Munitions / Torpedoes / UMGT-1

UMGT-1

General Facts

  • TYPE
    Lightweight torpedo

  • ORIGIN
    USSR

  • NICKNAMES
    AT-3 Orlan (air launched variant)
    E40-75A (NATO designation)
    E40-79 (NATO designation)

  • DESIGNED
    1970's

  • DESIGNER
    NGO Uran (now Gidropribor)

  • PRODUCTION
    1981 - present

  • PRODUCERS
    Russia - Gidropribor
    USSR - Gidropribor

  • QUANTITY
    Unknown

  • UNIT COST
    Unknown

  • CHARACTERISTICS
    Good seeker range
    Good speed and maneuverability
    Limited range
    Cannot be used in fresh water

Introduction

The UMGT-1 is a lightweight torpedo of Soviet origin. It was developed as a more capable alternative to the AT-1 torpedo for use on the URK-5 Rastrub rocket ASW system. Aside from being delivered as payload on various types of ASW rockets the UMGT-1 can also be launched from helicopters and fixed wing aircraft. In that role it is designated AT-3.

Layout

The UMGT-1 has a conventional layout with the homing section and warhead in the nose, the battery in the middle and the engine and control fins at the rear. Being battery powered the UMGT-1 has a limited effective range. This should not be a problem because the ASW rocket or aircraft should drop the UMGT-1 near its intended target. A drawback of the battery is that it is seawater activated. As such the UMGT-1 cannot be used in fresh water.

Guidance

The UMGT-1 uses a passive and active sonar guidance system with an effective range of 1.5 km. The orignal UMGT-1 can only be used against submarines. The improved UMGT-1M can also target surface vessels.

Firepower

The UMGT-1 has a range of 8 km and a speed of 41 kt. Targets up to 450 meters below sea level can be engaged. The 60 kg warhead is more powerful than those used on many other lightweight torpedoes.

Launch platforms

The UMGT-1 carried as payload underneath the URK-5 Rastrub ASW rocket. Alternatively it is carried in the nose of the 533mm RPK-6 Vodopad or 650mm RPK-7 Veder ASW rocket torpedoes. The AT-3 version is air lauched by helicopters or Il-38 May ASW aircraft.

Users

The UMGT-1 was widely used by the Soviet navy on aircraft and the ASW rocket systems on destroyers, cruisers and submarines. It remains in use with the Russian navy. Foreign use is believed to be limited.

Variants

UMGT-1

The UMGT-1 is an air launched lightweight torpedo that is carried as payload by ASW rocket systems. The aircraft launched version is designatied AT-3. The UMGT-1 can be identified by the four fins at the rear that extend beyond the diameter of the body and the pumpjet propulsion.

UMGT-1: Original version introduced in 1981 as payload for rocked based ASW systems.
UMGT-1M: Improved version of UMGT-1 that was introduced in 1991. It has a more powerful warhead, cheaper battery and the ability to engage surface vessels.
UMGT-1ME: Export version of UMGT-1M.

TypeAnti-submarine torpedo
PlatformAircraft, rocket payload
Diameter400 mm body, 501mm fins
Length3.485 m
Weight720 kg with parachute
Warhead60 kg explosive charge, 3.5 m fuse distance
GuidanceActive/passive acoustic seeker, 1.5 km range
PropulsionPump jet impeller
Power supplySilver magnesium seawater battery
Speed41 kt
Range8 km at 41 kt
DepthUp to 450 m
TypeMultipurpose torpedo
PlatformAircraft, rocket payload
Diameter400 mm body, 0.5 m fins
Length3.485 m
Weight725 kg with parachute
Warhead60 kg explosive charge, equivalent to 100 kg TNT
GuidanceActive/passive acoustic seeker, 1.5 km range
PropulsionPump jet impeller
Power supplyCopper magnesium seawater battery
Speed41 kt
Range7.5 to 8 km at 41 kt
DepthUp to 550 m

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