Failed: Air Umbrella About five years ago, a Kickstarter popped up for the air umbrella. It wasn’t long before the project fell apart and the company made at least some refunds. Old news, we know. But [The Action Lab] recently explored the physics behin…https://hackaday.com/2020/01/25/failed-air-umbrella/ …
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Reynolds transport theorem applied to a control volume (rain) and the energy needed to scatter that volume with another perpendicular fluid (air).
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