From: zenadsl6186@zen.co.uk   
      
   Mike Miller wrote:   
      
   > Erik Max Francis  wrote in message   
   > news:<413FA4B1.F5EE8030@alcyone.com>...   
   >   
   >> Specific impulse (when measured this way) is measured in seconds, not   
   >> inverse seconds.   
   >   
   > D'oh! But the number is correct, despite the misplaced unit?   
      
   Yep, or certainly close enough.   
      
   Isp is sometimes measured as x seconds because one pound of propellent will   
   give one pound of thrust for x seconds;   
      
   - or x pounds of thrust for one second. Two pounds of propellant will give   
   one pound of thrust for 2x seconds, or x pounds thrust for 2 seconds; and so   
   on.   
      
   I hope I got that right!   
      
      
   --   
   Peter Fairbrother   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)