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The ULPower UL260i, a flat-four engine produced by ULPower Aero Engines of Belgium. Flat-four engines are flat engines with four cylinders arranged horizontally in two banks of two cylinders on each side of a central crankcase; they can be used in cars, motorcycles, or aircraft. This type of engine tends to be well-balanced and have efficient cooling, but is expensive to manufacture and considerably wider than other engines.Photograph: ULPower Aero Engines
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