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To increase climbing speed a Do C 2a was fitted with an additional smaller wing, becoming a sesqui-plane. First flown on September 18, 1931 from the Bodensee (a large lake at the borderline of Germany and Switzerland) the conversion was not generating the foreseen improvement and it was not put into production. The three-seat Do 3 was the direct predecessor to the Do 22 used in Finland and Yugoslavia. Engine: 725 hp Hispano-Suiza Max. speed: 146 mph (235 kmh) Climb: 755 ft (230 m)/min Ceiling: 18,045 ft (5,500 m) Weight: 5,952 lb (2,700 kg) Max. T/O: 7,275 lb (3,300 kg) Span: 49 ft 2.55 in (15.0 m) Length: 41 ft 8 in (12.7 m) Height: 15 ft 5.04 in (4.7 m) Wing Area: 480.1 sq.ft (44.6 sq.m).