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protomyth
on Sept 4, 2020
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Rocket Helicopter (2010)
Sounds a bit like the Fairey Rotodyne which had the same setup using small jets. It was very loud even for the standards of the day.
https://www.youtube.com/watch?v=EA3AkvxwS_M
https://en.wikipedia.org/wiki/Fairey_Rotodyne
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Search:
https://www.youtube.com/watch?v=EA3AkvxwS_M
https://en.wikipedia.org/wiki/Fairey_Rotodyne