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G-1 88 mm Light Gun

South African 88mm light artillery gun, better known as the British 25pounder of World War 2 fame

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aa.WeaponQF 88mm G-1 Field Gun
abDescriptionMajor British field gun and howitzer during World War II. used by the SADF during the Border War from 1975 to 1988
ac.TypeTowed Field Artillery
ad.Calibre87.5 mm (3.45 in)
ae.Overall Length2.4 m (7.87 ft)
af.Overall Width2.13 m (6.99 ft)
ag.OverallHeight1.69 m (5 feet 6 3/4 inches)
ai.Country of OriginUnited Kingdom
aj.AmmunitionHE: 11.5 kg (25 lb) (HE including fuze)
AP: 9.1 kg (20 pounds); solid armour-piercing (AP); later replaced with a more potent version with a ballistic cap (APBC)
ak.Effective Range (HE)Shell Propellant Normal:
Charge 1: 915 m - 3 566 m
Charge 2: 2 285 m - 7 130 m
Charge 3: 3 200 m - 10 575 m
Shell Propellant Charge Super:
100 m - 12 250 m (13 396 yards)
al.Muzzle Velocity (HE)198 to 532 m/s (650 to 1,750 ft/s)
ba.Feed MechanismQuick Firing (QF), Single Shot, Breech Loaded; Separate Loading Multi-Charge
bbTraverse4° Left and right with wheels and 360° on platform
bd.Rate of Fire5 rpm (heavy)
4 rpm (fast)
3 rpm (normal)
2 rpm (slow)
1 rpm (very slow)
be.SightsIndirect Fire: Calibrating & Reciprocating No. 9 Dial Sight & Probert Range Scale Cone;
Direct Fire: Telescopic
bf.Muzzle Energy 
bg.Barrel Length2 712.5mm (106.69 in) - 31 cals
bh.Weight of Barrel 
bi.RiflingAutofrettaged loose liner; 26 grooves, one turn in 20 calibres
bk.RecoilHydraulic buffer with a hydro-pneumatic recuperator
bl.Firing Support Base360° Platform
bn.Type of Breech BlockVertical sliding block with a mechanical firing lock
boWeight of Breech Mechanism 
bp.TrailsBox type
bq.Suspension SystemNone
br.Type of Firing MechanismFired by a lever placed on the left side operated through a mechanical linkage
bs.CarriageBox trail & platform
bt.MobilityTowed by a 3-ton gun tractor (Bedford R-Series or Mercedes-Benz)
bu.Wheels2 x 900x16 inch (FB Rims); Tire Pressure. 245 Kpa
bv.Ground Clearance343 mm (13.5 in)
by.Wheel Span2.13 m (6.99 ft)
bz.LubricantsGun. Grease Molykote BR 2, Chassis Grease Snell Alvania and SAE 30 oil
Recoil System. Compressed air and Aeroshell Fluid 1.
ca.PropellantUsually a brass cartridge case with its integral primer, The case provides obturation. The cartridge would contain three coloured bags of propellant: red for Charge 1, red and white for Charge 2, and red, white and blue for Charge 3; and a second cartridge for Charge Super.
cb.Detonation MechanismDirect Impact Fuze No. 117: the standard fuze, minimum angle of descent 8 degrees
Time Fuze No. 221: a time and percussion fuze used with streamlined base ejection smoke, star, flare and chemical shells. The time function was by combustion. 50 second maximum time.
cj.DesignerThe Director, Royal Artillery, Major General H.A. Lewis, ordered construction of the first 25-pounder gun
cl.ManufacturerVickers, on behalf of Royal Ordnance
cm.ProducedOver 13,000. At least 12,253 were built in Britain alone.
cn.VariantsMark I: "Ordnance, Quick Firing 25-pounder Mark I on Carriage 18-pr Mark IV", or "Ordnance, Quick Firing 25-pounder Mark I on Carriage 18-pr Mark V" and commonly called the "18/25-pounder"
Mark II: The Mark II, fitted to the Mark I carriage was the standard gun during World War II.
Mark II/I: A programme introduced in 1946 to modify the gun's breech ring by morticing the rear corners.
Mark III: The Mark III ordnance was a Mark II with a modified receiver to prevent the rounds from slipping back out when loading at high angles, introduced in January 1944.
Mark III/I: This was a Mk III gun with the same modification to the ring and block as for the Mk II/I.
Mark IV: The Mark IV was identical to the Mark III/I, and featured the modified ring and a paired block from new.
Short, Mark I: The 25-pounder Short Mark I, or Baby 25-pr, was an Australian pack gun version of the 25-pounder, first produced in 1943.
Mark I: The first real 25-pounder carriage.
Jury axle: A local modification to use a Jeep axle and wheels to produce a 20-inch narrower wheelbase for easier movement along restricted jungle paths in Burma.
Mark II: Basically the War Office-approved formalisation of the Jury Axle version of the 25-pounder. Mark III: A further development of the Mark II carriage to provide joints that enabled the trail to be cranked for "upper register" (high-angle) fire.
Mark IV: Further work on the Australian-designed short 25-pounder, enabling it to fire charge Super, but never went into production.
co.In Service1940 - present
cp.ProliferationAustralia; Belgium ; Brazil; Canada ; Cyprus; Fiji ; Greece; India; Iraq; Ireland; Jordan; Kingdom of Italy; Lebanon; Luxembourg; Malta; Nazi Germany; New Zealand; Oman; Paraguay; Poland; Pakistan; Portugal; Rhodesia ; Singapore; South Africa; Sri Lanka; Suriname; United Kingdom; Zimbabwe; Kurdistan
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