rate of climb of 100 fpm. The altitude which 
produces a rate of climb of 500 fpm is termed 
the combat ceiling. Usually, these specific refer- 
ence points are provided for the airplane at 
the combat configuration or a specific design 
configuration. 
The composite curves of climb performance 
for the typical turbojet airplane are shown in 
figure 2.22. One particular point to note is 
the more rapid decay of climb performance