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Component Superconductive Motor Superconductive Cables Power Electronics Generator Specific weight Efficiency 20 kW/kg 99% 9.2 kg/m 100% 18 kW/kg 99.5% 5 kW/kg 95% 74 6.3 Future Work When the complete design of the partial turbo-hydraulic propulsion system is proven, the shaft off-take power extraction of the turbofan engine can be improved by designing the core and turbine specially to meet the requirements. Many more thrust levels can be efficient and become reality. In Figure 6.4, max rated horse power extraction as % of shaft power is com- pared for different engines. It also shows that latest generation engines extract more % of shaft power. The increase in extraction of shaft power is because all the manufacturers head towards a more electric aircraft. Figure 6.4 Shaft Power offtake levels of different turbofan engines (Lupelli 2011) The overall mass of the electric system is said to be diminished in the future by manufacturing components with superconductive materials as shown in Table 6.2. Even though the values in the below table look futuristic, NASA estimates to achieve this by 2030 (Smith 2018). This might lead to better aircraft design and efficiency. But comparing the two-propulsion system’s mass breakdown in the current scenario, one can deduce that the electric system is heavier. Even though, the electric system is more efficient, the hydraulic system’s power to weight ra- tio is lower. Table 6.2 Superconductive components of electric system (Pornet 2017)PDF Image | Comparison of Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion
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