text: thrust. Because of the high fuel consumption 
  during afterburner operation and the adverse 
  effect on endurance, the use of the afterburner 
  should be limited 
  to short periods of time. 
  In addition, there may be limited time for the 
  use of the afterburner due to critical heating 
  of supporting or adjacent structure in the vicin- 
  ity of the afterburner. 
  
  immediate advantage in that it prevents fouling 
  of the plumbing from the freezing of residual 
  fluid at low temperatures. 
  In addition, a large 
  concentration of alcohol in the mixture can 
  provide part of the additional chemical energy 
  required to maintain engine speed. In fact, 
  the large concentration of alcohol in the in- 
  jection mixture is a preferred means of adding 
  additional fuel energy. 
  If the added chemical 
  the water flow, no 
  energy is included with 
  abrupt changes in governed fuel 
  flow are 
  necessary and there is less chance of underspeed 
  injection and overspeed or over- 
  with 
  temperature when fluid flow is exhausted. Of 
  course, strict proportions of the mixture are 
  necessary. Since most water injection devices 
  are essentially an unmodulated flow, the use 
  of this device is limited 
  to high engine speed 
  and low altitude 
  from quenching combustion. 
  
  The specific fuel consumption of the basic 
  the addition of the 
  engine will 
  afterburner apparatus. The losses incurred by 
  the greater fluid friction, nozzle and flame- 
  holder pressure drop, etc. increase the specific 
  fuel consumption of the basic engine approxi- 
  mately 5 to 10 percent. 
  
  to prevent the water flow 