Suggestion from Advanced Space Propulsion Workshop in Huntsville Alabama for a null experiment. If we were to place identical brass masses on either side of our active PZT stack, then the mass fluctuations would result in pushes and pulls of equal magnitude and the device should just oscillate a little but show no average thrust. This appeared to be worth testing. It would show that we were able to eliminate any unwanted vibration, noise effects.
We have shown using a Mach Effect Thruster (MET) it is possible to produce a linear thrust with no propellant (1 to 2 micronewtons is the test in this paper). We have utilized the Mach Principle which says in brief, that the inertial mass of a body is determined by its gravitational interaction with the rest of the matter and energy flow in the universe. We sought to prove that we had managed to eliminate all vibration effects from our data and attempted a null experiment. We attached equal size reaction masses to each end of the active PZT stack, this would cause the induced mass fluctuation to push and pull in both directions at once, and the device should not produce a net thrust. In section 3 we have shown that by using equal masses at both ends of our device we can indeed eliminate the net thrust. This is a rather nice way to show that the methods we employ are sufficient to eliminate any systematic “Dean Drive” noise caused by vibration in the system.
In addition we also tried to determine the optimal brass reaction mass to give maximal thrust. We tried several different brass reaction masses, 0.5, 0.625, 0.75, 0.875 and 1.0 inch with masses 64.7g, 80.9g, 96.8g, 112.6g and 128.3g respectively. We found that for the stack N4, the preferred brass reaction mass was 0.625 inch and 80.9g. We have not put all the data here since for a different device one would have to run this kind of test again. But it is clearly something that would be worthwhile to optimize the thrust for a given device.
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