sentences:  It first appeared in 1937 and was initially powered by the Alfa Romeo 115-I engine of .At least one example was converted postwar with the de Havilland Gipsy Six Series II of .The aircraft was primarily of wooden construction, the fuselage being a wooden monocoque and the two-spar wing having a duralumin-covered centre-section built integral with the fuselage and internally reinforced with steel tubes.