From: schillin@spock.usc.edu   
      
   alexterrell@yahoo.com (Alex Terrell) writes:   
      
   >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.   
      
   Minimum-energy delta-V is a hair under 350 m/s, from L1 to either L4   
   or L5 and for either definition of "L1".   
      
   Trip time, for the minimum-energy trajectory, is about a month.  Added   
   delta-V will reduce trip time in *very roughly* inverse proportion.   
      
      
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