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Macchi M.67
The Macchi M.67, was an Italian racing seaplane designed by Mario Castoldi and built by Macchi for the 1929 Schneider Trophy race.
==Design and development==
Castoldi based the design of the M.67, (a single-seat, low-wing, monoplane, twin-float floatplane), on that of the earlier Macchi M.39, which had competed for Italy in the 1926 and 1927 Schneider Trophy races, following the M.39s layout but strengthened to accommodate the 18-cylinder, , Isotta-Fraschini Asso 1000("Ace") 1000 W-18 engine, a much bigger and more powerful engine than the Fiat AS.2 V12 fitted to the M.39. The M.67 carried fuel in its floats; the powerful engine drove a three-bladed propeller which created a large amount of torque. To provide extra flotation allowing smaller floats, lighter structure and less drag, fuel was carried in integral tanks built into the floats. To counter the high torque from the propeller, more fuel was carried in one float than the other, reducing swing on take-off dramatically due to reduced asymmetric hydro-dynamic drag, but also causing high out of trim forces in roll when airborne.〔Vašiček 2002, p. 34.〕
Although the Italian public expressed a great deal of concern that the ''Asso'' 1000 engine was not ready for Schneider Trophy competition—Isotta-Fraschini built 27 of them for the 1929 Schneider Trophy race, but some exploded during testing—the Italian Air Minister, Italo Balbo (1896–1940), believed that the M.67 had the best chance of winning the race and selected it to represent Italy. Macchi built three M.67s.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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