https://youtu.be/nM86DBOqgPM?is=3_Gr-GjwTn2XH1z-
2:53 Jet engines are far more complex - take the turbine blades, for example which must be grown as a single crystal of a nickel super-alloy to withstand the heat and physical forces.
https://youtu.be/QtxVdC7pBQM?is=SCbLua2xNvguGoTK
5:30 they built a 400kW electric motor. (Standard Tesla motors are 137 - 200 kW.)
7:45 actuators: Boeing aircraft have 2 or more backup systems to drive hydraulic systems (electric pump, ram-air turbine in case of total engine failure) — what backup systems will this aircraft have for flight control systems? Maybe a hydraulic pump run by the hybrid engine.
9:45 hardest design challenge was dealing with a diverted flight destination: 1 in every 1000 flights is diverted. That's why they needed a hybrid engine design.
12:55 first flight
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