SBU
A SBU-1 of Scouting Squadron 41
Role	Dive bomber Type of aircraft
National origin	United States
Manufacturer	Vought
First flight	May 1933
Primary user	United States Navy
Number built	125
Developed from	Vought XF3U
Developed into	Vought XSB3U

The Vought SBU-1 Corsair was a two-seat, all-metal biplane dive bomber built by Vought Aircraft Company of Dallas, Texas for the US Navy. Its design was based upon the F3U-1 two-seat fighter that was abandoned when the Navy decided not to obtain any more two-seat fighters.

Design and development

The aircraft was equipped with a closed cockpit, had fixed landing gear, and was powered by a Pratt & Whitney R-1535 radial air-cooled engine as had the F3U-1, but also included a controllable pitch propeller and a new NACA cowl with adjustable cowling gills on the trailing edge of the cowl. The adjustable cowling gills permitted better control of cooling airflow over the engine.

The SBU-1 completed flight tests in 1934 and went into production under a contract awarded in January 1935. The Corsair was the first aircraft of its type, a scout bomber, to fly faster than 200 mph. The last SBU Corsairs were retired from active service in 1941, being reassigned as trainers.^[1]

The name "Corsair" was used several times by Vought's planes; the O2U/O3U, SBU, F4U, and the A-7 Corsair II.

Operators

 Argentina

• Argentine Navy

 United States

• United States Navy

Variants

XF3U-1

Two-seat fighter prototype with a 700 hp R-1535-64 engine.^[2]

XSBU-1

The XF3U-1 converted to scout bomber prototype with a 700 hp R-1535-96 engine, later used as an engine test bed.^[3]

SBU-1

Original production order; 84 aircraft with 750 hp R-1535-82 engine.^[3]

SBU-2

Follow-on order; 40 aircraft with R-1535-98 engines.^[3]

Model V.142A

Export version for Argentina.^[3]

Specifications (SBU-1)

Data from United States Navy Aircraft since 1911 ^[4]

General characteristics

• Crew: two: pilot, navigator/gunner
• Length: 27 ft 10 in (8.49 m)
• Wingspan: 36 ft 3 in (10.14 m)
• Height: 11 ft 11 in (3.63 m)
• Wing area: 327 sq ft (30.4 m²)
• Empty weight: 3,645 lb (1,659 kg)
• Max takeoff weight: 5,520 lb (2,509 kg)
• Powerplant: 1 × Pratt & Whitney R-1535-80 Twin Wasp Junior 14-cylinder two-row air-cooled radial engine, 700 hp (522 kW)

Performance

• Maximum speed: 178 kn (205 mph, 330 km/h) at 8,900 ft (2,700 m)
• Cruise speed: 106 kn (122 mph, 196 km/h)
• Range: 477 nmi (548 mi, 882 km)
• Service ceiling: 23,700 ft (10,800 m)
• Rate of climb: 1,180 ft/min (6.0 m/s)

Armament

• Guns: 1x Fixed forward firing .30 in (7.62 mm) Browning machine gun and 1x machine gun flexibly mounted .30 in machine gun in rear cockpit
• Bombs: 1x 500 lb (227 kg) bomb