A pair of Cleveland Metro Life Flight air ambulances fly in formation at the 2009 Cleveland National Air Show.
On the left is a Sikorsky S-76a Spirit and on the right is a Eurocopter Deutschland GMBH MBB-BK 117 C-2.
Sikorsky S-76 Development
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 U.S. 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. Several airlines operate the S-76A on scheduled services including Helijet Airways of Vancouver, British Columbia, Canada.
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. Over 500 S-76s had been delivered by early 2001.
Source: Wikipedia Does the last line quoted above make your head spin? Good..I am not alone then.
More information on the Eurocopter may be found here...
2009 Cleveland National Air Show -- September 6th, 2009