This may do for your report:
Aerodynamics for Naval Aviators
Chap. 2 Airplane Performance
Items of Airplane Performance
Climb Performance
p.155
Specific reference points are established by these composite curves of climb performance. Of course, the absolute ceiling of the airplane produces zero rate of climb. The service ceiling is specified as the altitude which produces a 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 reference points are provided for the airplane at the combat configuration or a specific design configuration.