Hi Solar;

Solar Flare wrote:

Yeah, it turns due to the reflected photons (in
theory since photons are on theorem anyway).

In theory yes, if the vacuum is total as in space.

The spindle turns towards the black faces and
away from the white ones in light.

However, the standard Crooks Radiometer has a partial
vacuum. The vanes turn much faster than if there was
a total vacuum and they advance away from the black
side. The black side is hotter than the white or
silvered side. See:
http://en.wikipedia.org/wiki/Crookes_radiometer
http://en.wikipedia.org/wiki/Crookes...ic_explanation
http://en.wikipedia.org/wiki/Crookes...on_t he_vanes

Duane

--
Home of the $35 Solar Tracker Receiver
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