BL 5.5 inch Medium Gun
Encyclopedia
The BL 5.5 inch Gun was a British
artillery
gun introduced during the middle of the Second World War to equip medium batteries.
. Subsequently it also equipped Canadian, Australian, South African, Polish and Indian regiments, and after the war, it was also used by New Zealand. In the Second World War the normal organisation was a regiment of 16 guns organised into two batteries.
The 5.5 was retained in service after the war. It was used by the Royal Artillery on operations in Korea, South Arabia and Borneo. It was (probably) used by the Indian Army in wars against Pakistan.
The South African Defence Force
used it extensively in the early stages of the South African Border War
, including Operation Savannah
, calling it the G2.
In British post-war service it also replaced the 4.5 inch Gun. When 6 gun batteries were introduced in the late 1950s, medium regiments had 18 guns and the third battery in each field regiment was equipped with 5.5 inch guns instead of 25 pounder guns. It remained in UK service with Territorial Army regiments until 1980 and in Australian service until replaced by M198 in about 1984.
The UK replacement for 5.5 inch was the FH-70
155 mm towed howitzer, in service as L121. The last 5.5 rounds were fired in the UK in 1995.
In use, the 5.5 was generally towed by the AEC Matador
artillery tractor
. From the 1950s in British service, the 5.5 was typically towed by an AEC Militant Mk 1 6x6 truck and subsequently the FV 1103 6x6 Medium Artillery Tractor built by Leyland.
All 5.5 guns were manufactured in the UK.
During World War II the PL Locks and AC Slide Boxes used with 0.5 inch tubes were replaced by PK Locks and Y Slide Boxes using 0.303 inch tubes.
It used one man laying and had Probert pattern calibrating sights. The Dial Sight was initially the No 7 but was gradually replaced by the No 9. In the 1960s sights were converted from degrees, minutes and yards to mils and metres. There was no anti-tank telescope. Late in the war a sight adapter was introduced to permit upper register (high angle) fire when the wheels were raised significantly above the level of the spades.
The normal gun detachment was 10 men.
In 1944 an 82 lb shell (8/16 crh) was introduced along with Charge Super giving a maximum range table MV of 1950 feet per second and 18,100 yards. The lighter shell contained 1.5 lbs more HE and gradually replaced the heavier shell.
In addition to HE there were several chemical (90 – 98 lbs) and coloured smoke shells (100 lb only), coloured flare was developed. After the war only HE was used.
The normal HE fuze was No 117. In late 1944 a VT fuze T100 became available.
to tow 17 pounder anti-tank guns). It was a turretless design with no casemate. The second, FV3805, in the 1950s used a Centurion tank
carriage, the gun being in a barbette mounting in a fully enclosed casemate.
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...
artillery
Artillery
Originally applied to any group of infantry primarily armed with projectile weapons, artillery has over time become limited in meaning to refer only to those engines of war that operate by projection of munitions far beyond the range of effect of personal weapons...
gun introduced during the middle of the Second World War to equip medium batteries.
History
In January 1939 a specification was issued for a gun to replace the 6 inch 26 cwt howitzers in use with most medium batteries. The first units were equipped in UK in the summer of 1941 and in North Africa a year later, 20 guns equipped British and Free French batteries at El AlameinEl Alamein
El Alamein is a town in the northern Matrouh Governorate of Egypt. Located on the Mediterranean Sea, it lies west of Alexandria and northwest of Cairo. As of 2007, it has a local population of 7,397 inhabitants.- Climate :...
. Subsequently it also equipped Canadian, Australian, South African, Polish and Indian regiments, and after the war, it was also used by New Zealand. In the Second World War the normal organisation was a regiment of 16 guns organised into two batteries.
The 5.5 was retained in service after the war. It was used by the Royal Artillery on operations in Korea, South Arabia and Borneo. It was (probably) used by the Indian Army in wars against Pakistan.
The South African Defence Force
South African Defence Force
The South African Defence Force was the South African armed forces from 1957 until 1994. The former Union Defence Force was renamed to the South African Defence Force in the Defence Act of 1957...
used it extensively in the early stages of the South African Border War
South African Border War
The South African Border War, commonly referred to as the Angolan Bush War in South Africa, was a conflict that took place from 1966 to 1989 in South-West Africa and Angola between South Africa and its allied forces on the one side and the Angolan government, South-West Africa People's...
, including Operation Savannah
Operation Savannah (Angola)
Operation Savannah was the name given to the South African Defence Force's 1975–1976 covert intervention in the Angolan Civil War.-Background:...
, calling it the G2.
In British post-war service it also replaced the 4.5 inch Gun. When 6 gun batteries were introduced in the late 1950s, medium regiments had 18 guns and the third battery in each field regiment was equipped with 5.5 inch guns instead of 25 pounder guns. It remained in UK service with Territorial Army regiments until 1980 and in Australian service until replaced by M198 in about 1984.
The UK replacement for 5.5 inch was the FH-70
FH-70
The FH-70 is a towed howitzer in use with several nations.-History:In 1963 NATO agreed a NATO Basic Military Requirement 39 for close support artillery, either towed or tracked. Subsequently Germany and UK started discussions and design studies and in 1968 established Agreed Operational...
155 mm towed howitzer, in service as L121. The last 5.5 rounds were fired in the UK in 1995.
In use, the 5.5 was generally towed by the AEC Matador
AEC Matador
The AEC Matador was an artillery tractor built by the Associated Equipment Company for British and Commonwealth forces during the Second World War.AEC had already built a 4 x 2 lorry, also known as the Matador ....
artillery tractor
Artillery tractor
Artillery tractor is a kind of tractor, also referred to as a gun tractor, a vehicle used to tow artillery pieces of varying weights.-Traction:...
. From the 1950s in British service, the 5.5 was typically towed by an AEC Militant Mk 1 6x6 truck and subsequently the FV 1103 6x6 Medium Artillery Tractor built by Leyland.
All 5.5 guns were manufactured in the UK.
Description
There were four marks of 5.5 inch ordnance although only 3 and, after World War II, 4 entered service, and the differences were only minor. There were two marks of carriage where the differences were greater use of welding and less of riveting. The carriages were identical to those used with Ordnance BL 4.5 inch Mark 2. No limber was ever used and the gun fired with its wheels in contact with the ground.During World War II the PL Locks and AC Slide Boxes used with 0.5 inch tubes were replaced by PK Locks and Y Slide Boxes using 0.303 inch tubes.
It used one man laying and had Probert pattern calibrating sights. The Dial Sight was initially the No 7 but was gradually replaced by the No 9. In the 1960s sights were converted from degrees, minutes and yards to mils and metres. There was no anti-tank telescope. Late in the war a sight adapter was introduced to permit upper register (high angle) fire when the wheels were raised significantly above the level of the spades.
The normal gun detachment was 10 men.
Ammunition
Initially 5.5 inch fired a 100 lb shell (6/12 crh) and 4 charges in two cartridges giving a maximum range table MV of 1675 feet per second and 16,200 yards.In 1944 an 82 lb shell (8/16 crh) was introduced along with Charge Super giving a maximum range table MV of 1950 feet per second and 18,100 yards. The lighter shell contained 1.5 lbs more HE and gradually replaced the heavier shell.
In addition to HE there were several chemical (90 – 98 lbs) and coloured smoke shells (100 lb only), coloured flare was developed. After the war only HE was used.
The normal HE fuze was No 117. In late 1944 a VT fuze T100 became available.
Variants
No variants entered service although UK developed two self-propelled versions to prototype stage. The first in 1945 used the Crusader gun tractor (developed from the Crusader tankCrusader tank
The Tank, Cruiser, Mk VI or A15 Crusader was one of the primary British cruiser tanks of the early part Second World War and perhaps the most important British tank of the North African Campaign...
to tow 17 pounder anti-tank guns). It was a turretless design with no casemate. The second, FV3805, in the 1950s used a Centurion tank
Centurion tank
The Centurion, introduced in 1945, was the primary British main battle tank of the post-World War II period. It was a successful tank design, with upgrades, for many decades...
carriage, the gun being in a barbette mounting in a fully enclosed casemate.