Volcano mine system

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M977 HEMTT with M136 Volcano mine dispensing system M977 HEMTT with M136 Volcano mine dispensing system.jpg
M977 HEMTT with M136 Volcano mine dispensing system
UH-60 Blackhawk with M136 Volcano mine dispensing system UH-60 Blackhawk with Volcano mine system.jpg
UH-60 Blackhawk with M136 Volcano mine dispensing system

The M136 Volcano Vehicle-Launched Scatterable Mine System is an automated mine delivery system developed by the United States Army in the 1980s. The system uses prepackaged mine canisters which contain multiple anti-personnel (AP) and/or anti-tank (AT) mines which are dispersed over a wide area when ejected from the canister. The system, commonly referred to as Volcano, is also used by other armies around the world. [1]

Contents

Overview

Volcano mine system components Volcano mine system components.jpg
Volcano mine system components

The primary purpose of Volcano is to provide the employing force with the capability to emplace large minefields rapidly under varied conditions. Volcano minefields are ideal for providing flank protection of advancing forces and for operating in concert with air and ground units on flank guard or screen missions. [1]

The system consists of the M139 dispenser used for dispensing pre-packaged mine canisters, the dispensing control unit (DCU) and mounting hardware, and is designed to be mounted on either ground or aerial vehicles using the same components except for the mounting hardware, which varies between fitment. Volcano is designed to be fitted to and removed from vehicles with a minimum of time and labour. The dispensing system is also designed for ease of use, to be operated by personnel with a minimum of training. The ordnance used by the system is based upon a modified GATOR mine. Both live and inert (training) ordnance is available; live canisters are painted green while inert canisters are painted blue. [1] [2]

When fitted to aircraft, the system is referred to as Air Volcano and when fitted to ground vehicles is referred to as Ground Volcano. The principles and procedures of Volcano minefield emplacement are significantly different for air- and ground-delivery systems; the differences can be summarised as follows: [1] [3]

Air Volcano

Air Volcano is the fastest method for emplacing large tactical minefields. Although mine placement is not as precise as it is with ground systems, Air Volcano minefields can be placed accurately enough to avoid the danger inherent in minefields delivered by artillery or jet aircraft. Air Volcano is the best form of an obstacle reserve because a minefield can be emplaced in minutes.

Air Volcano minefield should not be planned or dispensed in areas under enemy observation and fire as the dispensing helicopter is extremely vulnerable to anti-aircraft fire while flying at a steady altitude, speed and flight path required to successfully emplace the minefield. Close coordination between aviation and ground units is required to ensure that Volcano-dispensed mines are emplaced accurately and quickly.

Ground Volcano

Ground Volcano is designed to emplace large minefields in depth and tactical minefields oriented on enemy forces in support of manoeuvre operations and friendly AT fire. It is ideal for use as an obstacle reserve, employed when enemy forces reach a decision point that indicates future movement. Obstacles can then be emplaced in depth on the avenues the enemy is using, leaving other avenues open for friendly movement.

Ground Volcano is normally employed by combat engineer units. Emplaced minefields are vulnerable to direct and indirect fire, and must be protected when close to the forward line of own troops (FLOT).

Design

Ordnance

M87 mine canister M87 mine canister.jpg
M87 mine canister
M89 training canister M89 Volcano training canister.jpg
M89 training canister
M87 canister breech assembly M87 mine canister breech assembly.jpg
M87 canister breech assembly
M88 training mine M88 Volcano training mine.jpg
M88 training mine

The Volcano system uses the following live ordnance: [3] [4]

The canister is an aluminium tube 24.09 inches (61 centimetres) in length and 5 inches (13 centimetres) in diameter and weighs 30.2 pounds (13.7 kilograms). There is a breech assembly at one end attached to which are six transmitter coils, one for each mine, which physically and electronically connects to the dispenser. Canisters (live) are painted green (FS34079) with a band of yellow and black triangles near the breech end. The mines in each canister are electrically connected by a nylon web that also functions as a lateral dispersion device as the mines exit the canister. Spring fingers mounted on each mine prevent the mine from coming to rest on edge. Upon coming to rest, each mine has a delayed arming time of 2 minutes and 15 seconds. [lower-alpha 1] Each mine canister has a variable self destruct with three settings of 4 hours, 48 hours or 15 days, preset prior to dispensing. [4]

The Volcano system also allows the use of the following inert ordnance: [3] [4]

  1. simulates a functional canister
  2. simulates an error code 4, shorted electric primer
  3. simulates an error code 8, rack electronics failure
  4. simulates an error code 9, open electric primer.

Dispenser and Control Unit

M139 Volcano mine dispenser fitted with M88 practice mine canister M139 Volcano mine dispenser fitted with M88 practice mine canister.jpg
M139 Volcano mine dispenser fitted with M88 practice mine canister

Mounting Hardware

The mounting hardware secures the racks to the dispensing vehicle or aircraft, and are specific to each type of dispensing vehicle or aircraft. For aircraft, the racks are equipped with a jettison assembly to release and propel the racks away from the aircraft in case of an emergency. [1] [4] Available mounting racks, listed by vehicle and NATO stock number (NSN), includes: [1] [7]

Operation

US soldier reloading Volcano mine system US soldier reloading Volcano mine system.jpg
US soldier reloading Volcano mine system

Handling

Volcano munitions are transported and handled in accordance with regulations for Class V mines and explosives. [2] [5]

Training and Personnel

Volcano operation requires no special skills as the system is designed for ease of use such that only a designated rather than a dedicated operator is required. Initial operator training will be for familiarisation only with a semi-annual refresher course expected to be sufficient to maintain proficiency. In training operations, the M87 mine canister is replaced with the M88 Practice Mine Canister or M89 Training Canister. [1] [4]

Types of Minefields

The Volcano system is suitable for emplacing four different types of minefields, each of which has a specific purpose: [1]

  1. Disrupt: Causes confusion in enemy formations. For this minefield, the lethality and density is low.
  2. Fix: Allows massed ground fire upon the enemy. Placement is critical; the commander must plan this type of minefield carefully and the location must be synchronised to allow the ground forces to mass their fires on the enemy once the enemy has been fixed by the obstacle i.e. encounters the minefield.
  3. Turn: Influences the manoeuvre of enemy formations. For this minefield, density and lethality are critical. Individual minefields may be stacked so as to influence the enemy movement.
  4. Block: Deny the enemy use of terrain. This minefield requires high density and lethality, as well as reinforcement from other obstacles (natural and man-made), to help stop the enemy's use of the terrain.

Both Air and Ground Volcano are capable of emplacing non-standard minefields i.e. one whose purpose (and therefore layout) does not adhere to the four types described above. [4]

Mine Emplacement

Volcano disrupt and fix minefield Volcano disrupt and fix minefield.jpg
Volcano disrupt and fix minefield
Volcano turn and block minefield Volcano turn and block minefield.jpg
Volcano turn and block minefield

The Volcano system can emplace a minefield with an average density of 0.72 mines per metre for AT mines and 0.14 mines per metre for AP mines. The densities will vary slightly due to some mines failing to arm and self-destructing two to four minutes after dispensing. There may also be some mines that may not orient correctly when dispensed and not deliver their full blast effect. However, the probability of mines failing the arming sequence or not orienting correctly is relatively small and does not appreciably degrade the minefield lethality. For tracked vehicles entering a Volcano minefield, the AT density yields more than 80 percent probability of the vehicle encountering a mine. [1] [2]

The number of canisters and vehicles loads required to emplace a minefield depends upon the type of minefield required. Turn and block minefields are emplaced using the same basic procedures as those used for disrupt and fix minefields; however, turn and block minefields use two strips of mines, each strip with twice as many mines. The following table lists the number of mines required for each type of minefield of a given size: [3]

Type of minefieldDepth (metres)Front (metres)Number of stripsCanisters per stripTotal canistersVehicle loads
Disrupt140278140 (20 per side)400.25
Fix140278140 (20 per side)400.25
Turn340557280 (40 per side)1601
Block340557280 (40 per side)1601

From Aircraft (Air Volcano)

When fitted to an aircraft, mines are dispensed 35 to 70 metres (115 to 230 feet) from the aircraft's flight path. The aircraft flies at a minimum altitude of 5 feet (1.5 metres) at speeds ranging from 20 to 120 knots (37 to 222 kilometres per hour). One aircraft can dispense up to 960 mines per sortie. [3]

The Air Volcano DCU has a switch to select the aircraft's dispensing speed, with six airspeed settings - 20, 30, 40, 55, 80, and 120 knots. The recommended airspeed for dispersal is 40 knots; higher airspeeds should only be used if absolutely necessary. The time to dispense a load of Volcano munitions depends upon the airspeed as follows: [1]

KnotsDisrupt and Fix minefieldsTurn and Block minefieldsDispense 160 canisters
2027 seconds54 seconds108 seconds
3018 seconds36 seconds72 seconds
4013 seconds27 seconds54 seconds
559 seconds18 seconds39 seconds
806 seconds13 seconds27 seconds
1204 seconds9 seconds18 seconds
Minefield width (metres)2785571,115
No. passes per minefield121
No. canisters per pass4080160

When emplacing an Air Volcano minefield from a UH-60 Blackhawk helicopter, the door gunner is unable to operate the aircraft's machine gun. Therefore, if the minefield is being emplaced in an area with suspected or reported enemy activity, it is recommended that the Blackhawk is accompanied by an AH-64 Apache to provide suppressing fire if needed. [3]

From Ground Vehicles (Ground Volcano)

For ground vehicles, mines are dispensed 25 to 60 metres (82 to 197 feet) from the vehicle at ground speeds of 5 to 55 mph (8 to 89 km/h). A constant speed is maintained while the mines are being dispensed so as to attain a consistent mine density. The average time to emplace one load (160 canisters) is 10 minutes. After each load has been dispensed, the vehicle moves out of the minefield and marks the exit. Vehicle must then wait a minimum of 4 minutes before approaching or re-entering the minefield to allow faulty mines to self-destruct. [1]

Minefield Marking

US Army landmine warning signs US Army landmine symbols.jpg
US Army landmine warning signs

Once laid, minefields are marked to reduce the possibility of friendly forces triggering the mines, and in areas with civilian populations, to avoid collateral casualties. Operational doctrine specifies that: [1] [8]

Marking is by way of hazard signs attached to signposts and where appropriate, surrounded by boundary fences constructed from standard fencing materials such as barbed wire, concertina wire and pierced steel planking. Fence sections should be attached to steel or concrete fence posts set sufficiently into the ground to discourage locals from removing them for their own use. Hazard marking begins no less than 20 metres from the outer perimeter of the minefield with warning signs placed at regular intervals outside of the fenced area. [8]

Hazard signs are to be only those approved for U.S. Army use which follow international mine-marking conventions. There are two basic designs for the shape of a hazards sign—square or triangular, each marked with the standardised symbol of a skull and crossbones along with a printed warning of the hazard i.e. "DANGER MINES". When such signs are unavailable, the approved alternative is to use warning signs specifically denoting booby traps or unexploded ordnance (UXO). [8]

Dispenser Vehicles

The following ground vehicles and aircraft can be used to dispense the Volcano mines: [4]

Operators

British Army Alvis Stormer fitted with Shielder (Volcano) VLSMS 01.jpg
British Army Alvis Stormer fitted with Shielder (Volcano)

Current Operators

Potential Operators

Former Operators

See also

Notes

  1. Arming time is as per field manual FM 20-32; field manual FM 1-113 specifies arming times of 2 minutes and 15 seconds for the AT mine and 4 minutes for the AP mine.

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