Description

Gas-operated, air-cooled automatic gun developed for both land and naval use and based on the Wehrmacht Flak 41. Used a vertical sliding breech block and was percussion fired. Only three prototypes were completed before the end of World War II. Interesting in that no alloy steels were to be used in its construction, a reflection of the growing shortages in Germany as World War II neared its end. Extensive use was made of stamped sheet-metal components in order to simplify production.

Used a five-round ammunition clip and the gun fired with the breech locked as it moved forward from recoil.

Gun Characteristics

Designation 5.5 cm/77 (2.165") Gerät 58
Ship Class Used On Planed for the Type 1942C destroyers
Date Of Design 1944
Date In Service N/A (prototypes, only)
Gun Weight 1,430 lbs. (650 kg)
Gun Length oa 242.1 in. (6.150 m)
Barrel Length 166 in (4.220 m)
Rifling Length 148 in. (3.750 m)
Grooves (20) 0.030 in deep x 0.171 in (0.75 mm x 4.34 mm)
Lands 0.169 in (4.3 mm)
Twist Increasing RH 1 in 90 to 1 in 25.6
Chamber Volume N/A
Rate Of Fire 120 - 150 rounds per minute cyclic
140 rounds per minute practical
Could also be fired in single-shot mode

Ammunition

Type Fixed
Weight of Complete Round 11.8 lbs. (5.3 kg)
Projectile Types and Weights AA: 4.4 lbs. (2.0 kg)
Bursting Charge about 1.07 lbs. (0.485 kg)
Projectile Length N/A - Complete Round 26.2 in (665 mm)
Propellant Charge 2.4 lbs. (1.1 kg) Gudol RP
Cartridge 55 x 450B
Muzzle Velocity 3,350 - 3,445 fps (1,020 - 1,050 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A

Ammunition design was not finalized at the end of the war and many experimental shells were found at the development site.

Range

Range with 4.4 lbs. (2.0 kg) Shell
Elevation Distance
45 degrees about 4,370 yards (4,000 m) effective
AA Ceiling @ 80 degrees about 6,900 feet (2,500 m) effective
Flight Time with 4.4 lbs. (2.0 kg) Shell
Muzzle Velocity Distance Time
3,350 fps (1,020 mps) 1,090 yards (1,000 m) 1.10 seconds
2,190 yards (2,000 m) 2.50 seconds
3,280 yards (3,000 m) 4.34 seconds
4,370 yards (4,000 m) 6.75 seconds

Mount / Turret Data

Designation Single Mounts
Weight Static Mounting: 7,720 lbs. (3,500 kg)
Elevation about -10 / 90 degrees
Elevation Rate N/A
Train 360 degrees
Train Rate N/A
Gun recoil N/A

Various types of mountings were under investigation, including triaxial and quadaxial designs as well as an Army biaxial mounting.

Sources

"Naval Weapons of World War Two" by John Campbell
"German Warships 1815-1945" by Erich Gröner
"German Artillery of World War Two" by Ian Hogg
"Rapid Fire" by Anthony G. Williams

Page History

05 August 2006 - Benchmark
20 May 2012 - Added Cartridge Data
21 August 2019 - Converted to HTML 5 format, additional data on gun and ammunition