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Figure 5.9 Comparison of disc loading and propeller efficiency with number of engines 63 1200.0 1000.0 800.0 600.0 400.0 200.0 0.0 1.000 0.900 0.800 0.700 0.600 0.500 0.400 0.300 0.200 0.100 0.000 24681012 NUMBER OF ENGINES Disc Loading Propeller Efficiency 49000 48000 47000 46000 45000 44000 43000 42000 41000 40000 0 2 4 6 8 10 12 14 Number of engines Figure 5.10 Variation of operating empty mass with increasing number of engines In Figure 5.9, the propeller efficiency in cruise is compared with the increasing number of en- gines and aircraft model with 4 engines has the highest. The reason for this could be because of the lower disc loading, also represented in the Figure 5.9. The disc loading mainly depends on the power required, which in turn depends on the mass of the aircraft. From Figure 5.10, it also evident that the snowball effect for operating mass of the aircraft increases rapidly. The reason for the lower disc loading for the 4-engine aircraft is from the lower operating mass which is almost equal to 2-engine aircraft. Operating empty mass (kg) DISC LOADING (KWM/KG) PROPELLER EFFICIENCYPDF Image | Comparison of Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion
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