S-76C Plus Demonstrator Model
The Sikorsky S-76 Spirit is a multi-purpose medium-size commercial helicopter. The S-76 is powered by two turboshafts has a four-blade main and a four-blade tail rotor as well as a retractable landing gear. The development of the machine began with Sikorsky in the middle of the 1970s. Target group were companies which looked for a medium business helicopter as well as the oil drilling industry. Sikorsky s development experiences from the UH-60 Black Hawk served as the basis for the S-74 (later renamed S-76 Spirit in honor of the US Bicentennial). which was able to transport 2 pilots and 12 passengers received first two Allison 250 C30 turboshafts with 478 kW each. The prototype completed its first flight on 13 March 1977. The S-76A was the first production variant. The type achieved 1982 several class records within the range climbing achievement maximum speed and ceiling. After the S-76A the S-76 Mk II (1982) the S-76B in the year 1987 with a top speed of 155 knots at sea level. Until December 2005 the S-76C+ was in production. It is equipped with TurbomTca Arriel 2S1 engines with FADEC and an EFIS suite from Honeywell. The tail rotor could be made quieter by modification. For comfort increased active noise and vibration dampers are used. The main rotor is manufactured from composite materials. Since 3 January 2006 the certified S-76 C++ has the more efficient TurbomTca Arriel 2S2 an intake air filter an improved and quieter transmission as well as changes of detail at the interior equipment and electronics. There were 92 orders as of January 2006. An S-76D model is planned for 2008.