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The engines are perfectly round... the nacelles are not!

The first 737s (737-100 and 737-200) had turbojet engines that had a small diameter. When Boeing developed the 737-300/-400/-500s, they had to fit turbofans underneath the wings that were much larger in diameter than the turbojets.

That's why they "cut" the nacelle like this, to provide sufficient ground clearance.

The nacelles on the 737-600 to 737-900 have a similar "cut" but not that pronounced (different nacelle design).

skal

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Q: Why are the engines on a Boeing 737 not round?
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