History Hour: Sikorsky Sea King prototype makes first flight
This Day in Aviation, Sikorsky/Lockheed Martin
On the 11th of March 1959, at Stratford, Connecticut, the prototype of Sikorsky XHSS-2 Sea King, U.S. Navy Bureau of Aeronautics serial number (Bu. No.) 147137, company serial number 61001, makes its first flight. Sikorsky’s Assistant Chief Test Pilot Robert Stewart Decker is at the controls.
The Sikorsky SH-3A Sea King was the first of the S-61 series of military and civil helicopters, designated as HSS-2 until 1962. It is a large twin-engine helicopter with a single main rotor/tail rotor configuration. The fuselage is designed to allow landing on water. The helicopter was originally used as an anti-submarine helicopter.
The SH-3A is 72 feet, 7 inches (22.123 meters) long and 16 feet, 10 inches (5.131 meters) high with all rotors turning. The main rotors and tail can be folded for more compact storage aboard aircraft carriers, shortening the aircraft to 46 feet, 6 inches (14.173 meters). The main rotor has five blades and a diameter of 62 feet (18.898 meters). Each blade has a chord of 1 foot, 6.25 inches (0.464 meters). The tail rotor also has five blades and a diameter of 10 feet, 4 inches (3.150 meters). They each have a chord of 7–11/32 inches (0.187 meters).
The SH-3A was powered by two General Electric T58-GE-6 turboshaft engines, which had a Normal Power rating of 900 horsepower, and Military Power rating of 1,050 horsepower. The main transmission was rated for 2,300 horsepower, maximum. (Later models were built with more powerful T58-GE-8 engines. Early aircraft were retrofitted.)
The first Sea King, prototype XHSS-2 Bu. No. 147137, demonstrates its capability of landing on water. (Photo by Sikorsky, a Lockheed Martin Company)
The SH-3A has a cruise speed of 125 knots (144 kilometers per hour) at Sea Level, and a maximum speed of 135 knots (155 kilometers per hour) at Sea Level. The service ceiling is 14,000 feet (4,267 meters). The design maximum gross weight is 16,237 pounds (7,365 kilograms). The SH-3A had a combat endurance of 4 hours.
In 1962, the HSS-2 was redesignated SH-3A Sea King. Many early production aircraft have remained in service and have been upgraded through SH-3D, SH-3G, etc. In addition to the original ASW role, the Sea Kings have been widely used for Combat Search and Rescue operations. Marine One, the call sign for the helicopters assigned to the President of the United States, are VH-3D Sea Kings.
Sikorsky produced the last S-61 helicopter in 1980, having built 794. Production has been licensed to manufacturers in England, Italy, Canada and Japan. They have produced an additional 679 Sea Kings.
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Text Author: Bryan R. Swopes