GB-1 | |
---|---|
Type | Glide bomb |
Place of origin | United States |
Service history | |
In service | 1943–1945 |
Used by | United States Army Air Forces |
Production history | |
Designed | 1941–1943 |
Manufacturer | Aeronca Aircraft |
Specifications | |
Wingspan | 12 feet (3.7 m) |
Warhead | 2,000 lb (910 kg) M34 GP bomb |
Operational range | 20 miles (32 km) |
Maximum speed | 230 miles per hour (370 km/h) |
Guidance system | Preset azimuth |
Launch platform | B-17 Flying Fortress |
The GB-1, also known as the "Grapefruit bomb" and as XM-108, [1] 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.
The U.S. Army Air Corps – which would later become the U.S. Army Air Forces – initiated development of a glide bomb design in March 1941. [2] Intended to allow bombers to stand off outside the range of enemy flak while releasing their bombload, while also potentially allowing for more precise targeting due to the shallow glide path the bomb would follow, the design resulted in three prototypes; one developed by Aeronca designated GB-1; a design by Bellanca designated GB-2, and the Timm Aircraft-designed GB-3. [3]
The GB-1 mated a 12-foot (3.7 m) wing and twin-tail empennage of conventional small-aircraft design to a standard M34 2,000-pound (910 kg) bomb. [2] A gyrostabilizer-based autopilot controlling azimuth was used, [2] allowing the bomb to be set to a specific course following release at a specific altitude and target distance; [1] gliding at a speed of 230 miles per hour (370 km/h), range from a release height of 15,000 feet (4,600 m) was 20 miles (32 km). [3]
Selected for production over the competing GB-2 and GB-3 due to its simpler control system and its proving more practical for bomber carriage, production of the GB-1 began in May 1943; [2] arriving in the combat zone in September, operational use was delayed due to the limited bombload the glider imposed – a B-17 Flying Fortress bomber could carry only two GB-1s on a mission, one on a rack under each of the bomber's wings – and the accuracy of the GB-1 proving to be significantly worse than that of ordinary bombs. Despite this, by May 1944 the first releases of GB-1s were undertaken. [3] On 28 May 1944, 42 of 113 glide bombs released hit Cologne, after being released 18 miles from the Eifeltor marshaling yard in the city at 195 miles per hour (314 km/h); many failed to hold an electrical charge in their batteries, causing their autopilots to fail. [4] German gunners mistook the bombs for aircraft they were shooting down, claiming over 90 kills. [1] Due to the inaccuracy the bombs demonstrated, the Eighth Air Force did not use the glide bombs again; [1] however other units would go on to use over a thousand GB-1s before the end of the war. [3]
During the war, variants of the GB-1 using a contrast seeker for anti-shipping use (GB-5, [5] GB-12), [6] heat seeking (GB-6), [5] semi-active radar homing (GB-7), [5] radio command guidance (GB-8), [5] television guidance (GB-10), [3] a flare seeker (GB-13), [6] and active radar homing (GB-14) [6] were developed, however none progressed beyond the testing stage. [3] A version for use in dispersing chemical agents, the GB-11, was also trialled but cancelled due to the end of the war; [6] the GT-1 torpedo-delivering glider was also derived from the GB-1. [7]
Production of the GB-1 was terminated in January 1945; [2] following the end of the war, the bomb was taken out of service. [3]
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 anti-aircraft 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 in most cases is to shoot down enemy aircraft before they approach within launching range, making glide bombs very potent weapons where wartime exigencies prevent this.
The Gorgon missile family was a series of experimental air-to-air, air-to-surface, and surface-to-surface missiles developed by the United States Navy's Naval Aircraft Modification Unit between 1943 and 1953. The immaturity of the technology involved meant that none of the Gorgon missiles achieved operational service, however they were extensively used in the development of guided missile controls and guidance technologies.
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.
The VB-6 Felix was a precision-guided munition developed by the United States during World War II. It used an infrared seeker to attack targets like blast furnaces or the metal roofs of large factories. The war ended before it could be used operationally.
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.
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.
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.
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.
The GT-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 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.
The ASM-N-5 Gorgon V was an unpowered air-to-surface missile, developed by the Glenn L. Martin Company during the early 1950s for use by the United States Navy as a chemical weapon delivery vehicle. Developed from the earlier PTV-N-2 Gorgon IV test vehicle, the program was cancelled without any Gorgon Vs seeing service.
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.
The PTV-N-2 Gorgon IV was a subsonic ramjet-powered missile developed by the Glenn L. Martin Company for the United States Navy. Originally intended as an air-to-surface weapon, it materialized as a propulsion test vehicle, and between 1947 and 1950 was used for test purposes and, as the KDM Plover, as a target drone.
The CTV-N-2 Gorgon IIC – also designated KGN, KUN, and CTV-2 – was an experimental drone, originally intended as a surface-to-surface missile, developed by the United States Navy near the end of World War II. It was used to test control and homing systems for guided missiles, and was also produced in small numbers as a target drone under the designations TD3N and KD2N.
The KA2N Gorgon IIA – also designated KU2N, CTV-4, and CTV-N-4 – was an air-to-air missile developed by the United States Navy near the end of World War II. Proving a failure in its designed role, it was repurposed as an experimental testbed for missile technology.
Jaguar was a three-stage sounding rocket developed by the United States Air Force in the early 1960s. Designed for air launch to allow soundings from remote areas without infrastructure, it was only launched twice before the project was abandoned.
Skokie was a family of research vehicles developed by the Cook Electric Co. for the United States Air Force during the mid to late 1950s. Launched from a B-29 bomber, Skokie 1 was an unpowered, ballistic vehicle, while Skokie 2 was rocket-propelled; both were used for evaluating and testing high-speed parachute recovery systems.
The Fairchild SD-5 Osprey was an early high-speed reconnaissance drone developed by Fairchild Aircraft for the United States Army. Intended for use by the U.S. Army Signal Corps to gather targeting information for tactical ballistic missiles, it was cancelled before the first prototype could be completed, and did not see operational service.
The TDU-12/B Skydart was an unguided target rocket built by Curtiss-Wright for use by the United States Air Force. It was used operationally from the late 1950s to the mid-1960s.
The AUM-N-6 Puffin, also known as Kingfisher F and AUM-6, was an anti-ship and anti-submarine missile developed for use by the United States Navy in the late 1940s. Pulsejet-powered and intended to allow an aircraft to launch a torpedo or bomb from stand-off range, it was flight-tested but failed to enter operational service.
{{cite book}}
: CS1 maint: numeric names: authors list (link)