text: will 
  takeoff distance: 
  
  cause these approximate  increases in 
  
  3% percent for the supercharged recipro- 
  cating airplane when below critical 
  altitude 
  
  7 percent for the turbojet with high thtust- 
  
  to-weight ratio 
  
  10 percent for  the turbojet with  low 
  
  thrust-to-weight ratio 
  
  These approximate relationships show 
  the 
  turbojet airplane to be much more sensitive to 
  density altitude than the reciprocating powered 
  fact which 
  airplane, This is an important 
  in transition 
  must be appreciated by pilots 
  from propeller 
  type airplanes. 
  to 
  Proper accounting of pressure altitude (field 
  elevation is a poor substitute) and temperature 
  is mandatory for accurate prediction of takeoff 
  roll distance. 
  
  jet 
  
  takeoff 
  performance are the result of somecombination 
  of high gross weight, altitude, 
  temperature 
  and unfavorable wind. 
  In a11 cases, ir be- 
  hooves the pilot to make an accurate prcdic- 
  tion of takeoff’ distance from the performance 
  data of the Flight Handboo& regardless of the 
  runway available, and to strive for.2 polished, 
  professional takeoff technique. 
  
  The most critical conditions of 
  
  In the prediction of takeoff distance from 
  the handbook data, the following primary 
  considerations must be given: 