RB211

Visão geral

The Rolls-Royce RB211 é um dos motores a jato mais significativos historicamente já construídos. Developed in the 1960s as a competitor for the Lockheed L-1011 TriStar programme, the RB211 pioneered the três carretéis engine architecture that would define the Rolls-Royce Trent family for decades. It also nearly destroyed the company: the enormous cost of developing its revolutionary pás de fan compostas, combined with a fixed-price contract, drove Rolls-Royce into insolvency in 1971 — leading to nationalisation by the British government.

Apesar de its turbulent birth, the RB211 proved to be an exceptional engine. Its configuração de três carretéis, titanium and carbon-fibre materials (the pás de fan compostas were ultimately replaced with titanium), and advanced aerodynamics delivered performance that set new industry benchmarks. The RB211-535 variant became the sole engine for the Boeing 757, accumulating an outstanding reliability and safety record over more than 30 years of production.

Especificações técnicas

Variantes

• RB211-22B: Original production variant for the L-1011 TriStar at 42,000 lbf, incorporating titanium fan blades after the composite design was abandoned.
• RB211-524: Significantly uprated variant at 53,000–60,600 lbf for the Boeing 747-200/-300/-400, featuring an enlarged fan and improved core.
• RB211-535C/E4: Extensively redesigned variant for the Boeing 757, with a new fan, a two-stage turbina de pressão intermediária, and improved eficiência de combustível. The -535E4 was the definitive 757 engine, powering the aircraft for United Airlines, Delta, British Airways, and many others.

Aplicações em aeronaves

• Lockheed L-1011 TriStar — aplicação de lançamento
• Boeing 747-400 (RB211-524 series)
• Boeing 757-200 (RB211-535 series)
• Boeing 757-300 (RB211-535 series)

História do desenvolvimento

Rolls-Royce launched the RB211 in 1966 after winning the Lockheed L-1011 engine contract. The programme was technically audacious: the configuração de três carretéis was sem precedentes in commercial aviation, and the use of Hyfil carbon-fibre pás de fan compostas was ahead of its time. When bird-strike testing shattered the composite blades, Rolls-Royce was forced to redesign them in titanium, absorbing enormous additional costs on a fixed-price contract. The company filed for bankruptcy in February 1971. The British government nationalised Rolls-Royce within weeks, judging the engine manufacturer too strategically important to allow to fail. The RB211 entrou em serviço com Eastern Air Lines on the L-1011 in 1972. The RB211-535, developed for the 757, became the direct ancestor of the Trent family: Rolls-Royce stretched and developed the RB211 core progressively from the 1970s through the 1990s, eventually producing the Trent 700, Trent 800, Trent 900, and Trent 1000.