October 17, 2012 AT 7:03 am

Human-Powered Helicopters: Straight Up Difficult

Read the full story here. Explore the history of human flight here. It’s difficult to build a working four-rotor helicopter that spans 100 feet and only weighs 80 pounds. It’s even harder when your engine is a 0.7-horsepower person. But one team of engineering students is trying to do just that.

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