The Curtiss Model K 12 Cylinder Airplane Engine
This engine, of the fixed cylinder type, consists of twelve cylinders arranged in two groups of six each, with an included angle of 60 deg. The bore is 4½ in. and the stroke 6 in., the displacement of one cylinder being 95.4 cu. in. or 1.56 liters, and the total displacement 1144.8 cu. in. or 18.80 liters.