From: root@mauve.demon.co.uk   
      
   Alex Terrell  wrote:   
   > It's often suggested that a catapult on the moon could fire material   
   > from the surface to L1. From there it would be sorted and grouped, and   
   > then sent off in big cargo ships to colony construction sites at L4 or   
   > L5.   
   >   
   > How much delta V is required for this trip? And how long would it   
   > take? My guess is it would be more of a time problem than a delta V   
   > problem.   
      
   It's on the order of the escape velocity.   
   Say 2000m/s.   
   Maybe 5-10% lower, I have not done the numbers.   
      
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