>> http://www.brickengineer.com/pages/2007/11/27/smooth-lego-clutch/
>
> OK, so there's your clutch. Now, how to convert the rotational motion of 
> an axial into the sliding motion to operate this clutch?

http://en.wikipedia.org/wiki/Centrifugal_governor

Shouldn't be too hard to rig something up that works this way out of lego, 
and use the linear motion to control the position of the clutch.

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