The Ambrosini SAI.403 Dardo was a light fighter aircraft built in Italy during World War II.
SAI.403 Dardo was a considerably refined version of the SAI.207, designed during the delays in that type’s development.
The improvements induced the Ministero dell’ Aeronautica in 1943 to cancel its order for 2,000 of the SAI.207 so as to order 3,000 of the SAI.403 instead (800 from Ambrosini, 1,000 from Caproni, and 1,200 from Savoia-Marchetti).
Apart from the fighter’s superlative performance, its all-wood construction was attractive at a time when Italy was facing a shortage of strategic materials.
However, by the time of the Armistice, the first of these was yet to leave the factory.
The single prototype (MM.518) was seized by the Germans and evaluated by the Luftwaffe at Vergiate.
Japanese pilots then stationed in Germany were also given a chance to fly the aircraft, with the result that it was ordered into production by both Heinkel and Mitsubishi.
None of these flew before the end of the war either.
SAI.403A, SAI.403B, SAI.403C.
Length: 8.2 m (26 ft 11 in)
Wingspan: 9.8 m (32 ft 2 in)
Height: 2.9 m (9 ft 6 in)
Wing area: 14.46 m2 (155.6 sq ft)
Empty weight: 1,893 kg (4,173 lb)
Max take off weight: 2,643 kg (5,827 lb)
Fuel capacity: 300 l (79 US gal; 66 imp gal) (Dardo-A / -B); 410 l (110 US gal; 90 imp gal) with 2 150 l (40 US gal; 33 imp gal) drop tanks (Dardo-C)
Power plant: 1 × Isotta-Fraschini Delta R.C.21/60 Serie I-IV inverted air-cooled V-12 piston engine, 560 kW (750 hp)
Propellers: 3-bladed constant-speed propeller
Maximum speed: 648 km/h (403 mph, 350 kn) at 7,200 m (23,600 ft)
Cruise speed: 490 km/h (300 mph, 260 kn)
Range: 935 km (581 mi, 505 nmi)
Ferry range: 2,320 km (1,440 mi, 1,250 nmi) with drop tanks (Dardo-C)
Service ceiling: 12,135 m (39,813 ft)
Rate of climb: 15.9 m/s (3,130 ft/min)
Time to altitude: 6,000 m (20,000 ft) in 6 minutes 40 seconds