text: Higher 
  temperatures produce definite reduc- 
  tions in the strength of aluminum alloy and 
  require the use of titanium alloys, stainless 
  steels, etc., at very high temperatures. Con- 
  tinued exposure at elevated temperatures effects 
  further reductions of strength and magnifies the 
  problems of “creep” 
  failure and structural 
  stiffness. 
  
  The turbojet engine is adversely affected by 
  high compressor inlet air temperatures. Since 
  the thrust output of the turbojet is some func- 
  tion of the fuel flow, high compressor inlet air 
  temperatures reduce the fuel flow that can be 
  temperature 
  turbine operating 
  used within 
  limits. The reduction in performance of the 
  turbojet engines with high compressor inlet 
  air temperatures requires that the inlet design 
  produce the highest practical efficiency and 
  minimize 
  the air 
  delivered to the compressor face. 
  
  flight speeds and compressible flow 
  dictate airplane configurations which are much 
  different from the ordinary subsonic airplane. 
  To achieve safe and efficient operation, the pilot 
  of the modern, high speed aircraft must under- 
  stand and appreciate the advantages and dis- 
  advantages of the configuration. A knowledge 
  of high speed aerodynamics will contribute 
  greatly to this understanding. 
  
  High 