The 1934 Vought V-135 NX15949 was a single place, open-cockpit biplane engine test-bed based on the O3U. It was powered by a P&W Twin Wasp and other engines.
Biplane
Vought VE-135
The 1934 Vought VE-135 NX15949 was a single-seat, open-cockpit biplane military prototype.
Vought VE-10 Bat Boat

The Vought VE-10 Bat Boat of 1919 was a three-place open-cockpit flying boat built for USN trials. The only flying boat ever built by Vought, it was unsuccessful. Only the one was built.
Engine: 90hp Curtiss OX-5
Speed: 80 mph
Seats: 3
Vought V-97 Corsair
One Vought V-97 Corsair was built in 1936 as a two-place cabin biplane observation aircraft. Powered by a 1000hp P&W Twin Wasp engine, it went to Mexico.
Vought V-70-A Corsair

In 1933 Vought built a two-place V-70-A Corsair NX781N c/n 892 company demonstrator based on the O3U.
Vought SBU / V-142

The Vought SBU was a scouting design modified from a two-place fighter. Exports to Argentina were designated V-142. The 1934 XSBU-1 prototype 9746 was rebuilt and modified from an XF3U-1.
Eighty-four SBU-1 were built in 1935: 9750-9833.

Forty SBU-2 built in 1937 featured a modified engine; 0802-0841.

SBU / V-142
Engine: 700hp P&W R-1535
Wingspan: 33’3″
Length: 27’10”
Useful load: 1739 lb
Max speed: 208 mph
Stall: 65 mph
Range: 902 mi
Ceiling: 24,400′
Seats: 2
Vought XSB3U-1

The 1936 Vought XSB3U-1 was an SBU development with a rearward-retracting gear. Only one was built, 9834.
Vought VE-9

In 1921 Vought built two VE-9, AS64310 and AS64316, for the Army. They were effectively VE-7 with a 180hp Wright E-3 engine.

In 1927 twenty-two were built foe the Army, 22-379 – 22-400, and seventeen to the USN, A6465-6481. The Army used same designation as USN.
Four VE-9H were built in 1927 for the USN, A6461-6464.
The VE-9W was cancelled.
1921 VE-9
Engine: 180hp Wright E-3
1927 VE-9
Wingspan: 34’2″
Length: 24’2″
Useful load: 536 lb
Speed: 119 mph
Ceiling: 18,840′
Vought VE-8
The VE-8 was a 1918 two-place, open cockpit biplane.
Two Vought VE-8 were ordered by the Army on 11 October 1918, 40099 and 63266, and three more were cancelled, 40100-40102.
VE-8
Engine: 340hp Hispano H
Wingspan: 31’9″
Length: 21’4″
Seats: 2
Vought VE-7 Bluebird / Lewis & Vought VE-7

The two-place Lewis & Vought VE-7 Bluebird of 1917 was advertised post-WW1 as a sport and training plane. One prototype was built. The wings and tail of the prototype were located in a hangar after WW2, and rebuilt into Waterman Pusher).

The VE-7 was built in 1918 (The first production aircraft of Chance Vought) as an advanced military trainer, observer, and fighter. Fourteen went to the USAS including AS19898-19902 and AS40072 (One of two known to have been built at McCook Field). Reportedly four more were built by Springfield Co and possibly never assigned s/ns.) There were conversions to VE-7G, 7GS, and -7S.
The USN received twenty VE-7, A5661-5680, plus 39 built by NAF, A5942-5969, A5971, and A6011-6020.

Forty of the 1921 VE-7F were built, A5912-5941, and A6021-6030, plus 29, A5943-5971, by NAF. They were powered by 180hp Wright E-3 engines.
In 1921 twenty-three VE-7, A5681-5700 were converted to VE-7G by NAF with 180hp Hispano E engines and one was modified, A5685, as a VE-7GF.

NAF built nine VE-7H, A6436/6444, with 180hp Hispano E engines for the USN in 1924.
In 1925 forty VE-7S were built for the AAF plus eleven to the USN, A5942 and A6011-6020, as VE-7SF, and one, A5680, as VE-7S converted from a VE-7 by NAF.

A VE-7 was the first aircraft to fly from an aircraft carrier.
A scratch-built replica of the Bluebird was completed in early 2007 by volunteers of the Vought Aircraft Heritage Foundation.
VE-7 Bluebird prototype
Engine: 150hp Wright-Hispano A
Wingspan: 34’2″
Length: 24’6″
Useful load: 536 lb
Speed: 114 mph
Seats: 2
VE-7F
Engine: 180hp Wright E-3
Wingspan: 34’1″
Length: 24’5″
Speed: 119 mph
Ceiling: 19,200′
VE-7G
Engine: 180hp Hispano E
VE-7GF
Engine: 180hp Hispano E
VE-7H
Engine: 180hp Hispano E
Length: 31’1″
Speed: 110 mph
Ceiling: 14,800′
VE-7S
Engine: 180hp Hispano E
Length: 24’5″
Speed: 117 mph
Range: 290 mi
Ceiling: 15,000′
Seats: 1
VE-7SF
Engine: 180hp Hispano E
Length: 24’5″
Speed: 117 mph
Range: 290 mi
Ceiling: 15,000′
Seats: 1