giving a definite proof of the existence of this 

 possibility. ■ - ■• 



We are of the conviction that what is of interest is mainly the construction 

 of evidence for a given phenomenon. If it appears useful for practical applica- 

 tions, the necessary modifications can always be fovmd in order to execute the 

 phenomenon in the best possible way. 



Finally, we should like to state that the present paper is original and that 

 the devices described in it are patented. 



DISCUSSION 



Prof. M. Poreh 

 Technion-Israel Institute of Technology 

 Hafia, Israel 



The propulsion effect of certain xmsteady motions of a mass within a 

 closed system with rigid boundaries seems, at first, surprising and contra- 

 dictory to physical laws. The phenomenon is not new, however. The "Mexi- 

 can jumping bean" is just one example of a motion due to polarized accelera- 

 tion. Friction is the dominating factor in all of Prof. DiBella's experiments. 

 In some of them, the friction coefficient is very small indeed, but so is the 

 power necessary to maintain the motion. 



1395 



