Macchi M.39

The Macchi M.39 was a racing seaplane designed and built by the Italian aircraft company Macchi Aeronautica in 1925–26. An M.39 piloted by Major Mario de Bernardi (1893–1959) won the 1926 Schneider Trophy, and the type also set world speed records that year.

Design and development

The M.39 was designed by Mario Castoldi (1888–1968) to represent Italy in the 1926 Schneider Trophy race, and it was the first low-wing monoplane that he designed for Macchi. It was a single-seat, twin-float racing seaplane, of mixed (metal and wooden) construction. The wooden wings were wire-braced, with two thirds of the upper surfaces used as low drag surface radiators. The pilot sat in an open cockpit parallel with the trailing edge of the wing; the cockpit's windscreen was profiled into the fuselage decking to reduce aerodynamic drag. The floats carried fuel.

The M.39 had features specializing it for Schneider Trophy competition. The course circuit required left turns, so the left wingtip was slightly farther from the fuselage than the right wingtip to allow it to make tighter left-hand turns. To counteract propeller torque reaction, the floats had unequal buoyancy.

M39

M39, M-39 or M.39 may refer to:

M-39 (Michigan highway)

M-39 is a state trunkline highway in Metro Detroit area of the US state of Michigan that runs from Lincoln Park, on the south end, to Southfield on the north. Most of it is known as the Southfield Freeway, a freeway that runs from Allen Park through the west side of Detroit to Southfield. The rest of the highway follows Southfield Road, a divided highway in the Downriver area. The official southern terminus of M-39 is at the corner of Southfield Road and Lafayette Boulevard in Lincoln Park, one block southeast of the junction of Interstate 75 (I-75, Fisher Freeway) and two blocks northwest of M-85 (Fort Street). From there the highway heads northward, transitions into a freeway and runs through Dearborn and Detroit. The northern terminus is at M-10 (Lodge Freeway) in Southfield.

The current M-39 is the third highway to bear the designation. The first dated back to the origins of the state highway system in 1919 and ran between Grand Rapids and Lansing. This highway was replaced in segments through the 1920s and 1930s by realignments or extensions of other highways in the area. The second was part of Schaefer Highway in the Detroit area from 1939 until the end of the 1950s. The current highway was commissioned when the M-39 designation was moved to Southfield Road from Schaefer Highway. During the 1960s, it was converted into a freeway in stages. Afterwards, it was extended to end at M-85 (Fort Street) before a change in the 1980s gave the trunkline its present termini.