text: nautical miles/hr. 
  lbs. of fuel/hr.  ‘pecific range= 
  
  thus, 
  
  velocity, knots 
  fuel flow, lbs. per hr. 
  specific range = 
  
  If maximum specific range is desired, the flight 
  condition must provide a maxinium of velocity 
  fuel flow. This particular point would be 
  located by drawing .a straight line from the 
  origin tangent to the curve of fuel flow versus 
  velocity. 