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![Request] How much would wearing a helicopter hat save in energy over the course of a marathon? : r/theydidthemath](http://www.taghats.com/wp-content/uploads/2015/04/Helicopter-Hat.jpg "Request] How much would wearing a helicopter hat save in energy over the course of a marathon? : r/theydidthemath")
Request] How much would wearing a helicopter hat save in energy over the course of a marathon? : r/theydidthemath
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Propeller Beanie - Fancyclopedia 3
![request]saw this meme, how fast does the propeller blade have to spin for a 50kg person to fly? : r/theydidthemath](https://preview.redd.it/sktgnrgcg6f71.jpg?width=1080&crop=smart&auto=webp&s=81e7e31288c9632b08efd2d04ed0fec1ae5de023 "request]saw this meme, how fast does the propeller blade have to spin for a 50kg person to fly? : r/theydidthemath")
request]saw this meme, how fast does the propeller blade have to spin for a 50kg person to fly? : r/theydidthemath
Multi-color Propeller Hat Accessory
History of the Propeller Beanie and The Ultimate Propeller-Head - Origin of this Geek Icon and an Unusual Patent
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Propeller Beanies With Optional Motors And Neck Clamps (Hella Chic)
History of the Propeller Beanie and The Ultimate Propeller-Head - Origin of this Geek Icon and an Unusual Patent
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Propeller Beanie - Fancyclopedia 3
Yamakopter the Original Novelty Kippah With a Spinning Propeller, the Perfect Jewish Gift for Hanukkah and Rosh Hashanah - Etsy UK
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Interstellar Propeller
GMiller.net » New Propeller Hat
Adult Tom Propeller Beanie Hat Clown Costume Baseball Helicopter Copter Ball Cap | eBay
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How fast would the blades in a propeller beanie have to spin in order to make a kid fly? - Quora
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GMiller.net » New Propeller Hat
