From: jrfrank@ibm-pc.borg.retro.com   
      
   henry@spsystems.net (Henry Spencer) wrote in   
   news:HrwsK9.IKr@spsystems.net:   
      
   > In article ,   
   > Michael K. Heney  wrote:   
   >>Next, the "English"  Isp uses pounds mass, not pounds force.  So the   
   >>equivalent metric version would be Kg/(Kg/sec) rather than Newtons;   
   >>resulting in "seconds" as the unit.   
   >   
   > Proper metric practice never, ever uses the kilogram as a unit of   
   > force -- it is always mass.  Just because some versions of the   
   > Imperial units are stupid about this is no reason to repeat the   
   > mistake.   
      
   Imperial units aren't the only ones stupid about this. I see plenty of   
   references to kgf in spacecraft specs, especially Russian ones.   
      
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