Honestly, it's fascinating to see the people, the process and ultimately the "straight up difficult" work finally come to fruition in such an amazing way. A wonderful and informative segment from NPR, who has more videos you can check out by clicking here to go to their Vimeo page.
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.