St. a écrit :
>   Laugh if you like, I don't mind, but the solution is clockwork cars.
> 
>    The factory produces a clockwork 'engine' with two pre-wound springs in 
> the car. You go buy it, and drive it off the forecourt. As you drive it, 
> only one spring drives the car, and when that spring winds down enough not 
> to work effectively, the other one kicks in to continue the journey. Here's 
> the good bit: As the second spring is driving you forward, it re-winds the 
> first spring, so this would work in such a way that they would forever be 
> swapping over and eliminating any hands on winding up.
> 

But this cannot work... When spring 1 is wound down completely, you have 
only the energy of one fully wound up spring left. If you use it to 
totally wind up spring 1 again, then you cannot use it to move the car. 
So sooner or later, you'll have to wind the car up again, to re-inject 
energy that has been lost while moving. The fact that there is one or 
two or n springs does not change anything...

So we're back to waiting for the Apocalypse again :-)

-- 
Vincent

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