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A comment on Cleo Robotics Demonstrates Uniquely Clever Ducted Fan Drone.

Re:Cleo Robotics Demonstrates Uniquely Clever Ducted Fan Drone by salty_biscuits on Tuesday February 13, 2018 @08:00PM (#16372466)
Coanda effect? Some little jets somewhere to entrain the flow?
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Re:Cleo Robotics Demonstrates Uniquely Clever Ducted Fan Drone by sebastos on Tuesday February 13, 2018 @08:17PM (#16372572)
Yep, perhaps just coanda effect with control surfaces on the bottom. Sort of like what the AESIR guys did:

https://www.youtube.com/watch?v=KXVtUCABiv8

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