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59 The difference in pattern is mainly due to the Power specific fuel consumption (PSFC) of the gas turbine engines. The PSFC of turboshaft was calculated based on the requirement of pow- er for every specific aircraft while for turboprop engine a standard PSFC was applied. 10000 9500 9000 8500 8000 7500 TSTE2 TSTH2 5.1E-08 TPTE2 TPTE4 TPTH2 TPTH4 5.5E-08 PSFC (kg/W/s) TSTE4 TSTH4 7000 4.9E-08 5.3E-08 5.7E-08 5.9E-08 6.1E-08 Figure 5.5 PSFC vs fuel mass For turboprop engine, increasing the number of engines decreases the fuel required. This dif- ference is because of the increase in propeller efficiency during cruise, landing, take-off and second segment climb. Since the power required for take-off by one engine is lower for a 4- engine aircraft, the PSFC is higher. Therefore, for turboshaft engine, the PSFC increases with the decrease in power required and hence the power required is inversely proportional to fuel mass. Fuel Mass (kg)PDF Image | Comparison of Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion
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