ASM-N-2 Bat

Last updated

ASM-N-2 Bat
BAT-PB4Y-wingbat.jpg
Bat guided bomb mated to PB4Y Privateer
Type Conventional
Place of originUnited States
Service history
In service1945 (Bomb MK 57) [1] – 1953 (ASM-N-2)
Used by United States Navy
Wars World War II
Production history
Manufacturer National Bureau of Standards
No. built2580 [2]
Specifications
MassAirframe and guidance package only – 600 pounds (270 kg)
Length11 feet 11 inches (3.63 m)
Width10 feet (3.0 m)

Filling weight1,000 lb bomb (1,600 lb (727 kg) gross)
A Bat on its hoist Bat missile NAN6-50.jpg
A Bat on its hoist

The ASM-N-2 Bat was a United States Navy World War II radar-guided glide bomb [3] [4] which was used in combat beginning in April 1944. It was developed and overseen by a unit within the National Bureau of Standards (which unit later became a part of the Army Research Laboratory) with assistance from the Navy's Bureau of Ordnance, the Massachusetts Institute of Technology, and Bell Telephone Laboratories. [5] It is considered to be the first fully automated guided missile used in combat. [6]

Contents

Background

In January 1941 RCA proposed a new TV-guided anti-shipping weapon, called Dragon, for which an operator would use the TV image sent from the nose of the weapon and operate aerodynamic controls during the weapon's fall. The National Bureau of Standards (NBS) would provide the airframe for use with a standard bomb, and was the same guidable ordnance airframe design used for the earlier, abortive Project Pigeon weapons program. The Pelican was a June 1942 modification using semi-active radar homing. By mid-1943, a modification of the design was proposed to use a new active radar homing system from Western Electric with a 2,000-pound (907 kg) (one short ton) general-purpose (GP) bomb, the same basic "AN-M66" ordnance unit as used for the heavier USAAF VB-2 version of the Azon radio-controlled ordnance. This Pelican version entered testing in summer 1944 at Naval Air Station New York, where it hit its target ship in two out of four drops.

Development

The Bat was the production version which combined the original NBS airframe with a 1,000-pound (454 kg) AN-M65 GP bomb, the same basic ordnance that was used in the contemporary Azon guided munition, and the Pelican active radar system. [7] Gyrostabilized with an autopilot supplied by Bendix Aviation, the steerable tail elevator was powered by small wind-driven generators. The Navy's Bureau of Ordnance [7] in partnership with the Massachusetts Institute of Technology (MIT) supervised development and the NBS was in charge of the overall development. Flight tests were conducted at the Naval Air Ordnance Test Station at Chincoteague Island, Virginia. Hugh Latimer Dryden won the President's Certificate of Merit for the development of the Bat, [3] which "was flight tested by a small unit based at Philadelphia against targets in New Jersey." [8] While the NBS developed the Bat's aerodynamic and gyroscopic stabilizing systems, MIT and Bell Labs worked together on its guidance mechanism. [6]

Deployment

A Bat weapon on a bomb cart, with its nose radome removed Bat radar NAN6-50.jpg
A Bat weapon on a bomb cart, with its nose radome removed

The antiship variant of the Bat (SWOD, for "Special Weapons Ordnance Device", [9] Mark 9 Modification 0) eventually saw combat service beginning in April 1945 off Borneo, dropped by Consolidated PB4Y Privateers [7] (one bomb mounted under each wing) at altitudes of 15,000 to 25,000 feet (4,600 to 7,600 metres) at airspeeds of 140 to 210 kn (260 to 390 km/h). Several Japanese ships were sunk and the kaibokan Aguni was damaged from a range of 20 nmi (37 km), which is frequently miscredited as being sunk by a destroyer. [10] Several Bats were also fitted with modified radar systems (SWOD Mark 9 Model 1) and dropped on Japanese-held bridges in Burma – the same targets that the MCLOS-guidance, half-ton (AN-M65 GP bomb) weight VB-1 Azon PGM ordnance was designed to take on – and other land-based targets. The Bat's pioneering radar guidance system was easily confused by radar land clutter, particularly against targets close to shore. About a total of 2,600 Bat missiles were deployed. [6]

After the war, the naval designation ASM-N-2 was applied to the unit.

The Privateer was the primary launch platform for the Bat, but other aircraft were also modified to launch the weapon, including the Vought F4U Corsair, Curtiss SB2C Helldiver, and Grumman TBF Avenger. The primary post-World War II aircraft to carry the weapon was the P2V Neptune.

Existing missiles

The original NBS test airframe of the Bat was renovated in 2001 to resemble the real missile and is currently on display at the museum of the National Institute of Standards and Technology, [11] the successor to the earlier US National Bureau of Standards. Another example is on display at the Pima Air & Space Museum in Tucson, Arizona. [12]

See also

Related lists

Related Research Articles

<span class="mw-page-title-main">Anti-ship missile</span> Missile used to attack ships

An anti-ship missile (AShM) is a guided missile that is designed for use against ships and large boats. Most anti-ship missiles are of the sea skimming variety, and many use a combination of inertial guidance and active radar homing. A large number of other anti-ship missiles use infrared homing to follow the heat that is emitted by a ship; it is also possible for anti-ship missiles to be guided by radio command all the way.

<span class="mw-page-title-main">Proximity fuze</span> Automatic fuze that detonates an explosive device based on predetermined distance

A proximity fuze is a fuze that detonates an explosive device automatically when it approaches within a certain distance of its target. Proximity fuzes are designed for elusive military targets such as airplanes and missiles, as well as ships at sea and ground forces. This sophisticated trigger mechanism may increase lethality by 5 to 10 times compared to the common contact fuze or timed fuze.

<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">Fritz X</span> WWII radio guided bomb developed by Nazi Germany

Fritz X was the most common name for a German guided anti-ship glide bomb used during World War II. Fritz X was the world's first precision guided weapon deployed in combat and the first to sink a ship in combat. Fritz X was a nickname used both by Allied and Luftwaffe personnel. Alternative names include Ruhrstahl SD 1400 X, Kramer X-1, PC 1400X or FX 1400.

<span class="mw-page-title-main">Pacific Missile Test Center</span>

Pacific Missile Test Center (PMTC) is the former name of the current Naval Air Warfare Center, Weapons Division. The name of the center was the Naval Air Missile Test Center prior to PMTC. It is located at Naval Base Ventura County/Naval Air Station Point Mugu in Ventura County, California. The nearest city to the installation is Oxnard.

<span class="mw-page-title-main">Azon</span> American guided bomb

AZON, from "azimuth only", was one of the world's first guided weapons, deployed by the Allies and contemporary with the German Fritz X.

<span class="mw-page-title-main">Guided bomb</span> Bomb controllable from an external device

A guided bomb is a precision-guided munition designed to achieve a smaller circular error probable (CEP).

<span class="mw-page-title-main">Project Gorgon</span> Ground-to-ground missile

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.

<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">VB-6 Felix</span> American infrared homing guided bomb

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.

<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">SAM-N-2 Lark</span> Surface-to-air missile

The SAM-N-2 Lark project was a solid-fuel boosted, liquid-fueled surface-to-air missile developed by the United States Navy to meet the kamikaze threat. It was developed as a crash program to introduce a medium-range defensive layer that would attack targets between the long-range combat air patrols and short-range anti-aircraft artillery. This produced a design with roughly 30 miles (48 km) maximum range and subsonic performance, suitable for attacks against Japanese aircraft.

<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">VB-3 Razon</span> Guided bomb

The VB-3 Razon was a high-angle freefall guided bomb developed by the United States Army Air Force during the 1940s. Razon was a standard AN-M65 1,000-pound general-purpose bomb, the same basic ordnance unit used for its AZimuth-ONly guided predecessor, the VB-1 Azon guided ordnance, with the Razon concept fitted with flight control surfaces that also enabled adjustment in the vertical plane, like the Luftwaffe's heavier Fritz X armored anti-ship guided ordnance. Development of the Razon began in 1942, but it did not see use during World War II although it was combat ready in the summer of 1945. The VB-4 used a 2,000-pound bomb.

<span class="mw-page-title-main">PTV-N-2 Gorgon IV</span> Propulsion test vehicle

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.

<span class="mw-page-title-main">CTV-N-2 Gorgon IIC</span> Propulsion test vehicle

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.

<span class="mw-page-title-main">Pelican (bomb)</span> Guided bomb

The Pelican, also known as Bomb Mark 55 and, in one version, SWOD Mark 7, was a guided bomb developed by the United States Navy during World War II. Guided by semi-active radar homing, Pelican was produced in 1,000 lb (450 kg) and 1,500 lb (680 kg) sizes; the program reached the stage of live trials before being cancelled.

<span class="mw-page-title-main">ASM-N-6 Omar</span> Air-to-surface missile

The ASM-N-6 Omar was a short-range air-to-surface missile developed for and evaluated by the United States Navy in the early 1950s. Intended to use existing unguided rockets as a basis and using a novel guidance system involving optical beam-riding, the program was unable to resolve difficulties with the guidance system and was cancelled without entering service.

<span class="mw-page-title-main">AUM-N-6 Puffin</span> Anti-ship missile

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.

References

  1. "ASM-N-2". Directory of U.S. Military Rockets and Missiles. Archived from the original on 13 November 2007. Retrieved 24 December 2007.
  2. Kopp, Dr Carlo. "The Dawn of the Smart Bomb". Air Power Australia. Retrieved 24 December 2007.
  3. 1 2 "Missile, Air-to-Surface, Bat". Rockets and Missiles. Smithsonian National Air and Space Museum. Archived from the original on 7 May 2009. Retrieved 12 May 2009.
  4. Newman, Michael E. "Students Help Renovate a Part of WWII-and NIST-History". NIST Tech Beat – February 2001 – Preservation. National Institute of Standards and Technology. Archived from the original on 2 April 2015. Retrieved 19 March 2015.
  5. Sweeney, Jim (January 2002). "Restoration: The Bat". Air & Space Magazine. Retrieved 13 July 2018.
  6. 1 2 3 Materese, Robin (20 June 2017). "Giving New Wings to an Old Bat". NIST. Retrieved 13 July 2018.
  7. 1 2 3 Fahrney, Delmar S., RADM USN (December 1980). "The Birth of Guided Missiles". United States Naval Institute Proceedings. p. 60.{{cite web}}: CS1 maint: multiple names: authors list (link)
  8. Merrill, Capt Grayson (n.d.). "Innovation Wins Wars". Your story – Class of 1934. USNA Alumni Association and Foundation. Retrieved 7 January 2013. BAT was flight tested by a small unit based at Philadelphia against targets in New Jersey.
  9. SWOD
  10. "Japanese Escorts".
  11. "The Bat Missile". NIST. Archived from the original on 27 May 2010. Retrieved 7 June 2010.
  12. "Designation: ASM-N-2". Pima Air & Space Museum. Retrieved 6 July 2023.