Ka-27 was born at the beginning of 80's and has been known in the West with the name code "Helix" and, as the Ka-25 "Hormone", it mounts the same disposition of tri-shovels coaxial rotors with opposite rotation in order to eliminate the problem of the torque that, in this way, would have demanded a longer tail with an anti-torque rotor. For this reason the Ka-27 is widely used on the war ships (as...