Boeing 757 Engine Size

The question you are referring to was asking about the width of the Boeing 777 engine versus that of the Boeing 737 fuselage. In that discussion, we found that the 777 engine diameter ranges from 75% to 97% that of the 737 cabin width, depending on which engine is fitted.

Boeing 757
Boeing 757

The engines of the Boeing 757 are substantially smaller, however. The 757 can be fitted with either Pratt & Whitney PW2000 series or Rolls Royce RB211 turbofans. The maximum diameter of the RB211 is only 6 ft 2.5 in (1.9 m) while that of the PW2000 series is 7 ft 0.5 in (2.15 m). Meanwhile, the 757 fuselage is 12 ft 6 in (3.75 m) in width. In other words, the engine width is only a little over half that of the fuselage, about 57% as wide to be precise. This comparison can be better observed by studying the above three-view diagram of the 757.
- answer by Joe Yoon, 2 February 2003

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