Sikorsky CH-53 Sea Stallion, a heavy-lift helicopter introduced in 1966 with two engines, a six bladed main rotor and a four bladed tail rotor. Developed as a transport helicopter and an assault helicopter.
Sikorsky CH-53E Super Stallion and Sikorsky MH-53E Sea Dragon, a heavier helicopter introduced in 1981, developed from the CH-53 Sea Stallion by adding a third engine, a seventh blade to the main rotor and canting the tail rotor 20 degrees. The MH-53E Sea Dragon is used for long range mine sweeping or airborne mine countermeasures.
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