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Tonnage Through Tibet

military supply capability methodology (1950s),
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Tonnage Through Tibet

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3. Twenty percent is added for trucks temporarily off the road or under repair and for other vehicles in convoy.  
 
4. The delivered tonnage is subtracted from the beginning tonnage to determine the amount of gasoline used en route.4  
 
An example of the fuel and tonnage calculation for a 400mile trip follows:  
                       
  Beginning of stage 1.
  Tonnage of supplies and gasoline loaded
500
  Beginning of stage 2.
  500 tons minus 5 percent (500-25)
475
  Beginning of stage 3.
  475 tons minus 5 percent (475 - 24)
451
  Beginning of stage 4.
  451 tons minus 5 percent (451 - 23)
428
  Amount of supplies
   
  delivered at end of              
  stage 4.   428 tons minus 5 percent (428-21) 407 5
     
Tons of gasoline used    
  en route.
  (500-407)
93
                       
_____________
Another method, used by DOD analysts, which gives approximately the same results is to make a separate calculation for (1) the amount of gasoline used to haul the supplies, (2) the amount of gasoline used to haul the gasoline for the supply trucks, (3) the amount of gasoline used to haul the gasoline used in (2), and so on until the figure becomes insignificant. When the total amount of gasoline required has been obtained, it is added to the tonnage of supplies, and the computation for the number of trucks required is completed.
                       
If more than a few stages are involved, use of the following formula will greatly facilitate the computation of the tonnage delivered at the end of the final stage.
                       
        Dn = T (1-.05) n            
                       
    where Dn = amount of supplies delivered at end of the nth stage,          
                       
        n = number of stages,      
        T = amount of supplies and gasoline loaded at beginning of stage 1, and      
                       
    (1 - 0.5)n = 5 percent decrease in load during each stage.          
                       
  The amount of gasoline required for the round trip of all trucks used in n stages is T-Dn.      
 
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Posted: May 08, 2007 09:01 AM
Last Updated: May 08, 2007 09:01 AM