The L-440 air-cooled, six-cylinder, inverted, in-line engine was manufactured in the USA by the Ranger Aircraft Engine Division of Fairchild Engine and Airplane Corp. The design dates from the early 1930s. The Ranger 6 evolved from the Cirrus air-cooled, in-line engine designed in 1928. Considerable research went into the design of the close-fitting baffles around…