The Composite Force of the  Radiometer

L. Thompson

I call the radiometer force a composite force as it includes the deceleration of the rarefied gas molecules in transferring molecular momentum to give the macro acceleration of the radiometer vanes.  My testing is in a partial vacuum of 100 to 300 microns. I used a 60w halogen light focused on various weight aluminum strips with carbon black on one side.

I observed a light weight, 0.002 gm aluminum strip, holed on one end to hang on a horizontal rod, moved first with agitation and then energetically around and along the rod.  Though a small mass,  I found the centrifugal motion could also be a directional movement. 

With limited equipment I do not take the testing further. As a proposal for future testing I would next use a test "apparatus" designed with the "surfaces" now fixed on a rod. The rod suspended at the two ends with a fine wire.  This test would be to determine if the net force could be directed to propel such a light weight "apparatus" forward. 

The forward movement would be limited by the mounting. Yet I feel the confirmation of a forward movement could open a possibility the application of a net force might cause the acceleration of a body by using the inertia of a body itself (rather than the earth) as the "accelerative base".  (I also "see" here the possibility of an efficiency.)

I next visualize enclosing the "apparatus" with a light,  transparent film, now changing my perspective to one of the internal application of a net force. 

In an uncompleted "ending", I feel a more full explanation of the radiometer would require studying the radiometer as a total accelerative process. The study would include the initial energizing of the rarefied gas molecules. It would include the deceleration phase of the rarefied gas molecules and the resulting net macro acceleration.  It would explore the implied high molecular velocities across the vane surfaces. It would explore why there seems little offsetting back force in the net macro acceleration (until vane equilibrium is reached). The study would explore the efficiency of the transfer of molecular momentum to macro momentum.

Subsequently, would such a study portend another form of acceleration?