Specifications
The engine is a 700 lbf (3,100 N) thrust class medium-bypass ratio (4:1 bypass ratio) turbofan with a fan diameter of about 15 inches. Length is 41 inches (1,000 mm), and basic engine weight was 85 pounds. At the time of testing in March 2001 of an early EJ22 prototype the engine weighed 96 lb (44 kg) and demonstrated a thrust-to-weight ratio of 7.52. The main compressor has 6 stages, and weighs only 1.22 lb (0.55 kg). Engine layout was a three-spool arrangement, with all three compressors and turbines being axial. This was a departure from previous Williams engines, which had all used centrifugal high-pressure compressors followed by axial turbines. A reverse flow combustor and a mixed exhaust were other features.
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