GT-1 (missile)

Last updated
GT-1
GT-1 on B-25J.png
GT-1 glide torpedo mounted on North American B-25J Mitchell medium bomber
Type Air-to-surface missile
Place of originUnited States
Service history
In service1944-1945
Used by United States Army Air Forces
Production history
Designed1942-1943
Manufacturer Aeronca
Specifications
Wingspan12 feet (3.7 m)
Warhead Mk 13 Mod 2A aerial torpedo
Warhead weight600 pounds (270 kg) explosive

EngineNone
Operational
range
25 miles (40 km)
Maximum speed 260 miles per hour (420 km/h)
Guidance
system
Preset plus paravane
Launch
platform
B-25 Mitchell

The GT-1 (Glide Torpedo 1) was an early form of stand-off weaponry developed by the United States Army Air Forces during World War II. Intended to deliver an aerial torpedo at a safe range from the launching aircraft, the weapon proved successful enough in testing to be approved for operational use, and the GT-1 saw limited use in the closing stages of the war.

Contents

Design and development

The GT-1 was derived from the GB-1 series of glide bombs, developed by Aeronca for the United States Army Air Forces. [1] The weapon's airframe was inexpensive and simply designed, with a basic wing and twin tails attached to a cradle for carrying the payload. [1] The flight path of the GT-1 was determined by a preset autopilot that kept the weapon on a steady course after release. [1]

The GT-1 was usually released from its carrier aircraft at an altitude of 10,000 feet (3,000 m); this provided a standoff range of as much as 25 miles (40 km) under ideal conditions. [2] [3] The GT-1's warload consisted of a Mark 13 Mod 2A aerial torpedo. The GT-1 was fitted with a paravane, trailing 20 feet (6.1 m) below the main body of the craft; upon the paravane's striking the surface of the water, explosive bolts would fire to release the torpedo, which would then execute a preset search pattern to locate and destroy its target. [1] [2]

Operational history

Initially tested during 1943, [1] [4] the GT-1 proved to be successful, [5] and was issued to a single operational unit for service. [6] Launched from North American B-25 Mitchell bombers, [1] [7] the GT-1 saw brief operational service late in the war; [1] [4] three missions are known to have been flown using the weapon from Okinawa in late 1945. [7] On one mission, against Kagoshima, eleven of thirteen GT-1s launched successfully entered the water; three hits were recorded, against a fleet carrier, a light carrier, and a freighter. [7] The Boeing B-17 Flying Fortress was also capable of carrying the GT-1. [3]

Following the end of World War II, the aerial torpedo rapidly fell out of favor as a weapon of war against surface ships[ citation needed ], and the 'GT' category of weapons was abolished in 1947. [8]

See also

Related Research Articles

<span class="mw-page-title-main">Glide bomb</span> Aerial weapon with flight control surfaces

A glide bomb or stand-off bomb is a standoff weapon with flight control surfaces to give it a flatter, gliding flight path than that of a conventional bomb without such surfaces. This allows it to be released at a distance from the target rather than right over it, allowing a successful attack without exposing the launching aircraft to air defenses near the target. Glide bombs can accurately deliver warheads in a manner comparable to cruise missiles at a fraction of the cost—sometimes by installing flight control kits on simple unguided bombs—and they are very difficult for surface-to-air missiles to intercept due to their tiny radar signatures and short flight times. The only effective countermeasure is to intercept launching aircraft before they approach within range, making glide bombs very potent weapons where wartime exigencies prevent this.

<span class="mw-page-title-main">Blohm & Voss BV 246</span> Aerial bomb

The Blohm & Voss BV 246 Hagelkorn was a guided glide bomb developed to bomb specific targets once it was released.

<span class="mw-page-title-main">Aerial torpedo</span> Naval torpedo launched by aircraft

An aerial torpedo is a torpedo launched from a torpedo bomber aircraft into the water, after which the weapon propels itself to the target.

<span class="mw-page-title-main">Project Kingfisher</span> Anti-ship missiles

Project Kingfisher was a weapons-development program initiated by the United States Navy during the latter part of World War II. Intended to provide aircraft and surface ships with the ability to deliver torpedoes to targets from outside the range of defensive armament, six different missile concepts were developed; four were selected for full development programs, but only one reached operational service.

<span class="mw-page-title-main">LBD Gargoyle</span> Anti-ship missile / guided bomb

The LBD-1 Gargoyle was an American air-to-surface missile developed during World War II by McDonnell Aircraft for the United States Navy. One of the precursors of modern anti-ship missiles, it was extensively used as a test vehicle during the late 1940s.

<span class="mw-page-title-main">Attacks on Kure and the Inland Sea (July 1945)</span> Naval battle of World War II

The attacks on Kure and the Inland Sea by United States and British naval aircraft in late July 1945 sank most of the surviving large warships of the Imperial Japanese Navy (IJN). The United States Third Fleet's attacks on Kure Naval Arsenal and nearby ports on 24, 25, and 28 July sank an aircraft carrier, three battleships, five cruisers, and several smaller warships. During the same period the British Pacific Fleet attacked other targets in the Inland Sea region and sank two escort ships and several smaller vessels as well as damaging an escort carrier.

<span class="mw-page-title-main">Fairchild BQ-3</span> Type of aircraft

The Fairchild BQ-3, also known as the Model 79, was an early expendable unmanned aerial vehicle – referred to at the time as an "assault drone" – developed by Fairchild Aircraft from the company's AT-21 Gunner advanced trainer during the Second World War for use by the United States Army Air Forces. Two examples of the type were built and flight-tested, but the progress of guided missiles rendered the assault drone quickly obsolete, and the type was not produced.

<span class="mw-page-title-main">Interstate TDR</span> UCAV created in 1944, used by the US Navy

The Interstate TDR was an early unmanned combat aerial vehicle — referred to at the time as an "assault drone" — developed by the Interstate Aircraft and Engineering Corporation during the Second World War for use by the United States Navy. Capable of being armed with bombs or torpedoes, 2000 aircraft were ordered, but only around 200 were built. The type saw some service in the Pacific Theater against the Japanese, but continuing developmental issues affecting the aircraft, along with the success of operations using more conventional weapons, led to the decision being made to cancel the assault drone program in October 1944.

<span class="mw-page-title-main">Naval Aircraft Factory TDN</span> Type of aircraft

The Naval Aircraft Factory TDN was an early unmanned combat aerial vehicle - referred to at the time as an "assault drone" - developed by the United States Navy's Naval Aircraft Factory during the Second World War. Developed and tested during 1942 and 1943, the design proved moderately successful, but development of improved drones saw the TDN-1 relegated to second-line duties, and none were used in operational service.

<span class="mw-page-title-main">BOAR</span> Air-to-surface missile

The Bombardment Aircraft Rocket, also known as BOAR, the Bureau of Ordnance Aircraft Rocket, and officially as the 30.5-Inch Rocket, Mark 1, Mod 0, was an unguided air-to-surface rocket developed by the United States Navy's Naval Ordnance Test Station during the 1950s. Intended to provide a standoff nuclear capability for carrier-based aircraft, the rocket entered operational service in 1956, remaining in service until 1963.

<span class="mw-page-title-main">2.25-Inch Sub-Caliber Aircraft Rocket</span> Training rocket

The 2.25-Inch Sub-Caliber Aircraft Rocket, or SCAR, was an American unguided rocket developed by the United States Navy during World War II and used for sub-caliber rocket training. Capable of simulating the aerial rockets then coming into operational service, the SCAR was used to train pilots in the use of the new type of weapon, and continued in service throughout the 1950s.

<span class="mw-page-title-main">Pratt-Read LBE</span> Type of aircraft

The Pratt-Read LBE-1 was a prototype glide bomb, or "Glomb", developed for the United States Navy during World War II. Although there were high hopes for the concept, the limitations of the Glomb led to the production contract for the LBE-1 being reduced, then cancelled, and only four examples of the type were ever built.

<span class="mw-page-title-main">Piper LBP</span> Type of aircraft

The Piper LBP was a glide bomb, or "Glomb", developed by Piper Aircraft for the United States Navy during World War II. Developed as one of three "Glomb" aircraft, the inherent limitations of the Glomb and the technology of the time, combined with difficulties encountered in testing of the prototype, led to the production contract for the LBP-1 being reduced, then cancelled, with none of the Glomb aircraft ever seeing operational service.

<span class="mw-page-title-main">Glomb</span> Glide bomb

Glomb, from "glide bomb", was a project undertaken by the United States Navy during World War II to develop an unmanned aircraft for delivering bombs to high-value, well-protected targets without risk to aircrew. The project proceeded through the war, producing several prototype aircraft, but technical limitations meant no Glombs saw operational service and the program was cancelled at the end of the war.

<span class="mw-page-title-main">Taylorcraft LBT</span> Type of aircraft

The Taylorcraft LBT was a glider designed and built by Taylorcraft during World War II, in response to a United States Navy requirement for a glide bomb. One of three prototype "Glomb" models ordered by the Navy, the LBT suffered from technical and performance difficulties, and was cancelled early in production, none of the aircraft seeing operational service.

<span class="mw-page-title-main">ASM-A-1 Tarzon</span> Guided bomb

The ASM-A-1 Tarzon, also known as VB-13, was a guided bomb developed by the United States Army Air Forces during the late 1940s. Mating the guidance system of the earlier Razon radio-controlled weapon with a British Tallboy 12,000-pound (5,400 kg) bomb, the ASM-A-1 saw brief operational service in the Korean War before being withdrawn from service in 1951.

<span class="mw-page-title-main">JB-4</span> American air-to-surface missile prototype

The JB-4, also known as MX-607, was an early American air-to-surface missile developed by the United States Army Air Forces during World War II. Using television/radio-command guidance, the JB-4 reached the flight-testing stage before being cancelled at the end of the war.

<span class="mw-page-title-main">AAM-N-5 Meteor</span> Air-to-air missile

The AAM-N-5 Meteor was an early American air-to-air missile, developed by the Massachusetts Institute of Technology and Bell Aircraft for the United States Navy. Initially, both air-launched and ship-launched versions were considered. Versions designed for launch from carrier-based aircraft proceeded to the flight testing stage before the project was cancelled.

Television guidance (TGM) is a type of missile guidance system using a television camera in the missile or glide bomb that sends its signal back to the launch platform. There, a weapons officer or bomb aimer watches the image on a television screen and sends corrections to the missile, typically over a radio control link. Television guidance is not a seeker because it is not automated, although semi-automated systems with autopilots to smooth out the motion are known. They should not be confused with contrast seekers, which also use a television camera but are true automated seeker systems.

<span class="mw-page-title-main">GB-1</span> U.S. World War II glide bomb

The GB-1, also known as the "Grapefruit bomb" and as XM-108, was a glide bomb produced by Aeronca Aircraft for the United States Army Air Forces during World War II. Intended to allow bombers to release bombs from outside the range of enemy defenses, over one thousand GB-1s were used in combat before the end of the war.

References

External videos
Nuvola apps kaboodle.svg Preset Glide Torpedo Model GT-1

Notes

  1. 1 2 3 4 5 6 7 Parsch 2003
  2. 1 2 Esquire 1947; Volume 28, p.70.
  3. 1 2 Army Ordnance, Volume 30, 1946. American Defense Preparedness Association. p.384.
  4. 1 2 Cate and Craven 1958, p.259.
  5. Daso 1997, p.82.
  6. Goebel 2010
  7. 1 2 3 Hanle 2011
  8. Mann 2008, p.256.

Bibliography

  • Craven, Wesley F.; James L. Cate (1958). USAF Historical Division (ed.). Men and Planes. The Army Air Forces in World War II. Vol. 6. Chicago: University of Chicago Press. ASIN   B000ZIBK5G.
  • Daso, Dik A. (1997). Architects of American Air Supremacy: General Hap Arnold and Dr. Theodore von Kármán. Maxwell Air Force Base, AL: Air University Press. ISBN   9781585660421 . Retrieved 2011-02-02.
  • Goebel, Greg (2010). "World War II Glide Bombs". Dumb Bombs & Smart Munitions. VectorSite. Retrieved 2017-05-14.
  • Hanle, Donald J. (January 2011). "Hail November". Air Force Magazine. 94 (1). Retrieved 2011-02-02.
  • Mann, Robert A. (2008). Aircraft record cards of the United States Air Force: How to Read the Codes. Jefferson, NC: McFarland & Company. ISBN   978-0-7864-3782-5 . Retrieved 2011-02-02.
  • Parsch, Andreas (2003). "GB Series". Directory of U.S. Military Rockets and Missiles Appendix 1: Early Missiles and Drones. designation-systems.net. Retrieved 2011-02-02.