Fuel weight estimates of military turbo-propeller transport aircraft

This article presents a semi-empirical model for fuel weight estimates based on mission requirements (i.e. payload and range), with the operating empty weight as parameter. The model applies to military turboprop transport aircraft, and is based on actual aircraft data. It is particularly suited for conceptual and preliminary design since it relies on the operating empty weight as sole parameter. The model is validated so it forms a sound and accurate alternative to the Breguet range equation. Empirical correlations are also proposed for the dependance upon the gross weight of the specific range and the fuel flow rate, along a flight at constant cruise altitude.