.: Bob Williams' Tamiya 1/35th British 25 Pound Field Gun, Limber & Crew

Brand:
Tamiya (35046-800)
Scale:
1/35th
Modelling Time:
~ hrs
PE/Resin Detail:
none
Comments:

Completion Notes:
British 25 Pounder Field Gun and Ammunition Limber - with gun crew and officer (and an RTR, or possibly spotting a suspicious aircraft - in mid drink!)
Western Desert, 1942.
(for the "McCallum" Collection.)

Development Notes:
"Tamiya" 25 Pounder Field Gun (Howitzer) and limber, with gun crew. To be placed on a North Africa Campaign (Diorama) base. British."

for Rob McCallum

Ordnance QF 25 pounder

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This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. Please help to improve this article by introducing more precise citations. (January 2009)
Ordnance QF 25 pounder
25 Pounder Gun.JPG
Ordnance QF 25 pounder gun shown mounted on its firing platform, King Street West, Dundas, Hamilton, Canada.
Type Field gun/Howitzer
Place of origin United Kingdom
Service history
In service 1940-present
Used by See users
Wars World War II
Malayan Emergency
Korean war
Rhodesian Bush War
South African Border War
Dhofar Rebellion
Turkish invasion of Cyprus
Sri Lankan Civil War
Iraq War
Production history
Designed 1930s
Manufacturer Royal Ordnance
Variants See variants
Specifications (Ordnance QF 25 pounder Mk II on Carriage 25 pounder Mk I)
Weight 1,633 kg (3,600 lb)
Length 4.6 m (15 ft 1 in) (muzzle to towing eye)
Barrel length 2.47 m (8 ft 1 in)
Width 2.13 m (7 ft) (width at wheel hubs)
Height 1.16 m (3 ft 10 in) (trunnion height)
Crew 6

Shell High Explosive
Anti-Tank
Smoke
Shell weight 11.5 kg (25 lb) (HE including fuze)
Calibre 87.6 mm (3.45 in)
Breech Vertical sliding block
Recoil Hydro-pneumatic
Elevation -5° to 45°
(70° with dial sight adapter and digging trail pit or wheel mounds)
Traverse 4° Left & Right (top traverse)
360° (platform)
Rate of fire Gunfire, 6-8 rpm
Intense, 5 rpm
Rapid, 4 rpm
Normal, 3 rpm
Slow, 2 rpm
Very slow, 1 rpm
Muzzle velocity 198 - 532 m/s
(649 - 1,745 ft/s)
Maximum range 12,253 m (13,400 yd) (HE shell)
Sights Calibrating & reciprocating

The Ordnance QF 25 pounder, or more simply, 25-pounder or 25-pdr, was introduced into service just before World War II, during which it served as the major British field gun/howitzer. Combining high rates of fire with a reasonably lethal shell in a highly mobile piece, it was the British Army's primary artillery field piece well into the 1960s, with smaller numbers serving in training units until the 1980s. Many Commonwealth of Nations countries used theirs in active or reserve service until about the 1970s and ammunition for the weapon is currently being produced by Pakistan Ordnance Factories.

Design

The design was the result of extended studies looking to replace the 18 pounder (3.3 inches (84 mm) bore) field gun and the 4.5-inch howitzer (114.3 mm bore), which had been the main field artillery equipments during the First World War. The basic idea was to build one weapon with the direct-fire capability of the 18 pounder and the high-angle fire of the howitzer, firing a shell about half way between the two in size, around 3.5–4.0 inches (89–100 mm) of about 30 pounds (14 kg).

Development during the inter-war period was severely hampered by a lack of money and it was eventually decided to build a "new" design from existing 18 pounders by converting barrels but designing a new barrel and carriage for production when funds were available. The result was a 3.45 inches (87.6 mm) weapon firing a 25 pounds (11 kg). It was mounted on late model 18 pounder carriages. One of these used a circular firing platform and this was adopted for the new guns. The firing platform was lowered and the gun pulled onto it, providing a flat smooth surface for the road wheels that allowed the gunners to quickly traverse the weapon in any direction.

A 25-pdr field gun and limber being towed by a Morris Commercial "Quad", crossing a pontoon bridge at Slaght Bridge in Antrim, Northern Ireland, 26 June 1942.

Unlike the 18 pounder, the 25 pounder used howitzer type variable charge ammunition. For the Mk 1 Ordnance on 18 pounder carriage there were three "charges", Charge 1, 2 and 3 in a single cartridge. The 'proper' 25-pdr, Mk 2 Ordnance on Mk 1 Carriage, also had charge super in a separate cartridge. An increment for charge super was introduced in 1943 to provide higher velocity for anti-tank shot. Subsequently another type of increment was introduced to be added to charges 1 and 2 to provide three additional charge combinations for use with upper register (high angle) fire. The introduction of the increment to charge super was only possible following the addition of the muzzle-brake in the previous year.The 25-pdr was separate loading, the shell was loaded and rammed then the cartridge in its brass case was loaded and the breech closed. In British terminology the 25 pounder was called "Quick Firing" (QF) because the cartridge case provided obturation (it provided the gas seal in the breech) and was automatically released when the breech was opened.

In common with all British guns of the period the indirect fire sight was 'calibrating'. This meant that the range, not elevation angle was set on the sight. The sight compensated for the difference in the gun's muzzle velocities from standard. The gun was also fitted with a direct fire telescope for use with armour piercing shot. It also used 'one-man laying' in accordance with normal British practice.

An important part of the gun was the ammunition limber ("Trailer, Artillery, No 27"). The gun was hitched to it and the trailer hitched to the tractor when on tow. The gun did not need a limber[1] and could be hooked directly to a tractor. The trailer provided the brakes as only a hand brake was fitted to the gun carriage The trailer carried ammunition; thirty-two rounds in trays (two rounds per tray) in the trailer protected by two doors. Ammunition was also carried in the gun tractor with the detachment and various gun stores. Some stores, such as sights, were carried cased on the gun. Each section (two guns) had a third tractor that carried ammunition and towed two ammunition trailers.

The gun detachment comprised the following: No 1 - detachment commander (a sergeant), No 2 - operated the breech and rammed the shell, No 3 - layer, No 4 - loader, No 5 - ammunition, No 6 - ammunition, normally the 'coverer' - second in command and responsible for ammunition preparation and operating the fuze indicator.

The official 'reduced detachment' was 4 men.

Many different Companies manufactured the guns and component parts in the UK. Vickers Armstrong in Scotswood, Baker Perkins in Peterborough and Weirs in Glasgow were some of the most significant. The various Royal Ordnance factories produced most of the ordnance components. In Canada Sorel Industries built complete guns and provided the ordnance for fitting to the Sexton. Australia also built complete guns, choosing to weld the carriages rather than rivet, as was the practice in the UK and Canada. In all, over 13,000 were made world wide.

Please go to Wikipedia, if you want any further information

Thanks Wikipedia!

Progress Shots from May 2013

That Howitzer recoil can knock your head off!

Click on each image for a closer look

Progress Shots from May 2013

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