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Continuing its highly successful Corsair biplane range, Vought produced in 1930 the new O3U-1 for the US Navy. This led to several new O3U observation and SU scouting types being produced, powered by Pratt & Whitney Wasp or Hornet radial engines in the 410-447kW range. All remained two-seaters, armed with one forward-firing 7.62mm and two rear-mounted machine-guns. Altogether nearly 330 were built, two-thirds as O3Us.
| MODEL | SU-4 Corsair |
| ENGINE | 1 x 447kW Pratt & Whitney R-1690-42 Hornet radial piston engine |
| WEIGHTS |
| Take-off weight | 2161 kg | 4764 lb |
| Empty weight | 1502 kg | 3311 lb |
| DIMENSIONS |
| Wingspan | 10.97 m | 35 ft 12 in |
| Length | 8.37 m | 27 ft 6 in |
| Height | 3.45 m | 11 ft 4 in |
| Wing area | 31.31 m2 | 337.02 sq ft |
| PERFORMANCE |
| Max. speed | 269 km/h | 167 mph |
| Ceiling | 5670 m | 18600 ft |
| Range | 1094 km | 680 miles |
| ARMAMENT | 3 x 7.62mm machine-guns |
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