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This titanium fuel injector head cost 48 hours on a (roughly) $250k piece of capital equipment. Assuming capital service at 12% that’s under $200/injector. I’m not sure what you could get away with in terms of capital depreciation write off but things are moving fast so it had better be pretty steep.
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3D printed copper (NARIoy-Z-40?) should be able to produce a better ultracentrifugual engine – particularly if Gary Hudson’s idea of induced image currents from stator magnet containment is used to reduce the rotating mass:
I bring up copper alloy rather than aluminum because it might be possible to avoid special materials (hence special parts) for the nozzles.
“The best part is no part.” – Elon Musk
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