Just because it's the weekend doesn't mean you have to switch your brain off completely.
Smarter Every Day continues its video series on the
physics behind helicopters with a look at how choppers use something called a swashplate to vary the pitch of its rotor blades to climb higher and fly in any direction.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/3wfOIwx0r8s/so-how-does-the-horizontal-spinning-blade-on-a-helicopter-propel-it-forward
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