06/30/2010. Remarks by Johan Visschedijk: "While living in Finland, the Russian engineer Boris Adaridin designed the single-seat AD 3 lightweight wooden aircraft and offered the plans to the Aviation Forces in Finland in May 1923. The Air Forces approved the construction of one undesignated example and in the autumn construction was started at the Santahamina (Sandhamn) near Helsinki.

Powered by a 12 hp Salmson AD.3 three-cylinder air-cooled radial engine, the maiden flight was made on April 17, 1924, carried out for the Aviation Forces by a German WW I ace (32 victories), Lieutenant E. Thuy. Although heavily underpowered, the aircraft had more or less satisfying flight characteristics, these being slightly improved by shifting the center of gravity forward.

In the summer of 1924 the aircraft was transferred to Utti military airfield, some 81 mls (130 km) north-east of Helsinki, later at Vehmaa military airfield, some 112 mls (180 km) west of Helsinki, were it was subsequently stored in 1931. Presently the sole AD 3 is preserved at the Finnish Aviation Museum."

Span: 39 ft 0.7 in (11.60 m)
Length: 17 ft 4.6 in (5.30 m)
Wing area: 145.3 sq.ft (13.5 sq.m)
Max T/O weight: 573 lb (260 kg)
Max speed: 66 mph (106 kmh)
Landing speed: 22 mph (35 kmh)
Service ceiling: 13,123 ft (4,000 m)