The Sikorsky CH-53K King Stallion is a large, heavy-lift cargo helicopter currently being developed by Sikorsky Aircraft for the United States Marine Corps (USMC).
The design features three 7,500 hp (5,590 kW) engines, new composite rotor blades, and a wider aircraft cabin than previous CH-53 variants.
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It will be the largest and heaviest helicopter in the U.S. military. The USMC plans to receive 200 helicopters at a total cost of $25 billion.
Ground Test Vehicle (GTV) testing started in April 2014; flight testing began with the maiden flight on 27 October 2015. In May 2018 the first CH-53K was delivered to Marine Corps.
The CH-53K is a general redesign with new engines and cockpit layout.
The CH-53K will use General Electric T408 (GE38-1B) engines rated at 7,500 hp (5,600 kW) each and will be able to fly 20 knots (37 km/h; 23 mph) faster than its CH-53E predecessor