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| The first fighter monoplane of canard or tail-first configuration
and one of the first with a retractable nosewheel
undercarriage, the single-seat S.S.4 designed by
Ing Sergio Stefanutti and built by the Societa Aeronautica
Italiana Ing A Ambrosini was among the most
innovative warplanes of its time. Of all-metal construction
and powered by a 960hp liquid-cooled 12-cylinder
Isotta-Fraschini Asso XI R.C.40 engine driving a threebladed
variable-pitch pusher propeller, the S.S.4 had a
proposed armament of one 30mm and twin 20mm
cannon. The sole prototype was flown for the first time on 7 March 1939, but was destroyed during its second
flight on the following day, when, after the starboard
aileron separated, the wing developed a high amplitude
oscillation and the aircraft entered a dive and
crashed. No further development was undertaken. The
following data are based on manufacturer's estimates.
| WEIGHTS |
| Take-off weight | 2446 kg | 5393 lb |
| Empty weight | 1800 kg | 3968 lb |
| DIMENSIONS |
| Wingspan | 12.32 m | 40 ft 5 in |
| Length | 6.74 m | 22 ft 1 in |
| Height | 2.48 m | 8 ft 2 in |
| Wing area | 17.50 m2 | 188.37 sq ft |
| PERFORMANCE |
| Max. speed | 540 km/h | 336 mph |
 | A three-view drawing (1663 x 1223) |
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