Trent 800
Rolls-Royce Trent 800
Type	Turbofan
Manufacturer	Rolls-Royce plc
First run	September 1993
Major applications	Boeing 777

The Rolls-Royce Trent 800 is a turbofan engine, developed from the RB.211 and is one of the family of Trent engines.

[edit] Design and development

In the late 1980s, Boeing were 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 80,000 lbf (360 kN) or more. The Trent 700's 2.47 m (97 in) diameter fan would not be big enough to meet this requirement, so Rolls proposed a new version with a 2.80 m (110 in) 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.^[1]

Testing of the Trent 800 began in September 1993, and certification was achieved in January 1995.^[2] The first Boeing 777 with Trent 800 engines flew in May 1995, and entered service with Cathay Pacific in April 1996. 180 minutes ETOPS approval was granted by the FAA on 10 October 1996.^[3]

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.^[4]

[edit] Accidents and incidents

Laboratory duplication of ice crystals clogging the Fuel-Oil Heat Exchanger (FOHE) on a Rolls-Royce RB211 Trent 800 series engine. From the NTSB report^[5] on the BA flight 38

On 17 January 2008, a British Airways Boeing 777-236ER, operating as flight number BA038 from Beijing to London, crash-landed at Heathrow after both Trent 800 engines lost power during the aircraft's final approach. The subsequent investigation found that the cause was ice released from the fuel system which accumulated on the fuel-oil heat exchanger leading to a restriction of fuel flow to the engines.^[6] Rolls-Royce is developing a modification to prevent the problem recurring.^[7]

[edit] Applications

The Trent 800 family powers the Boeing 777. It is available on the 777-200, 777-200ER, and 777-300 variants, with thrust ratings spanning 75,000 to 95,000 lbf (330 to 420 kN). The engine is one of the lightest in its class; a Trent-powered Boeing 777 weighs up to 3.6 tonnes less than General Electric and Pratt & Whitney-powered versions.

[edit] Specifications (Trent 800)

General characteristics

• Type: Three-shaft high bypass ratio (6.2-5.7) turbofan engine
• Length:
• Diameter: 2.79 m (110 in)
• Dry weight:

Components

• Compressor: Eight-stage IP compressor, six-stage HP compressor
• Combustors: Single annular combustor with 24 fuel injectors
• Turbine: Single-stage HP turbine, single-stage IP turbine, five-stage LP turbine

Performance

• Maximum Power output:
• Power-to-weight ratio:

[edit] See also

Related lists

• List of aircraft engines
  

[edit] References

[edit] Notes

[edit] External links

Wikimedia Commons has media related to: Rolls-Royce Trent

• Rolls-Royce plc - Trent 800

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