It's the belly of the fuselage I think. They are almost exactly the same size. The Swift is marginally faster on 45 fewer horses, but the RWD probably has it in rate of climb and aerobatic ability.
Evidently in testing a PZL P.11 was unable to shake the RWD in a mock dogfight.
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I'm not making it up as I go along, I'm establishing precedent
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