High Quality Content by WIKIPEDIA articles! The Sikorsky S-61L and S-61N are civil variants of the successful SH-3 Sea King helicopter. They are two of the most widely used airliner and oil rig support helicopters built. Carson Helicopters was the first company to shorten a commercial S61. The fuselage is shortened by 50in (1.6m) to increase single engine performance and external payload. A unique version is the S-61 Shortsky conversion of S-61Ls and Ns by Helipro International. VIH Logging was the launch customer for the HeliPro Shortsky conversion which first flew in February 1996. One modification for the S-61 is the Carson Composite Main Rotor blade. These blades replace the original Sikorsky metal blades which are prone to fatigue. The Carson Composite Main Rotor blades permit a modified aircraft to carry an additional 2,000 lb (907 kg) load, fly 15 kn (28 km/h) faster and increases range 61 nmi (113 km).

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