XO-28

O2U-1
two prototypes followed by 130 production aircraft for USN with interchangeable wheel/float landing gear and 28 aircraft for other customers. 450 hp (336 kW) Pratt & Whitney R-1340-88 Wasp engine

O2U-2
37 built, increased span and larger rudder

Vought O2U-2 Corsair aircraft, of Marine Corps Scouting Squadron 14 (VS-14M) fly past
USS Saratoga (CV-3) while preparing to land on board, circa 1930.
[Source: U.S. Navy Photo]

O2U-4
43 built (1 for export. Also seven civilian O2U were built), similar to O2U-3 but with equipment changes

O3U-1
87 built, incorporating Grumman amphibious float

O3U-2
29 built, strengthened airframe, Pratt & Whitney R-1690 Hornet engine

O3U-3
76 built, 550 hp (410 kW) Pratt & Whitney R-1340-12 Wasp engine.

O3U-4
65 built, Pratt & Whitney R-1690-42 Hornet engine.

XO3U-5
test aircraft with Pratt & Whitney R-1535 engine

XO3U-6
test aircraft converted from O3U-3 with NACA cowling and enclosed cockpits

O3U-6
32 built, 16 with Pratt & Whitney R-1340-12 Wasp and 16 with Pratt & Whitney R-1340-18 Wasp engines

A U.S. Navy Vought O3U-6 Corsair (Bu A9737) at NACA, Langley, VA, on April 26, 1930.
This example was flown by the NACA for evaluation and cowling tests.
This Corsair came from the Naval Reserve squadron at Naval Air Station Anacostia, WA.
[Source: NACA Photo]

SU-2
Scout version of the O3U based on the O3U-4, 53 built

Three U.S. Marine Corps Vought SU-2 Corsair aircraft from
Marine observation squadron VO-8M in flight, circa 1934.
[Source: U.S. Navy Photo]

XSU-4
SU-2 converted as a prototype SU-4 variant with a 600 hp R-1690-42 engine, later became an SU-4.

SU-4
SU-4 re-engined with a 600 hp R-1690-2 engine, 41 built
One United States Navy O2U-3 evaluated by the United States Army Air Corps.

Vought V-65B
Export version for Brazil - 36

Vought V-65C
Export version for Nationalist China

Vought V-65F
Export version for Argentine Navy

Vought V-66B
Export version for Brazil

Vought V-66E
Export version, one evaluated by the Royal Air Force

Vought V-66F
Export version for Brazil - 15, and Argentine Navy

Vought V-80F
Export version for Argentine Navy

Vought V-80P
Export version for Peruvian Air Force

Vought V-85G
Export version for Germany

Vought V-92C
Export version for Nationalist China

Vought V-93S
Export version of the O3U-6 for Thailand

Vought V-99M
Export version for Mexico TNCA Corsario Azcárate
31 O2U-4A aircraft built under license in Mexico.

Vought AXV1
A single O2U supplied to the Imperial Japanese Navy Air Service for evaluation in 1929.