| YA-19 | |
|---|---|
| Role | Ground attack |
| Manufacturer | Vultee |
| First flight | 27 January 1939 |
| Introduction | 1939 |
| Primary users | U.S. Army Air Corps Brazilian Army Aviation |
| Number built | 216 (all variants) |
The Vultee V-11 and V-12 were American attack aircraft of the 1930s. Developments of the Vultee V-1 single-engined airliner, the V-11 and V-12 were purchased by several nation's armed forces, including China, who used them in combat against Japanese forces in the Second Sino-Japanese War. The United States Army Air Corps purchased small numbers of the V-11 as the Vultee YA-19 in the years before World War II, testing them to gather data to compare against twin engine light attack planes.
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In 1935, Vultee produced a light bomber derivative of their single-engined passenger transport, the Vultee V-1, which, while demonstrating good performance, was only sold in small numbers owing to competition from larger twin-engined aircraft such as the Boeing 247 and Douglas DC-2 and increasing restrictions on the use of single-engined aircraft for scheduled passenger transport operations.[1]
The resulting aircraft, the Vultee V-11, retained the single-engined, low wing format and all-metal stressed skin structure of the V-1. It combined a new fuselage with accommodation for the two or three crew members under a long canopy with the wings and tail surfaces of the Vultee V-1.[2]
An initial order for 30 two-seat V-11Gs was placed by China before the end of 1935. This was followed by orders in 1939 for two versions (the V-12-C and V-12D) of the more powerful V-12 variant. The majority of these were planned to be assembled at the Central Aircraft Manufacturing Company factory at Loiwing near the China-Burma border,[3] and while the first batch of 25 V-12-Cs were completed successfully, the factory was heavily bombed just after assembly of the first V-12-Ds commenced. This resulted in the part built airframes being evacuated to India, where it was planned that the aircraft be completed at the Hindustan Aircraft Limited factory in Bangalore. However, after a few were assembled, production was stopped as the factory was diverted to more urgent overhaul work.[4]
The V-11s and V-12s that were available were used as light bombers to some limited success, including a mission to bomb the Japanese held airfield by 4 A-19's at Yuncheng on February 5, 1939 by the 10th Squadron of the Republic of China Air Force, before the aircraft were retired from frontline bombing missions to training and liaison duties in 1940.
In 1936, the Soviet Union purchased a single three-seat V-11-GB aircraft, together with a production license. The aircraft entered Soviet production in 1937 as the BSh-1 (Bronirovanny Shturmovik), but the armour fitted for the ground attack role resulted in inadequate performance and production was stopped after 31 aircraft. They were redesignated PS-43 and transferred to Aeroflot, who used them as high speed transports until the Germany invasion in 1941, when they were returned to the Air Force who used them for liaison purposes.[5][6]
In the late 1930s, the United States Army Air Corps favored twin engine light attack aircraft but seven YA-19 aircraft were ordered in the summer of 1938 for comparison purposes. YA-19s were armed with six .30 in (7.62 mm) machine guns and 1,080 lb (490 kg) bombs in internal bomb bay, powered by a 1,200 hp (895 kW) Twin Wasp radial engine and was manned by a crew of three - pilot, observer/gunner, and bombardier/photographer.
An interesting feature of the YA-19 design was its horizontal stabiliser located entirely forwards of the vertical tail. The vertical stabilizer caused directional instability (yaw axis) due to undersize. The last YA-19 (S/N 38-555) was equipped with enlarged vertical stabilizer for improvement of directional stability but performance was not significantly improved.
Service test proved that twin engine attack aircraft had higher speed and carried more armament and larger bomb load. As a result no further YA-19s were ordered. After comparison tests five YA-19s were redesignated A-19 and assigned to the 17th Attack Group at March Field in California for a brief period. Later were transferred to the Panama Canal Zone for utility transport and liaison duties. The USAAC A-19 was never used in combat and was quickly replaced by more capable attack aircraft in the early 1940s.
Data from USAF Museum[8]
General characteristics
Performance
Armament
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