Rolls-Royce announced on Monday that it has officially started building its UltraFan demonstrator engine at the company’s dedicated DemoWorks facility in Derby, U.K. According to Rolls-Royce, the completed UltraFan will be the largest aeronautical engine ever built with a fan diameter of 140 inches. The company says the UltraFan will deliver a 25 percent improvement in fuel efficiency compared to the first-generation Trent engine.
This is a companion discussion topic for the original entry at https://www.avweb.com/ownership/engines/rolls-royce-begins-ultrafan-construction