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Vultee V-11 / YA-19

Vultee V-11 NX14999
The prototype Vultee V-11 Army attack bomber NX14999 c/n 28 first flw on 17 September 1935, piloted by T C Van Stone. It crashed on take-off for its second flight the next day, killing Van Stone and project engineer Duald L Blue.
Vultee V-11 NX14999
The second V11 prototype, but with 1800hp P&W R-2800 Double Wasp and three-blade prop, NX/NR/NC14980 c/n 29, first flew on 9 October 1935 as a demonstrator for the South America market.
Vultee V-11A NR14980
The second V11 prototype, built first as a V-11A, it was later modified as the fixed-gear V-11T for Pratt & Whitney's use in engine testing, first flying on 21 January 1940.
Vultee V-11T NC14980
Ultimately refitted with 2000hp R-2800, it was destroyed in a crash on 20 March 1945.
The V-11G and -11GB were versions with a 1000hp Wright SGR-1820-G2 Cyclone. The V-11G was a two-seater, and -11GB sat three (pilot, bombardier, gunner) with a retractable ventral gun position. One was built as a company test hack on wheels (NX/NR17327) and seven with a 1200hp P&W R-1830-17 went to the USAAC in 1939 for field testing as YA-19 (38-549 to 38-555.
Vultee V-11GB Ventral gun station
China ordered 30 two-seat Vultee V-11Gs in 1937-38 and then more Vultee V-12s (a more powerful variant) which they were planning to assemble from kits (25 were finished)
Four -11GB went to USSR (NR17328-17329 and 2 unregistered) along with some EDO sets to transform them into -11GBS seaplane and -11GBF floatplane attack bombers. Thirty-one more were built under license in the USSR, but later converted as mail carriers.
Forty -11GB went to Turkey redesignated -11GBT, and 26 -11GB to Brazil in 1938-39 as -11GB2, the last of which was modified with EDO floats as 11GB2F for the Brazilian Navy, as also was prototype NX21719 in hopes of civil sales, which didn't occur.
Vultee V-11GB2F
The aircraft had limited combat success with the Chinese, and a Brazilian Vultee V-11 made an attack on a submarine, damaging itself in the process. Later developments would have a rear facing gunner at the back of the cockpit plus a rear-facing ventral gun position protruding from the bottom. Most were later used as high speed liaison and transport aircraft. 
Second V11 prototype
Engine: 1800hp P&W R-2800 Double Wasp
Prop: three-blade
Wingspan: 50'0"
Length: 37'6"
Useful load: 3450 lb
Max speed: 232 mph
Cruise speed: 213 mph
Stall: 68
Range: 1220 mi
Engine: 750hp Wright SGR-1820
Prop: 2 blade
Wingspan: 50'0"
Length: 37'6"
Useful load: 3265 lb
Max speed: 229 mph
Cruise speed: 207 mph
Stall: 68 mph
Range: 1225 mi
Ceiling: 28,000'
Seats: 2
Engine: Wright SR-1820-F53
Time to 20,000ft: 14 min
Service ceiling: 27,000 ft
Absolute ceiling: 29,000 ft
Cruise: 220 mph
Top speed: 265 mph
Seats: 2

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