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Rolls-Royce completes assembly of fuel-efficient UltraFan demonstrator engine
Rolls-Royce has completed its UltraFan demonstrator engine, which can improve aircraft fuel efficiency by 10 percent. The engine boasts a 12-foot (140-inch) fan system, the largest in the world, and is designed to run on 100 percent sustainable jet fuel. It has now been moved from the workshop to Testbed 80, a £90 million ($109.5
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