(Vultee) Vengeance @·AIRCRAFTUBE

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Vultee A-31 Vengeance

The Vultee A-31 Vengeance was an American dive bomber of World War II, built by Vultee Aircraft. A modified version was designated A-35. The Vengeance was not used operationally by the United States but was operated as a front-line aircraft by the British Royal Air Force, the Royal Australian Air Force, and the Indian Air Force in Southeast Asia and the Southwest Pacific. The A-31 remained in service with U.S. units until 1945, primarily in a target-tug role

Design and development

In 1940, Vultee Aircraft started the design of a single engined dive-bomber, the Vultee Model 72 (V-72) to meet the requirements of the French Armée de l'Air. The V-72 was built with private funds and was intended for sale to foreign markets. The V-72 was a low-wing, single-engine monoplane with a closed cockpit and a crew of two. An air-cooled radial Wright Twin Cyclone GR-2600-A5B-5 engine rated at 1,600 hp (1,200 kW) powered the V-72. It was armed with both fixed forward firing and flexible mounted .30 in (7.62 mm) machine guns in the rear cockpit. The aircraft also carried up to 1,500 lb (680 kg) of bombs in an interior bomb bay and on external wing racks.

The Vengeance was uniquely designed to dive vertically without lift from the wing pulling the aircraft off-target. To this end, it had a 0° angle of incidence on the wing to better align the nose of the aircraft with the target during the dive. This resulted in the aircraft cruising in a nose-up attitude giving a poor forward view for the pilot, particularly during landing. It had an unusual, "W"-shaped wing planform. This resulted from an error in calculating its centre of gravity. Moving the wing back by "sweeping" the centre section was a simpler fix than re-designing the wing root. This gives impression of an inverted gull wing when seen from an angle, when in fact the wing has a more conventional dihedral on the outer wing panels.

France placed an order for 300 V-72s, with deliveries intended to start in October 1940. The fall of France in June 1940 stopped these plans, but at the same time the British Purchasing Commission, impressed by the performance of the German Junkers Ju 87, was shopping for a dive bomber for the Royal Air Force, and as it was the only aircraft available, placed an order for 200 V-72s (named Vengeance by Vultee) on 3 July 1940, with orders for a further 100 being placed in December. As Vultee's factory at Downey was already busy building BT-13 Valiant trainers, the aircraft were to be built at the Stinson factory at Nashville, and under license by Northrop at Hawthorne, California.

The first prototype V-72 flew from Vultee's factory at Downey, California on 30 March 1941. Additional aircraft were ordered for Britain in June 1941 under the Lend-Lease scheme, with these being given the US Army Air Corps designation A-31.

After the U.S. entered the war following the attack on Pearl Harbor, a number of V-72 and A-31 aircraft were re-possessed for use by the Army Air Corps. As the Army Air Corps became interested in dive bombing, it decided to order production of an improved version of the Vengeance, designated the A-35, for both its own use and for supply to its allies under Lend-Lease. It was fitted with a more powerful Wright Twin Cyclone R-2600-19 engine and improved armament. As US Army test pilots disliked the poor pilot view resulting from the zero-incidence wing, this was "corrected" in the A-35, giving a better attitude in cruise but losing its accuracy as a dive bomber.

When production of the Vengeance was completed in 1944, a total of 1,931 aircraft had been produced. The majority were produced at the Vultee plant in Nashville, Tennessee.

Indecision about which aircraft type should replace it in production at the Vultee plant led to several "make-work" contracts for Vengeance aircraft to prevent dispersion of the skilled workforce. This resulted in overproduction of what was considered an obsolete aircraft.

Evaluation

Operational experience with other dive bomber aircraft of the period, such as the Blackburn Skua , Junkers Ju 87, Aichi D3A, Douglas SBD Dauntless, Breda Ba.65 and Curtiss SB2C Helldiver, indicated that the Vengeance would be vulnerable to enemy fighters. To be effective, all these aircraft required an environment of local air superiority and fighter escort. Fighter escort, lack of fighter opposition in the theatres in which it served, combined with its vertical dive capability meant that the Vengeance suffered light combat losses.

Early experience with the aircraft showed there were problems with engine cooling. In service, the British managed to solve these problems, but Free French aircraft that did not have these problems remedied were declared uneconomical and unreliable to operate and were grounded.

The aircraft was described as being stable in flight and in a dive, with heavy elevator and rudder control, but with light aileron control. Forward visibility was considered poor due to the large radial engine. There were a number of fatal accidents with the Vengeance due to improper dive procedures and a center of gravity problem when the aircraft was flown with the rear cockpit canopy open, but without a rear gunner.

In combat, the type was considered rugged, reliable, stable, and generally well-behaved. Commonwealth forces operated the type from May 1942-July 1944. Burma tended to be a low priority for Allied air planners, and forces in that theater got what was left over. Aircraft such as the Vickers Wellington and Hawker Hurricane spent their last days in Burma. The Vengeance saw considerable action attacking Japanese supply, communications and troop concentrations in Burma. Its service in that theater has been described as sterling. At best, the Vengeance was a qualified success in Burma, doing much to hold the line against Japanese advances.

Peter Smith, author of Jungle Dive Bombers at War (ISBN 0-7195-4425-4), recorded that:

"Their pilots had difficulty in getting them off the ground with a full load. At Newton Field they were using the full length of the 6,000 feet runway before becoming airborne. Kittyhawk aircraft could carry the same bomb load and in addition carry out ground-strafing".

In contrast, many crew spoke well of the Vengeance.

"I certainly didn't have that experience of the Vultee. I can recall no incidents of pilots having difficulty in taking off with full bomb loads, and the Kittyhawk could not carry the same bomb load even after their undercarriage had been strengthened. I remember the Vultee as a lovely aircraft to fly, an aircraft that was hard to stall and was fully aerobatic. You could do anything in them, rolls, loops, stall turns, and there was enough room in the cockpit to hold a ball. I used to like flying them, although a lot of blokes thought that they were too cumbersome."

Operational history

By the time Britain had received large numbers of Vengeances, its opinion on the usefulness of specialised dive bombers had changed; as the Battle of Britain and operations over North Africa had shown the dive bomber to be vulnerable to fighter attack, it rejected the Vengeance for use over Western Europe or the Mediterranean. It was decided to use the Vengeance in the Burma Theatre to carry out dive-bombing operations in close support of British and Indian troops in the jungles of Burma.

The first RAF squadrons (No. 82 and No. 110) received Vengeances in October 1942. The first dive bombing missions against Japanese forces were flown on 19 March 1943. A further two RAF squadrons in Burma received Vengeances, (No. 84 and No. 45), together with two squadrons of the Indian Air Force (IAF) (No. 7 and No. 8).

Vengeances were heavily deployed in support of the second Arakan campaign of 1943/44, and defending against the Japanese attacks on Imphal and Kohima of April–July 1944. Following the successful defeat of the Japanese attack, the RAF and IAF started to phase out the Vengeance in favour of more versatile fighter bombers and twin engined light bombers, with the last Vengeance operations over Burma being carried out on 16 July 1944.

After Burma service, a detachment from 110 Squadron RAF was sent to Takoradi in West Africa via the Middle East, a number of aircraft breaking down en route. Between September and December 1944, 11 Vultees took part in air-spraying trials against malarial mosquitoes, using underwing spray dispensers.

Although phased out of front line service with the RAF, it continued to receive large numbers of Vengeances, with bulk deliveries of Lend Lease aircraft (as opposed to those purchased directly by Britain) having only just started. Many of these surplus aircraft, including most Vengeance Mk IVs, were delivered to the UK and modified as Target tugs, being used in this role both by the RAF and the Royal Navy's Fleet Air Arm (FAA). In these roles, all armament was removed from the aircraft.

Australia placed an order for 400 Vengeances as an emergency measure following the outbreak of war in the Pacific, which was met by a mixture of Lend Lease and diversions from the original British orders. While the first Vengeance was delivered to the Royal Australian Air Force (RAAF) in May 1942, the aircraft did not arrive in substantial numbers until April 1943. The RAAF's first Vengeance squadron, No. 12 Squadron flew its first operational mission against Selaru Island in the Dutch East Indies. Squadrons equipped with the Vengeance included Nos. 12, 21, 23, 24 and 25 Squadrons. Of these, all but 25 Squadron served briefly in the New Guinea campaign. Australian Vengeances flew their last operational sorties on 8 March 1944, as they were considered less efficient than fighter bombers, having a short range and requiring a long runway, and were withdrawn to allow more effective fighter bombers to move into the forward area.

The view of the Vengeance's limitations is disputed by Peter Smith in Jungle Dive Bombers at War:

"The precision and skill of the dive-bombing method ..... and its clear superiority over most other means of air attack when it came to destroying small and well-hidden targets in difficult country, was proven over and over again in the Asian jungle campaigns. Yet the men who achieved these excellent results, for such economy of effort and comparatively small loss, were but a handful of pilots who have been forgotten in the overwhelming mass of the heavy-and medium bomber fleets that were pounding both Europe and Asia by 1945".

This capacity was exemplified in the raid by RAAF 21 and 23 Squadrons on Hansay Bay. Smith wrote in Jungle Dive Bombers at War, "...the jungle-clad hills and islands of forgotten or unknown lands would become the major stage for the ultimate expression of the dive-bombers' skill."

The Vengeance squadrons were re-equipped with Consolidated B-24 Liberator heavy bombers. While the RAAF still had 58 Vengeances on order in March 1944, this order was cancelled and the aircraft were never delivered. Small numbers of Vengeances remained in service with support and trials units until 1946.

Thirty-three V-72s and A-35s were supplied to Brazil from 1943, carrying out a few anti-submarine patrols. They were withdrawn by April 1948. The Free French Air Force received 67 A-35As and -Bs in 1943, being used to equip three bomb groups in North Africa. The French, however, keen to get the aircraft operational as soon as possible did not incorporate improvements found necessary by Britain and Australia, so their aircraft proved to be unreliable and had extremely high oil consumption. As such, they were restricted to training operations, being finally withdrawn in September 1944.

While the U.S. received 243 V-72s and A31s diverted from the RAF orders together with large numbers of A-35s specifically built for it, these saw no combat, being used as initial equipment for light bomber squadrons that re-equipped with twin-engined aircraft before deploying overseas, and as trainers or target tugs.

From April 1944, a number of Vengeance Mk IV series Is were made available to the 8th Air Force and assigned to target-towing flights and Combat Crew Replacement Centers (CCRC) stations. All armament was removed and a light cable winch fitted in the rear fuselage for sleeve towing. Some of these aircraft continued to be flown with British national markings and serial numbers. By late June 1944, there were seven A-35Bs at RAF Cluntoe, seven at Greencastle, 10 at RAF Sutton Bridge and six at RAF East Wretham. When the CCRCs were dissolved in the autumn, the A-35Bs were transferred to combat groups, most fighter and several bomber groups having one on charge at some time during 1945. A-35Bs did not show a high state of serviceability and were generally considered troublesome to maintain. They were also designated RA-35B (R for Restricted) by this time.

Survivors

One complete Vengeance IA that did not see squadron service, serial number A27-99 (EZ999), is displayed at the Camden Air Museum, New South Wales, Australia.

Variants

RAF Variants

  • Vengeance I : Vultee V-72 license built by Northrop and ordered directly for Britain, powered by 1,600 hp (1,200 kW) R-2600-A5B engine. 200 built.
  • Vengeance IA : Northrop built aircraft purchased under Lend-Lease, powered by 1,600 hp (1,200 kW) R-2600-19 engine, otherwise similar to Vengeance I. USAAF designation A-31-NO. 200 built.
  • Vengeance II : Vultee built aircraft directly purchased by Britain. Small differences from Vengeance I. 501 built.
  • Vengeance III : Vultee built Lend-Lease aircraft. Similar to IA. USAAF designation A-31-VN. 200 built.
  • Vengeance IV : A-35B supplied under Lend-Lease to RAF and RAAF. 458 supplied to RAF and 121 to RAAF.

US Variants

  • XA-31A : Redesignated prototype Vengeance accepted by USAAF in June 1942. Vultee designation V-88.
  • XA-31B : XA-31A modified as testbed for 3,000 hp (2,240 kW) Pratt & Whitney XR-4360-1 Wasp Major.
  • XA-31C : Vengeance III modified as testbed for 2,200 hp (1,640 kW) Wright R-3350-18 Duplex Cyclone engine. One converted.
  • YA-31C : Vengeance IIIs modified as testbeds for R-3350-17 engines for B-29 Superfortress. Five built.
  • A-35A : Redesigned version for USAAF and Lend-Lease. 4° wing incidence. Powered by 1,700 hp (1269 kW) R-2600-13 or -8 engine. Four forward-firing .50 in (12.7 mm) caliber M2 Browning machine guns and one in rear cockpit. Vultee designation V-88. 99 aircraft built.
  • A-35B : Modified aircraft with six forward-firing 0.50 in (12.7 mm) machine guns and additional bomb racks. 831 built.
  • TBV-1 Georgia : Aircraft in service with the U.S. Navy.

Operators

  • Australia : Royal Australian Air Force
  • Brazil : Brazilian Air Force
  • France : Free French Air Force
  • India British India : Indian Air Force
  • United Kingdom :
    • Royal Air Force
    • Fleet Air Arm
  • United States : U.S. Army Air Force

— — — = = — — —

This text is available under the Creative Commons Attribution-ShareAlike License
Source : Article Vultee A-31 Vengeance of Wikipedia ( authors )

Vultee A-31 Vengeance

  • Role : Dive bomber.
  • National origin : United States.
  • Manufacturer : Vultee Aircraft.
  • First flight : 30 March 1941.
  • Retired : September 1944.
  • Primary users :
    • United States.
    • United Kingdom.
    • Australia.
  • Number built : 1,931.

    • Specifications (Vengeance I)

  • Crew : 2 (pilot, navigator/gunner).
  • Length : 39 ft 9 in (12.12 m).
  • Height : 15 ft 4 in (4.67 m).
  • Wingspan : 48 ft (14.63 m).
  • Wing area : 332 ft² (30.84 m²).
  • Wing loading : 43.1 lb/ft² (210 kg/m²).
  • Empty weight : 9,725 lb (4,411 kg).
  • Max. takeoff weight : 14,300 lb (6,486 kg).
  • Maximum speed : 275 mph (239 kn, 443 km/h) at 11,000 ft (3,350 m).
  • Cruise speed : 235 mph (204 kn, 378 km/h).
  • Range : 1,400 miles (1,220 nmi, 2,253 km).
  • Service ceiling : 22,500 ft (6,860 m).
  • Power/mass : 0.11 hp/lb (0.18 kW/kg).
  • Powerplant : One Wright R-2600-A5B-5 Twin Cyclone 14 cylinder radial air-cooled engine.
  • Power : 1,600 hp (1,193 kW).
  • Armament:
    • Four fixed forward-firing .30 in (7.6 mm) Browning machine guns in the wing.
    • Two flexible mount .30 in (7.6 mm) or .303 in (7.7 mm) machine guns in rear cockpit[b].
    • Two internal 500 lb (230 kg) bombs.
    • Two 250 lb (110 kg) bomb on wing racks.

— — — = = — — —

This text is available under the Creative Commons Attribution-ShareAlike License
Source : Article Vultee A-31 Vengeance of Wikipedia ( authors )
Vultee A-31 & A-35 Vengeance : Your comments on this subject
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