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Do electric ‘jet’ engines need ‘bypass’ air for increased efficiency or is just a combustion problem?
by exabrial 4y ago
Do electric ‘jet’ engines need ‘bypass’ air for increased efficiency or is just a combustion problem?
- mberning 4y agoIt is all bypass air. None is consumed by the engine.
- exabrial 4y agoGood point. I guess I mean is there a channel where air is sucked in like a Dyson ‘bladeless’ ‘fan’?
- ReactiveJelly 4y agoDidn't see one in the technical blog. Imagine a huge two-engine jetliner. Replace the jet turbines with electric motors. Shrink the entire nacelle. Keep shrinking it, and then multiply it until you have 24 tiny motors in 24 tiny nacelles. Then integrate those nacelles into the flaps on the back of the wings. That, and 12 more tiny motor-nacelle-flaps on the front canards, is how their diagram looked.
- borlox 4y agoLook for „Disk Loading“ - in short, the more rotor surface you have for every kilogram of mass, the more efficient your vehicle will hover. Turbo fan engines work more efficient, because with their huge fan diameter, they have lower disk loading than turbo jet engines without bypass. Lilium has a very high disk loading, resulting in low efficiency, resulting in short possible hovering times.