Lilium achieves first main wing transition for all-electric aircraft [video]

Re:Lilium achieves first main wing transition for all-electr... by p_l on Sunday June 12, 2022 @10:49PM (#31720476)

Autorotation generally works just fine. Most helicopter crashes involve things unrelated to possibility of autorotation or not, and sometimes autorotation won't help when you hit something too hard at the end, with all of it happening because client pushed too hard and overworked the crew (I might be quoting a specific crash here...)

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Re:Lilium achieves first main wing transition for all-electr... by bombcar on Monday June 13, 2022 @12:59AM (#31721357)

Also I suspect the majority of autorotation failures are from using the helicopter for things only a helicopter can do like hovering.

This is why you rarely see them do that, instead they circle - which any small plane could do but the helicopter can hover if needed. It’s just the most dangerous part.

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Re:Lilium achieves first main wing transition for all-electr... by p_l on Monday June 13, 2022 @04:06AM (#31722597)

Hovering is the signature helicopter move for laymen, but it's also considerably hard, and "high hover takeoff/landing" is, IIRC, one of the hardest maneuvers (it's been years since I've read the pilot's textbook, though)

There's also a lot of other things that can impact the event - for example, the crash I mentioned involved bad weather, tired crew, and losing both engines at once due to icing. They autorotated and nobody died... but they fell into a forest, landed hard enough to destroy undercarriage, and the first officer survived by accident due to helping get passengers into position when a tree smashed his station.

EDIT: corrected captain to first officer, as visible in this photo: https://static.polityka.pl/_resource/res/path/bc/08/bc086fae... (it's Mi-8, so captain sits on the left, not on the right as is normal in western helicopters)

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Re:Lilium achieves first main wing transition for all-electr... by fsckboy on Monday June 13, 2022 @04:05AM (#31722586)

if a helicopter hovers high in the air it's not dangerous because they have time to turn that height/energy into forward motion. see "dead man's curve" https://en.wikipedia.org/wiki/Helicopter_height%E2%80%93velo...

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Re:Lilium achieves first main wing transition for all-electr... by cjg on Monday June 13, 2022 @06:13AM (#31723311)

Yes - at height, they tend to move forwards rather than hovering in one spot to avoid getting stuck in a column of downwards moving air: https://en.wikipedia.org/wiki/Vortex_ring_state

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