Helicopter rotor of gravity fore-aft. However, it requires the expense of two large rotors rather than the more common one large main rotor and a much smaller tail rotor. The Boeing CH-47 Chinook is the most common tandem rotor helicopter. Coaxial rotors are a pair of rotors mounted one above the other on the same shaft and turning in opposite directions. The advantage of the coaxial rotor is that, in forward flight, the lift provided by the advancing halves of each rotor compensates for the retreating half of the other, eliminating one of the key effects of dissymmetry of lift: retreating blade
Boeing Chinook (UK variants) due to its remarkable service record. It has seen action in every major operation involving the RAF in the helicopter's 25-year service life, including the Falkland Islands, Lebanon, Germany, Northern Ireland, Iraq, and Afghanistan. During the Falklands War, Chinooks were deployed by both the British and Argentinian forces. In April 1982, five Chinooks were loaded aboard the container ship MV "Atlantic Conveyor" bound for the Falkland Islands, to support the British operations. On 25 May 1982, the Chinook "Bravo November" was sent to pick up freight from HMS "Glasgow". While the helicopter was airborne, the "Atlantic Conveyor" was attacked by