From: max@alcyone.com   
      
   Mike Miller wrote:   
      
   > Orbiter with typical ET residuals (15,000lbs): 200,000lbs   
   > Orbiter after expending residuals: 185,000lbs   
   > Specific impulse of the SSMEs in vacuum: 455 sec^-1.   
      
   Specific impulse (when measured this way) is measured in seconds, not   
   inverse seconds.   
      
   > (455 sec^-1) x (9.8m/s/s) x Natural Log (200,000lbs / 185,000lbs) =   
   > 347 m/s.   
      
   As this equation can attest to; s^-1 times m/s^2 is m/s^3, not m/s.   
      
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    __ Erik Max Francis && max@alcyone.com && http://www.alcyone.com/max/   
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