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At what minimum speed was the S.S.3 canard controllable?
Short answer
The SS.3 Anitra's stall speed was 34 mph (55 km/h). Its top speed, with a 16 hp (12 kW) engine, was 87 mph (140 km/h). It first flew on 2 October 1937 and was officially presented in Milan, at an international aeronautical exhibition.

A small 16 hp aircraft
The SS.3 Anitra had a wingspan of 12.77 m (41.9 ft), a length of 6.00 m (19.7 ft) and an overall height of 2.01 m (6.6 ft). Its powerplant was a 16 hp (12 kW) engine. With it, it reached a top speed of 87 mph (140 km/h) and could climb to an altitude of 13,120 ft (4,000 m).
Stall at 55 km/h
Stall speed was 34 mph (55 km/h). The aircraft first flew on 2 October 1937 and was officially shown in Milan, at an international aeronautical exhibition.
The SS.4, a canard fighter
The Ambrosini SS.4 was a single-seat fighter of all-metal construction with a canard wing configuration, two fins at the wing trailing edges, retractable tricycle gear and a short fuselage with the rear-mounted engine driving a pusher propeller. Its first flight took place on 7 March 1939.
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