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: 125 mm (4.92 in.) x 170 mm (6.69 in.) This engine was a double form of the Z9, which had nine cylinders. Salmson aircraft engines that were produced in France starting in 1913 by the ...