Douglas TBD Devastator
The Douglas TBD Devastator was an American torpedo bomber of the United States Navy. Ordered in 1934, it first flew in 1935 and entered service in 1937. At that point, it was the most advanced aircraft flying for the Navy and possibly for any navy in the world. However, the fast pace of aircraft development quickly caught up with it, and by the time of the Japanese attack on Pearl Harbor the TBD was already outdated.
|US Navy TBD-1 Torpedo Squadron Six (VT-6), from USS Enterprise (CV-6), in about 1938|
|National origin||United States|
|Manufacturer||Douglas Aircraft Company|
|First flight||15 April 1935|
|Introduction||3 August 1937|
|Retired||1942 (from active service)|
|Primary user||United States Navy|
The Devastator performed well in some early battles, but earned notoriety for its catastrophically poor performance in the Battle of Midway, in which the 41 Devastators launched during the battle produced zero torpedo hits and only six survived to return to their carriers. Vastly outclassed in both speed and maneuverability by the Mitsubishi Zero fighters they faced, most of the force was wiped out with little consequence except to distract the Zeros from the much more capable (and survivable) SBD Dauntless dive bombers that eventually sank four Japanese carriers and a heavy cruiser. Although a small portion of the Devastator's dismal performance was later attributed to the many well-documented defects in the US Mark 13 torpedo, the aircraft was immediately withdrawn from frontline service after Midway, being replaced by the Grumman TBF Avenger.
Design and developmentEdit
Ordered on 30 June 1934, and entered into a US Navy competition for new bomber aircraft to operate from its aircraft carriers, the Douglas entry was one of the winners of the competition. Other aircraft ordered for production as a result of the competition included the Brewster SBA, the Vought SB2U Vindicator, and the Northrop BT-1 which would evolve into the SBD Dauntless.[N 1]
The XTBD Devastator, which flew for the first time on 15 April 1935, marked a large number of "firsts" for the US Navy. It was the first widely used carrier-based monoplane as well as the first all-metal naval aircraft, the first with a totally enclosed cockpit, the first with power-actuated (hydraulically) folding wings and in these respects the TBD was revolutionary. A semi-retractable landing gear was fitted, with the wheels designed to protrude 10 in (250 mm) below the wings to permit a "wheels-up" landing which might limit damage to the aircraft. A crew of three was normally carried beneath a large "greenhouse" canopy almost half the length of the aircraft. The pilot sat in front; a rear gunner/radio operator took the rearmost position, while the bombardier occupied the middle seat. During a bombing run, the bombardier lay prone, sliding into position under the pilot to sight through a window in the bottom of the fuselage, using the Norden Bombsight.
The normal TBD offensive armament consisted of either a 1,935 lb (878 kg) Bliss-Leavitt Mark 13 aerial torpedo or a 1,000 lb (450 kg) bomb, to be carried semi-recessed into a fuselage bomb bay. Alternatively, three 500 lb (230 kg) general-purpose bombs (one under each wing root and one inside the bomb bay), or twelve 100 lb (45 kg) fragmentation bombs (six under each wing root), could be carried. This weapons load was often used when attacking Japanese targets on the Gilbert and Marshall Islands in 1942. Defensive armament consisted of a .30 in (7.62 mm) Browning machine gun for the rear gunner. Fitted in the starboard side of the cowling was either a .30 in (7.62 mm) or .50 in (12.7 mm) M2 Browning machine gun.
The powerplant was a Pratt & Whitney R-1830-64 Twin Wasp radial engine of 850 hp (630 kW), an outgrowth of the prototype's Pratt & Whitney XR-1830-60/R-1830-1 of 800 hp (600 kW). Other changes from the 1935 prototype included a revised engine cowling and raising the cockpit canopy to improve visibility.
The XTBD had a flat canopy that was replaced on production models by a higher, domed canopy over a rollover bar. Other than requests by test pilots to improve pilot visibility, the prototype easily passed its acceptance trials that took place from 24 April-24 November 1935 at NAS (Naval Air Station) Anacostia and Norfolk bases. After successfully completing torpedo drop tests, the prototype was transferred to the USS Lexington for carrier certification. The extended service trials continued until 1937 with the first two production aircraft retained by the company exclusively for testing.
A total of 129 of the type were purchased by the US Navy's Bureau of Aeronautics (BuAer), and starting from 1937, began to equip the carriers USS Saratoga, Enterprise, Lexington, Wasp, Hornet, Yorktown and Ranger. In prewar use, TBD units were engaged in training and other operational activities and were gradually approaching the end of their useful service life with at least one aircraft being converted to target tug duty. By 1940, the US Navy was aware that the TBD had become outclassed by the fighters and bombers of other nations and a replacement [N 2] was in the works, but it was not yet in service when the US entered World War II. By then, attrition had reduced their numbers to just over 100 aircraft. The US Navy assigned popular names to its aircraft in late 1941, and the TBD became the Devastator, although its nickname "torpecker" was commonly used.
The TBD is prominently featured in the 1941 film Dive Bomber.
In the early days of the Pacific war, the TBD acquitted itself well during February and March 1942, with TBDs from Enterprise and Yorktown attacking targets in the Marshall and Gilbert Islands, Wake and Marcus Islands, while TBDs from Yorktown and Lexington struck Japanese shipping off New Guinea on 10 March. In the Battle of the Coral Sea Devastators helped sink the Japanese aircraft carrier Shōhō on 7 May, but failed to hit another carrier, the Shōkaku, the next day.
Faults were discovered with the Mark 13 torpedo at this point. Many were seen to hit the target yet failed to explode; there was also a tendency to run deeper than the set depth. It took over a year for the defects to be corrected. These problems were not fixed by the time of the Battle of Midway on 4 June 1942.
At Midway, a total of 41 Devastators, the majority of the type still operational, were launched from Hornet, Enterprise and Yorktown to attack the Japanese fleet. The sorties were not well coordinated, in part because Rear Admiral Raymond A. Spruance ordered a strike on the enemy carriers immediately after they were discovered, rather than spending time assembling a well-coordinated attack involving the different types of aircraft – fighters, bombers, torpedo planes – reasoning that attacking the Japanese would prevent a counterstrike against the US carriers. The TBDs from Hornet and Enterprise lost contact with their escort and started their attacks without fighter protection.
The Devastator proved to be a death trap for its crews: slow and hardly maneuverable, with poor armor for the era; its speed on a glide-bombing approach was a mere 200 mph (320 km/h), making it easy prey for fighters and defensive guns alike. The aerial torpedo could not even be released at speeds above 115 mph (185 km/h). Torpedo delivery requires a long, straight-line attack run, making the aircraft vulnerable, and the slow speed of the aircraft made them easy targets for the Mitsubishi A6M Zeros. Only four TBDs made it back to Enterprise, none to Hornet and two to Yorktown, without scoring a torpedo hit.
Nonetheless, their sacrifice was not completely in vain, as several TBDs managed to get within a few ship-lengths range of their targets before dropping their torpedoes, being close enough to be able to strafe the enemy ships and force the Japanese carriers to take sharp evasive maneuvers. By obliging the Japanese to keep their flight decks clear and to continually cycle and reinforce their combat air patrols, they prevented any Japanese counter-attacks against the American carriers, just as Spruance had anticipated. These windows of opportunity were exploited by the late-arriving Douglas SBD Dauntless dive bombers led by Lieutenant Commander C. Wade McClusky and Max Leslie, which dive-bombed and fatally damaged three of the four Japanese carriers about one hour after the first TBD torpedo attacks had developed. While the Devastators faced the stiff defenses of the carriers and their fighters, their attacks served to distract the Japanese attention from the Dauntless dive bombers' strikes, resulting in relatively lighter resistance from the IJN carriers' defensive fighter patrols, and more effective American attacks that crippled the IJN carrier forces.
The Navy immediately withdrew the 39 remaining TBDs from frontline units after the debacle at Midway. The surviving Devastators in VT-4 and VT-7 remained in service briefly in the Atlantic and in training squadrons until 1944. Many were relegated to training duties for pilots and mechanics or were destroyed following use as instructional airframes for firefighting training. By late 1944, no TBD Devastators were left in the US Navy inventory. The original prototype finished its career at NAS Norman, Oklahoma; the last TBD in the US Navy was used by the Commander of Fleet Air Activities-West Coast. When his TBD was scrapped in November 1944, there were no more. None survived the war and there are none known to exist on dry land today.
In fairness to the Devastator, the newer TBF Avengers were similarly ineffective in 1942, losing five out of six aircraft without scoring a hit during the Battle of Midway. The Avengers' only successes in 1942 would be against the light carrier Ryūjō and the battleship Hiei [N 3] In the initial part of the Pacific War, the poor performances of US torpedo bombers was due to the vulnerability of that type in general against fire from anti-aircraft artillery and defending fighters, plus the inexperience of American pilots and lack of coordinated fighter cover, as well as serious defects in US torpedoes which were not discovered and corrected until the fall of 1943. It took growing American air superiority, improved attack coordination, and more experienced pilots, before the Avengers were able to successfully accomplish their roles in subsequent battles against Japanese surface forces.
- Prototype powered by a 800 hp (600 kW) XR-1830-60, one built.
- Production variant powered by a 850 hp (630 kW) R-1830-64, 129 built.
- One TBD-1 modified with twin floats.[N 4]
- United States Navy
- VT-2 used 58 Devastators between December 1937 and May 1942.
- VT-3 used 71 Devastators between October 1937 and June 1942. They starred in the 1941 movie Dive Bomber.
- VT-4 used nine Devastators between December 1941 and September 1942.
- VT-5 used 57 Devastators between February 1938 and June 1942.
- VT-6 used 62 Devastators between April 1938 and June 1942.
- VT-7 used 5 Devastators between January 1942 and July 1942.
- VT-8 used 23 Devastators between September 1941 and June 1942.
- VB-4 used three Devastators between December 1941 and January 1942.
- VS-42 used three Devastators between December 1940 and December 1941.
- VS-71 used eight Devastators between December 1940 and June 1942.
- VS-72 used two Devastators in June 1941.
- VU-3 used a single Devastator from January until May 1940.
- United States Marine Corps
- VMS-2 used a single Devastator, BuNo. 1518, from 26 March 1941 till 5 June 1941, loaned from VT-3.
There are no surviving aircraft in museums or private collections, nor are there any currently under restoration. However, below are four crashed aircraft that are known to exist and are the closest to a complete airframe in the world. It is not known if anyone will recover and restore these aircraft, as there has been no news on the discovery off San Diego since 2011. Note that these aircraft exist in varying degrees of intactness due to circumstances of their loss and subsequent saltwater corrosion. For example, the pair at Jaluit, a shallow warm-water atoll, have reef creatures growing on their exteriors; several of those lost at Coral Sea have broken wings and fuselages due to avgas explosions and their free-fall to the deep sea floor.
- TBD-1, Bureau Numbers 0298 and 1515
- Ex-VT-5 / USS Yorktown (CV-5) "5-T-7", "5-T-6" Jaluit Lagoon, Marshall Islands. 
- TBD-1 BuNo 0353
- Ex-NAS Miami, Atlantic Ocean, Miami, Florida.
- TBD-1 BuNo 0377
- Ex-VT-2 / USS Lexington (CV-2) "6-T-7", Pacific Ocean, Mission Beach, California.
- Wreck of the USS Lexington (CV-2)
On 4 March 2018 Paul G. Allen's R/V Petrel team discovered the wreck of the USS Lexington at 3,000 meters (about two miles) below the surface, resting on the floor of the Coral Sea more than 500 miles off the eastern coast of Australia. Near the wreck were the remains of seven Devastators, as well as an F4F-3 Wildcat.
Data from Devastator...The Not-so-Devastating TBD-1
- Crew: 3: (Pilot, Torpedo Officer/Navigator, Radioman/Gunner)
- Length: 35 ft 0 in (10.67 m)
- Wingspan: 50 ft 0 in (15.24 m)
- Height: 15 ft 1 in (4.60 m)
- Wing area: 422 sq ft (39.2 m2)
- Empty weight: 5,600 lb (2,540 kg)
- Gross weight: 9,289 lb (4,213 kg)
- Max takeoff weight: 10,194 lb (4,624 kg)
- Powerplant: 1 × Pratt & Whitney R-1830-64 Twin Wasp 14-cylinder two-row air-cooled radial piston engine, 900 hp (670 kW)
- Propellers: 3-bladed variable-pitch propeller
- Maximum speed: 206 mph (332 km/h, 179 kn) at 8,000 ft (2,400 m)
- Cruise speed: 128 mph (206 km/h, 111 kn)
- Range: 435 mi (700 km, 378 nmi) Mk. XIII Torpedo
- 716 mi (622 nmi; 1,152 km) with 1,000 lb (450 kg) of bombs
- Service ceiling: 19,500 ft (5,900 m)
- Rate of climb: 720 ft/min (3.7 m/s)
Notable appearance in mediaEdit
Dive Bomber (1941) was an American film directed by Michael Curtiz. It is notable for both its Technicolor photography of pre-World War II United States Navy aircraft featuring the TBD Devastator, and scenes on the aircraft carrier Enterprise as well as the NAS North Island in San Diego.
The 2014 film Against the Sun depicts a real-life story of the survival of a Devastor's crew after it had to ditch due to running out of fuel. The crew survived 34 days adrift.
Aircraft of comparable role, configuration and era
- Douglas XTB2D Skypirate
- Fairey Albacore
- Great Lakes XTBG
- Grumman TBF Avenger
- Nakajima B5N
- Nakajima B6N
- Yokosuka B4Y
- The Great Lakes XB2G, Great Lakes XTBG, Grumman XSBF, Hall XPTBH and Vought XSB3U were also tendered to the specification but were not developed beyond prototype status.
- the TBF Avenger
- The Hiei had already been crippled the night before.
- In 1939, the first production TBD was test flown with floats at Newport, Rhode Island.
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