text: NAVWEPS 00-801-80 
  AIRMANE Pl?RFORMANCE 
  
  (c) Very high altitude flight produces low 
  compressor Reynolds numbers and an effect 
  similar 
  to that of airfoil sections. As a 
  decrease to low Reynolds numbers reduces 
  the section c&, very high altitudes reduce 
  the maximum pressure ratio of the com- 
  pressor. The reduced stall margins increase 
  the likelihood of compressor stall. 