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Douglas XTB2D Skypirate

Prototype Heavy Torpedo Bomber Aircraft [ 1945 ]

Only two of the proposed Douglas XTB2D Skypirate torpedo bombers were built before the project saw cancellation in 1947.

Authored By: Staff Writer | Last Edited: 02/26/2020 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

Throughout World War 2 (1939-1945), the United States Navy pushed its ever-growing stable of carrier-based aircraft to all-new heights, branching from dedicated fighters to include an inventory stocked with versatile fighter-bomber types and even more dedicated, advanced bombing platforms in the dive and torpedo bomber molds. As American carriers grew in size, they were able to accept larger aircraft on their stronger, more spacious decks and one of the most famous of these large aircraft to emerge at the end of the war became the storied Douglas A-1 "Skyraider" of 1946 (detailed elsewhere on this site).

Back in 1942, the Midway-class carrier was in development and this design brought about the flexibility for Navy warplanners to include larger aircraft designs on the planned deck space. Authorities initially approached a design with a twin-engine configuration for the power necessary to undertake the torpedo bomber role with reconnaissance and level bombing capabilities as secondary. The design would be able to carry several torpedoes into battle, broadening the tactical appeal of the torpedo bomber when compared to wartime contemporaries (these limited to a sole torpedo).

During November of 1942, the United States Navy (USN) contracted with Douglas Aircraft Corporation to design, develop, and produce their new bomber. The project received the necessary steam to forge ahead in late October 1943 when a contract was signed for two flyable prototypes (the second to receive a slightly lengthened fuselage) and a static testbed to be designated "XTB2D-1" under the name of "Skypirate".

The twin-engine approach was ultimately dropped as Douglas engineers (a team that included famous American aviation engineer Ed Heinemann) went to work, instead utilizing a single-engine approach of considerable power. This became the Pratt & Whitney XR-4360-8 supercharged radial piston engine of 3,000 horsepower driving a pair of 14.3-foot diameter, four-bladed propeller units in a contra-rotating fashion. An internal bomb bay was part of the original design plans as well while a rear turret would be used to defend against trailing aerial threats. A rather modern tricycle undercarriage was fitted to allow the large blades the necessary clearance while also simplifying ordnance loading/reloading. The nose leg featured a telescoping strut to reduce its length when retracted into its bay as well as a twin-wheel configuration to contend with the rigors of carrier deck service. A three-man crew would operate the various onboard systems and their stations were fully armored for low-altitude combat flying. The tail unit relied on a single, large-area rudder complimented by very low-mounted horizontal planes. This section also carried the arrestor gear.

The wing mainplanes were given considerable attention during the design phase. They folded outboard of the main landing gear legs for optimal carrier storage and fuel was stored across four major compartments inboard and outboard of the legs. Each wing held two hardpoints for carrying 2,100 lb torpedo loads (or conventional drop ordnance equivalent). Outboard hardpoints were further plumbed for jettisonable fuel tanks which could be used to increase operational ranges. Each wing was also outfitted with 2 x 0.50 caliber Browning M2 heavy machine guns for forward strafing of ground targets. Full-span slotted flaps, automatically adjustable in flight and inboard sections doubling as ailerons, and an anti-icing feature were also part of the rather advanced design.

The Firestone company provided the dorsal turret works which installed 2 x 0.50 caliber M2 Browning heavy machine guns. The turret was fitted at the middle of the aircraft with the cockpit ahead. A ventral structural fairing was planned below and this station was to showcase an observation window as well as remotely-controlled 2 x 0.50 caliber Browning M2 heavy machine guns fixed to fire rearwards with a limited elevation span.

Inspection of a mockup was given in early 1943 as the war in Europe and the Pacific raged on. Sufficiently impressed, the Navy service awarded Douglas a contract for twenty-three aircraft based on the work displayed. However, the program continually suffered delays and general disinterest as propulsion gear was slow to be delivered and serial production not ready heading into the middle of 1944. Some development on the design did continue for a Skypirate prototype finally made it airborne on March 13th, 1945 - though this airframe lacked its dorsal turret and ventral fairing.

By this time, Japanese naval superiority was long gone and the fighter-bombers aboard existing American carriers proved more than sufficient to content with a dwindling enemy presence by the summer of 1945. With little need for such a large and expensive combat system, the XTB2D project faltered mightily. It was given its death blow with the Japanese surrender in August of 1945. What little testing had been completed on the Skypirate showcased issues with the wings, engines, and propellers and only added to the program's woes. While some thought was given to modifying the Skypirate as a dedicated long-range, high-altitude reconnaissance platform and even as a jet testbed, neither scenario panned out, signaling the formal end of the Skypirate project in 1947.©MilitaryFactory.com
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Douglas Aircraft Company - USA
United States (cancelled)
Operators National flag of the United States
Service Year
United States
National Origin
Project Status

Ability to conduct aerial bombing of ground targets by way of (but not limited to) guns, bombs, missiles, rockets, and the like.
Equipped to search, track, and engage enemy underwater elements by way of specialized onboard equipment and weapons.
Land-based or shipborne capability for operating over-water in various maritime-related roles while supported by allied naval surface elements.
Aircraft developed for the role of prototyping, technology demonstration, or research / data collection.

45.9 ft
(14.00 meters)
70.0 ft
(21.35 meters)
22.6 ft
(6.88 meters)
18,409 lb
(8,350 kilograms)
Empty Weight
28,550 lb
(12,950 kilograms)
Maximum Take-Off Weight
+10,141 lb
(+4,600 kg)
Weight Difference

1 x Pratt & Whitney R-4360-8 "Wasp Major" radial piston engine developing 3,000 horsepower.
339 mph
(545 kph | 294 knots)
Max Speed
24,442 ft
(7,450 m | 5 miles)
1,252 miles
(2,015 km | 1,088 nm)
1,390 ft/min
(424 m/min)

MACH Regime (Sonic)
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030

4 x 0.50 caliber Browning M2 heavy machine guns in wings (two per wing).
2 x 0.50 caliber Browning M2 heavy machine guns in rear dorsal turret (never fitted).
2 x 0.50 caliber Browning M2 heavy machine guns in remote-controlled ventral weapons station (never fitted).

Up to 4 x 2,100lb torpedoes or equivalent in conventional drop stores. Outboard underwing hardpoints plumbed for fuel tanks.


XTB2D "Skypirate" - Base Series Designation
XTB2D-1 - Prototype designation; two aircraft completed.

General Assessment
Values are derrived from a variety of categories related to the design, overall function, and historical influence of this aircraft in aviation history.
Overall Rating
The overall rating takes into account over 60 individual factors related to this aircraft entry.
Rating is out of a possible 100 points.
Relative Maximum Speed
Hi: 400mph
Lo: 200mph
This entry's maximum listed speed (339mph).

Graph average of 300 miles-per-hour.
City-to-City Ranges
Operational range when compared to distances between major cities (in KM).
Max Altitude Visualization
Small airplane graphic
Design Balance
The three qualities reflected above are altitude, speed, and range.
Aviation Era Span
Pie graph section
Showcasing era cross-over of this aircraft design.
Unit Production (2)
Compared against Ilyushin IL-2 (military) and Cessna 172 (civilian).

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Image of the Douglas XTB2D Skypirate
Image from the United States Navy image archives.

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