The Rolls-Royce RB211 is a high-bypass turbofan engine designed for commercial aircraft. Introduced in the late 1960s, it was one of the first engines to use a three-shaft design, which improves efficiency and performance. The RB211 powers several aircraft, including the Boeing 747 and Lockheed L-1011 TriStar. Notable for its advanced technology, the RB211 features a wide fan diameter and a high bypass ratio, contributing to quieter operation and reduced fuel consumption. Its development faced challenges, but it ultimately became a successful engine, solidifying Rolls-Royce's reputation in the aviation industry.