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A comment on Lilium – Electric vertical take-⁠off and landing jet. Parent comment

Re:Lilium – Electric vertical take-⁠off and landing jet by stcredzero on Friday April 21, 2017 @05:09PM (#14169446)
I thought the conversion efficiency for microwaves was 80%.
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Re:Lilium – Electric vertical take-⁠off and landing jet by nradov on Friday April 21, 2017 @05:40PM (#14169641)
Maybe in a kitchen microwave oven. You're not accounting for transmission path losses and receiver conversion efficiency.
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Re:Lilium – Electric vertical take-⁠off and landing jet by stcredzero on Friday April 21, 2017 @08:04PM (#14170394)
Actually, I think that's a figure including transmission and receiver conversion efficiency, but it doesn't include path losses. That's still quite impressive, though.

http://spectrum.ieee.org/energywise/green-tech/solar/japan-d...

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Re:Lilium – Electric vertical take-⁠off and landing jet by nradov on Friday April 21, 2017 @09:39PM (#14170689)
That's for short range transmission to a fixed receiver. So not really relevant for powering aircraft.
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Re:Lilium – Electric vertical take-⁠off and landing jet by stcredzero on Saturday April 22, 2017 @10:18PM (#14176085)
Such microwave systems have been proposed for solar power satellites. They have useful ranges up to 100's of miles.
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