Four-engine propeller airplane endurance performance calculating method

The invention belongs to the aviation medium-sized airplane design field, relates to the four-engine propeller airplane performance calculation, and specifically relates to a four-engine propeller airplane endurance performance calculating analysis and optimization determination method; the method comprises the following steps: determining combination characteristics of a turbine propeller power device and influences on airplane aerodynamic characteristics; using value iteration to obtain airplane cruise fuel consumption ration; obtaining real accurate endurance performance parameters according to fight test verification. The calculating method is direct and simple, easy to handle by airplane design personnel, good for writing an airplane user manual; in addition, the method has important guidance meaning on flight test verification, can save flight-test times, can reduce flight-test period, and saves mass flight-test expenditures. The method is comprehensive in consideration, strong in versatility, wide in application value, suitable for four-engine propeller middle-large airliners, transporters and related platform airplanes.