Why chaotic hoses dance

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Hose instability describes the dangerous phenomenon of nozzle whip the fire fighters experience but also sky dancers (Wacky Waving Inflatable Arm Flailing Tube Men).

My video about inward sprinklers on Smarter Every Day: https://youtu.be/M4-L8UgPkOk
Megaflatables: https://www.megaflatables.com

Thank you to @londonfirebrigade for letting me film with them.

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