CH-53K King StallionSikorsky CH 53K King Stallion helicopter model. The USMC Sikorsky CH 53K King Stallion is a heavy lift cargo helicopter currently being developed by Sikorsky Aircraft for the United States Marine Corps. The design features three 7,500 hp engines, new composite rotor blades, and a wider aircraft cabin than previous CH 53 variants. It will be the largest and heaviest helicopter in the U. S. military. Scale: 1 48. Rotorspan 19 1 2 inches, Length 18 1 4