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The Rolls-Royce Trent 800 is a high-bypass turbofan aircraft engine, developed from the RB211 and is one of the family of Trent engines. It was designed to be used on the Boeing 777. ==Design and development== In the late 1980s, Boeing was investigating an enlarged development of its 767 model dubbed the 767X, for which Rolls-Royce proposed the Trent 760. By 1990 Boeing abandoned its planned 767X and instead decided to launch a new, larger aircraft family designated 777 with a thrust requirement of or more. The Trent 700's diameter fan would not be big enough to meet this requirement, so Rolls proposed a new version with a fan diameter, designated Trent 800. Rolls brought in Kawasaki Heavy Industries and Ishikawajima-Harima Heavy Industries as risk and revenue sharing partners who between them took an 11 per cent stake in the Trent 700 and 800 programmes.〔(【引用サイトリンク】 url = http://www.rolls-royce.com/japan/en/partners/default.htm )〕 Testing of the Trent 800 began in September 1993, and certification was achieved in January 1995. The first Boeing 777 with Trent 800 engines flew in May 1995, and entered service with Thai Airways International on 31 March 1996.〔Boeing 777〕 180 minutes ETOPS approval was granted by the FAA on 10 October 1996. Initially Rolls-Royce had difficulty selling the engine: British Airways, traditionally a Rolls-Royce customer, submitted a large order for the competing General Electric GE90 engine. The breakthrough came when the company won orders from Singapore Airlines, previously a staunch Pratt & Whitney customer, for its 34 Boeing 777s; this was soon followed by large North American orders from American Airlines and Delta Air Lines for their 777 fleets. British Airways announced in September 1998 that it was returning to Rolls-Royce for its second batch of 777s, and did so again in April 2007. The Trent 800 has a 41% share of the engine market on the 777 variants for which it is available. Rolls-Royce Trent 800s are now commonly used on the Boeing 777 series. Major airlines such as Air New Zealand, British Airways, American Airlines, Kenya Airways, Emirates, and many other airlines now operate Boeing 777s with Trent 800s on a regular schedule.〔(【引用サイトリンク】 url = http://www.rolls-royce.com/civil/products/largeaircraft/trent_800/ )〕 As of 2014 Rolls-Royce is offering an upgraded version of the engine – Trent 800EP. It incorporates technology from Trent 1000 and TrentXWB engines including elliptical leading edges on intermediate- and high-pressure compressor blades. Rolls-Royce claims that it provides a 0.7% fuel-burn benefit. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rolls-Royce Trent 800」の詳細全文を読む スポンサード リンク
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