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AT-1



Introduction


AT-1 torpedo

Soviet 450 mm AT-1 torpedo on public display in the Vladivostok fortress museum.
Source: www.vlad-fort.ru - © Copyright lies with original owner

Origin
Soviet Union
Type
Lightweight torpedo
Entered service
1963
Status
Obsolete
Development
1959 - 1963
Developer
Soviet Union - NII-400 (Gidropribor)
Production
1963 - 1970
Producer
Soviet Union - Dagdizel plant
Number produced
925, incl AT-1M and MV
Designations
Izdeliye 242 (article index)
Notable users
Soviet Union

Description


Introduction

The AT-1 is an early Cold War era lightweight torpedo of Soviet origin. It is an air-launched torpedo with active-passive acoustic homing warhead for anti-submarine warfare. It supplements older types of Soviet 450mm torpedoes that are less suitable for use against submarines.

Design

The AT-1 torpedo is an air-launched derivative of the SET-40 / MGT-2 lightweight anti-submarine torpedo that was developed for use by submarines. The AT-1 uses the same acoustic homing system, batteries and electric motor. The body is wider at 450 to fit existing torpedo racks in aircraft bomb bays.

Guidance

The AT-1 has a two plane active-passive acoustic homing system. Effective range is about 400 to 800 meters.

Firepower

At 80 kg the warhead is modest in size, but should be adequate in close proximity. The warhead is set off by a sonar proximity fuse. At 29 knots the speed is rather good. The silver-zinc batteries only provide power for a range of 5 km. Maximum depth is 200 meters.

Platforms

The AT-1 torpedo was developed for use with the new Il-38 (NATO: May) maritime patrol aircraft. It entered service with the Be-12 amphibious aircraft before the Il-38 became operational. The larger Tu-142 could also carry the AT-1. The AT-1MV helicopter model could be launched by the Mi-4T, Ka-25BSh, Ka-27PL and Mi-14PL naval helicopters.

Users

The AT-1 was adopted in quantity with Soviet forces. Apparently some of these remained in 1997 and possibly longer in Russia. AT-1 was available for export as the AT-1E.

Variants


AT-1MV

Soviet 450mm AT-1MV helicopter launched anti-submarine warfare torpedo seen in the weapons bay of a Ka-27PL helicopter.
Source: Oleg Podkladov - © Copyright lies with original owner

List of AT-1 torpedo variants

AT-1
Original production model, introduced in 1963.
AT-1M
Updated model with improved electrical systems, introduced in 1966.
AT-1MV
Variant of the AT-1M with different parachute set-up for helicopter launch. Also introduced in 1966.
VTT-1
Helicopter launched variant with remote-control from the helicopter. Introduced in 1967.

Details


Facts AT-1
General
Origin
Soviet Union
Type
Lightweight torpedo
Launch platform
Aircraft
Target platform
Submarines
Dimensions
Diameter
450 mm
Length
4.03 m
Weight
580 kg
Warhead
Weight
70 kg
Fuse
I-175G sonar proximity fuse, 5 to 6 m radius
Back-up impact fuse
Guidance
Homing
Active-passive acoustic homing
400 to 800 m range in active mode
Wire guidance
No
Propulsion
Engine type
38 kW DP-11M electric motor
Power source
MZ-2 silver-zinc single use batteries
TS-4 rechargeable batteries for training torpedo
Propulsion
Single propeller
Performance
Speed
29 knots
Range
5 km
Depth
20 to 200 m
Launch parameters
Speed
<600 km/h
Altitude
400 m to 2 km for AT-1 and AT-1M
20 m to 500 m for AT-1MV helicopter launched version

Platforms


note: incomplete list

Ilyushin Il-38

The AT-1 was developed for use with the new Il-38, but entered service earlier with other types of aircraft.

Kamov Ka-25BSh

The Ka-25BSh anti-submarine warfare helicopter can carry and launch the AT-1MV variant of the AT-1 torpedo.

Kamov Ka-27PL

The Ka-27PL anti-submarine warfare helicopter can carry and launch the AT-1MV variant of the AT-1 torpedo.

Media


Related articles


SET-40

The AT-1 air-launched torpedo incorporated many of the technologies of the SET-40, which was developed by the same research institute at the same time.

AT-2

The AT-1 was supplemented by the larger diameter AT-2 air launched anti-submarine warfare torpedo. The AT-2 is faster, has a longer range and was at a later stage fitted with more capable homing systems.