inline engine
reciprocating engine arranged with cylinders in banks aligned with the crankshaft
straight-four engine
inline piston engine with four cylinders
straight-six
inline piston engine with six cylinders
U engine
inline engine with two parallel banks driving separate crankshafts
W engine
reciprocating engine with three banks of cylinders
straight-three
inline piston engine with three cylinders
straight-nine
inline piston engine with nine cylinders
straight-twin
inline piston engine with two cylinders
straight-seven
inline piston engine with seven cylinders
straight-eight
inline piston engine with eight cylinders
straight-five
inline piston engine with five cylinders
straight-ten
inline piston engine with ten cylinders
Walter Minor
inline piston aircraft engine family
straight-twelve
inline piston engine with twelve cylinders
Walter Major
1930s Czech piston aircraft engine range