FV433 Abbot SPG

FV433 Field Artillery, Self-Propelled Abbot

Abbot SPG at the Firepower museum in London.
Type Self-propelled artillery
Place of origin United Kingdom
Service history
In service 1965–1995
Used by British Army, Indian Army
Production history
Manufacturer Vickers
Specifications
Weight 16.56 t (loaded without crew)
Length (gun forward) 5.8 m (20 ft)
Width 2.6 m (8 ft 6 in)
Height 2.5 m (8 ft 2 in)
Crew

Detachment of 6:

  • No. 1: Commander
  • No. 2: Loader & radio operator
  • No. 3: Layer
  • No. 4: Driver & Ammunition Handler
  • No. 5: Ammunition handler
  • No. 6: Second in command, and responsible for ammunition preparation.
Nos. 1–3 were turret crew, Nos. 5 and 6 travelled in the accompanying ammunition vehicle.
Armour 10 and 12 mm plate
Main
armament
 105 mm L13A1 gun, 40 rounds (including 6 rounds HESH) carried
Secondary
armament
  • 7.62 mm L4A4 MG with 1,200 rounds
  • smoke dischargers
Engine Rolls-Royce K60 Mk 4G multi-fuel opposed piston engine
240 bhp @ 3750 rpm
Power/weight 14.5bhp/tonne
Suspension torsion bar: 5 units per side
Operational
range
 480 km (300 mi)
Speed 47 km/h (29 mph)

FV433 Field Artillery, Self-Propelled "Abbot" is the self-propelled artillery variant of the British Army FV430 series of armoured fighting vehicles, using much of the chassis of the FV430 but with a fully rotating turret at the rear housing the 105 mm gun and given the vehicle designation of FV433.

Its correct designation was "Gun Equipment 105mm L109 (Abbot)"; L109 was little used, probably to avoid confusion with 155 mm M109 that entered UK service at about the same time. The name "Abbot" continued the Second World War style of naming self-propelled artillery after ecclesiastical titles. The FV433 used a different configuration of power pack from other vehicles in the FV430 series.

Development

Ammunition

A completely new ammunition family, comprising shells, fuzes and cartridges, was designed for Abbot's L13 gun, designated 105 mm Field (105 mm Fd). Compared to US 105 mm M1 type ammunition, it uses electrical instead of percussion primers, and has longer shells. The widely used US M1 type round was called "105 mm How" in UK service. The 105 mm Fd came in two marks, both separate loading (shell and cartridge loaded separately). The 105 mm Fd Mk 1 was used initially, it had a UK-produced 105 mm How shell, mostly US pattern fuzes and reduced charge 105 mm Fd cartridges with their electrical primers (105 mm M1 uses percussion primers).

The Mark 2 adopted a new projectile design including an improved lethality HE shell (heavier with more HE) and full charge cartridges. Its shell types include HE, Smoke, Coloured Marker (Red and Orange), Illuminating, and HESH for direct fire against enemy armoured vehicles. Direct Action, Controlled Variable Time (CVT) and Mechanical Time (MT) fuzes were available for HE and Coloured Marker shells.

Initially, there were three cartridges. Sub-zones 1 and 2 were only used to provide short range in high angle fire, and were soon replaced by a plastic spoiler slipped over the shell ogive. Normal cartridge gave charges 1–5, each bag being a different colour in accordance with established UK practice, Mk 1 normal cartridge only went to charge 4. Both marks had charge Super, a single charge cartridge, although the charge was reduced in Mk 1. Charges 5 and Super used extended "bags" that projected beyond the metal cartridge case. The 105 mm Fd uses double (often internationally called triple) base propellants designated N in UK service instead of the single based FNH propellants favoured by the US. The 105 mm Fd Mk 2 is still used with L118 Light Gun.

Gun

Maximum range with 105 mm Fd Mk 1 ammunition was 15 km, the Mk 2 gave 17.4 km. Maximum rate of fire was 6–8 rounds per minute.

The gun was able to elevate to 70 degrees and depress to -5 degrees, sufficient to engage enemy AFVs if necessary. Traverse and shell ramming were powered by electrical servo mechanisms, elevation and cartridge ramming were by hand.

Due to the number of charges and its compact turret, the Abbot did not have calibrating sights. Instead, the sight mount had both Tangent Elevation (TE) and Angle of Sight Scales and a separate Gun Rule to convert range into TE, corrected for the muzzle velocity variation from standard. The dial sight had all scales internal, illuminated and viewed through a single eyepiece.

Communications

The Abbot was fitted with both line and radio Larkspur B48, then Clansman UK/PRC 352) communications to its battery command post, which used the Apparatus Loud Speaking No. 23, this enabled the gun No. 1 to acknowledge his fire orders merely by clicking his pressel switch. Initially, it also used induction loop communications for the turret and external crew.

Shortly after the Field Artillery Computer Equipment (FACE) entered service in the early 1970s, the Gun Rule was removed and Artillery Weapon Data Transmission System (AWDATS) installed. AWDATS displayed firing data transmitted from FACE in the battery command post via either line or radio.

Mobility

The Abbot was able to swim across water, having a flotation screen fixed around the hull that was raised to provide buoyancy. The action of the tracks was sufficient to drive it forward at about 3 knots (see also DD Tank). Each Abbot was supported by a fully amphibious Stalwart Mk 2 High Mobility Load Carrier that carried additional ammunition.

Service history

The Abbot in the British Army was replaced by the AS-90 self-propelled gun in the mid 1990s. It is still in service with the Indian Army, though they are looking for a replacement.. No sources refer to Abbots ever being used in combat.

Ammunition

?, L43A2, L37A2, L31A1, L36
105mm Field Mark 1
105mm Field Mark 2

Variants

A simplified Value Engineered Abbot without flotation screen, NBC defence equipment, power traverse, elevation or loading, a simplified dial sight and communications fit was exported to India. A small number were purchased by the UK for use at the British Army Training Unit Suffield (BATUS) in Alberta, Canada.

A SPAAG version using an unmodified chassis with an alternate turret mounting two 30 millimetres (1.2 in) guns was prototyped as the "Falcon" but limited ammunition capacity led to its cancellation.

The Abbot's L13 105mm gun has been reproduced as a towed howitzer on a new carriage for the Indian Army.[1]

Operators

See also

References

  1. ↑ Kinard, Jeff. Artillery: An Illustrated History of Its Impact (2007 ed.). ABC-CLIO Publishers. pp. 301–302. ISBN 978-1-85109-561-2.
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