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Anonymous
In World War 1 and World War 2 radial engines for airplanes were popular because they were easy to maintain and service, because of their simplicity. They were mainly used in World War 2 by the navy for these reasons.
They aren't (or weren't) more widely used because they're large size made them difficult to make aerodynamic. Although this doesn't seem to have hurt planes like the F4U much.
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