If you look at aircraft from the Second World War or earlier, you'll notice that many of them have engines with large frontal areas and cylinders arranged about the propeller crankshaft. This a radial ...

Bore and Stroke: 127 mm (5.0 in.) x 140 mm (5.5 in.) Charles Lawrance, originally a race car engine designer, built his first air-cooled aircraft engine in 1921 for a Navy contract. The 149 kW (200 hp ...