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Most Helicopters have 1 horizontal rotor (for vertical lift) and a "Vertical Tail Rotor" the latter actually steers the helicopter and/or helps keep it straight, or stabilizes it however there are some helicopters that have 2 horizontal rotors which rotate in opposite directions which perform the same task. Because (in normal circumstances) with a single over head rotor, the craft needs the vertical rotor to stop it from spinning round and round out of control. With twin overhead rotors both rotors provide lift and by slowing one (usually the rear one if my memory serves correct) it provides steering control. Also the blades do tilt slightly to assist in steering. The twin Vertical rotor is mostly used in the larger choppers for heavier loads like in the Chinook.
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