Anti-aircraft gun designed by Bofors for Coastal Defense ships. Used a semi-automatic horizontal sliding breech block.

Actual overall length was 50 calibers.

Gun Characteristics

Designation 105 mm/50 (4.1") Model 1932 Bofors
Ship Class Used On Väinämöinen class
Date Of Design about 1930
Date In Service 1932
Gun Weight 2.51 tons (2.55 mt) with breech mechanism
Gun Length oa 206.7 in (5.250 m)
Bore Length about 194.3 in (4.935 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire 15 rounds per minute 1
  • ^Automatic rammers powered from hydro-pneumatic accumulators gave these guns a high rate of fire.


Type Fixed
Complete Round Weight HE: 55.6 lbs. (25.2 kg)
Projectile Types and Weights HE: 35.3 lbs. (16 kg)
Bursting Charge HE: N/A
Projectile Length N/A
Propellant Charge 9.04 lbs. (4.1 kg)
Muzzle Velocity 2,625 fps (800 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A


Range with 35.3 lbs. (16 kg) HE Shell
Elevation Distance
45 degrees 19,900 yards (18,200 m)
AA ceiling @ 85 degrees 39,400 feet (12,000 m)

Mount/Turret Data

Designation Twin Mounts: Väinämöinen (4)
Weight 21.75 tons (22.1 mt)
Elevation -10 / +85 degrees
Elevation Rate Hand operated, only
Train about -/+ 100 degrees
Train Rate Hand operated, only
Gun recoil N/A

It is unclear from photographs if there was any sort of time-fuze setting mechanism in the mounting. The fuzes may have needed to be set by hand. If so, then these weapons would have been limited to barrage firing.


Data from:

  • "Naval Weapons of World War Two" by John Campbell