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Photos: A century of helicopters

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September 3, 2007 6:00 AM PDT

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Some helicopters with two large rotors stack them, rather than place them forward and aft. The rotors spin in opposite directions to keep torque in check. This is the KA-27 Helix, from Russian manufacturer Kamov, landing on the cruiser U.S.S. San Jacinto in a training operation on the Baltic Sea several years ago.

Photo by PH2 George Sisting, U.S. Navy

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