Assertion: engine's configuration | /r/HasAspect | larger displacements
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text: The standard straight-six configuration World War I aviation engines used by the German Empire's Luftstreitkräfte aircraft possessed even larger displacements, with the most-used Mercedes D.III family of liquid-cooled, dual ignition, SOHC-valvetrain inline-six engines having a massive 14.8 litres (903 cu in).