KA-27 Helix

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.

September 3, 2007 6:00 AM PDT

Photo by: PH2 George Sisting, U.S. Navy