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Old 4th September 2007 | 11:45
  #20 (permalink)  
Graviman
 
Joined: Nov 2004
Posts: 1,334
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From: Cambridgeshire, UK
Guys, this is all wrong! The need is to get energy from the jet stream and into the helicopter, right? The solution - wonderfully simple:

The wind-up helicopter.

Now who wants first go at clipping on the tether to wind up the spring?
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