text: RIrio of Tbrvrt at dri14 
  ) 
  ti I,‘ bwl 
  Thi 
  1.m 
  Altitude, ft. : 
  ( 
  
  Scalevel............................. 
  5,ooo................................ 
  lO,ooo............................... 
  2o,ooo............................... 
  35,Mx)............................... 
  40,Ko. 
  =Jo,ocQ  ,888 
  .785 
  ,604 
  .392 
  .315 
  .180  ._._..,...._....._,.,.__.,..... 
  
  Since the change in density with altitude is 
  quite rapid at low altitude turbojet takeoff pet- 
  formance wil1 Abe greatly affected at high alti- 
  tude. Also note that the thrust at 35,000 ft. 
  is approximately 39 percent of the sea level 
  value. 
  Dews@ ra#ie 
  
  The thrust added by the afterburner of a 
  turbojet engine is not affected so greatly by 
  altitude as the basic engine thrust. The use of 
  afterburner may provide a thrust increase of 50 
  percent at low altitude or as much as 100 per- 
  cent at high altitude.  scaleeel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Loo0 
  5,ooo.. 
  :. 
  lO,coo.............................. 
  .?2#XQ. 
  35,cao . . . . . . . . . . . . . . . 
  40,oal.. . . . 
  . 
  ~,OUO. .  .a617 
  .7385 
  .4976 
  .3099 
  .2462 
  .lS32  . 