The Composite Force of the  Radiometer

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 net acceleration of the radiometer vanes. After the transfer of molecular momentum the rarefied gas molecules become  a dead weight until re-energized. My testing is in a partial vacuum of 100 to 300 microns. I use a 60w halogen light focused on various weight aluminum strips with carbon black on one side. The strips were holed to freely move on a horizontal rod.

With the weightier strips, after a little back and forth movement, the strips would bind on the rod. Yet I observed a 0.002 gm, 1 cm strip, holed on one end to hang on the rod, that the strip moved first with agitation and then energetically around and along the rod.  Though a small mass,  I found the centrifugal motion could also have a directional movement.  (Note: this would tend to confirm Cooks original observations. , 2nd paragraph.)

With limited equipment I do not take the testing further. As a proposal for additional testing I would next use a test "apparatus" with the "surfaces"  fixed to a light weight rod. The rod suspended at the ends with fine wires. This test would 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". 

A fuller explanation of the radiometer could require studying the radiometer as an accelerative process. The study would include the initial energizing of the gas molecules and the deceleration phase of the  rarefied gas molecules to give the resulting macro vane acceleration.  It would explore the implied high molecular velocities across the vanes. It would explore why there seems little offsetting back force in the net macro acceleration. The study would explore the efficiency of the transfer of molecular momentum to macro vane and harness momentum.

I feel the radiometer composite force, using vane and harness inertia as the base, could be capturing most of the molecular momentum to reach, in a well balance radiometer, 2000 to 3000 rpm.

In my paper, (note D), I propose a  net force may be taking place in the spiral galaxies.  If so, such a net force could address the gap of the cosmological "constant". Then understanding the radiometer mechanics may have a broader application.  

A science class as a class project for a science fair could set up a small vacuum chamber to  demonstrate the radiometer properties.   March 24, 2015 .