GT-1 (missile)

GT-1
GT-1 glide torpedo mounted on North American B-25J Mitchell medium bomber
Type	Air-to-surface missile
Place of origin	United States
Service history
In service	1944-1945
Used by	United States Army Air Forces
Production history
Designed	1942-1943
Manufacturer	Aeronca
Specifications
Wingspan	12 feet (3.7 m)
Warhead	Mk 13 Mod 2A aerial torpedo
Warhead weight	600 pounds (270 kg) explosive
Engine	None
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.

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]

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]

• Project Kingfisher

External videos
Preset Glide Torpedo Model GT-1

• Media related to GT-1 at Wikimedia Commons