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How helicopters fly anyway? Why don't they spin or drift? [Video]
posted June 6 2012 3:13.50 by Giorgos Lazaridis

There are some very interesting secrets and awesome mechanics on those marvelous machines! Helicopters are able to float in a stable position as well as rotate in all directions, go forward or backwards, up side down - in side out and round around... But how can they achieve all that staff, given that the rotation speed of the blades is always stable???

[Link: Smarter Every Day]

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