A new arrival is the Belgian D-Motor LF26, a compact 2.7-litre flat-four aero-engine that has direct drive to a propeller, rather than a reduction gearbox.
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Due to cooling and efficiency problems, flathead engines fell out of favor in "high power" applications, such as aircraft engines, prior to World War I, with rare execeptions like the American Aeronca E-107 opposed twin aero engine of 1930.
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The E-107A was a production aviation flathead engine designed to replace a Morehouse engine on the first prototype of the Aeronca C-2.