A more powerful gun than the Hotchkiss 3-pdr, this weapon was used as a secondary gun on cruisers and later as an AA weapon during World War I.

Actual bore length was 50.05 calibers.

Gun Characteristics

Designation Vickers 3-pdr (1.4 kg) [1.85"/50 (47 mm)] QF Marks I and II
Ship Class Used On Many
Date Of Design N/A
Date In Service about 1900
Gun Weight about 650 lbs. (295 kg)
Gun Length oa 98.9 in (2.512 m)
Bore Length 92.6 in (2.352 m)
Rifling Length N/A
Grooves (20) Uniform RH 1 in 30
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire 25 rounds per minute


Type Fixed
Weight of Complete Round HE: 6.6 lbs. (3.0 kg)
Projectile Types and Weights HE: 3.3 lbs. (1.5 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge 0.83 - 1.0 lbs. (0.38 - 0.45 kg)
Muzzle Velocity HE: 2,575 fps (785 mps)
Working Pressure N/A
Approximate Barrel Life about 5,000 rounds
Ammunition stowage per gun Monitors of World War I carried 300 rounds per gun


Range with 3.3 lbs. (1.5 kg) HE
Elevation Distance
12 degrees 5,600 yards (5,120 m)
AA Ceiling @ 80 degrees 15,000 feet (4,570 m)
Effective AA Range about 2,000 yards (1,800 m)

Mount/Turret Data

Designation Single LA Mountings: Mark I and Mark II
Single HA Mountings: Mark III HA
Weight 0.7 tons (0.8 mt)
Elevation Marks I and II: -5 / +30 degrees
Marks III HA: -5 / +80 degrees
Elevation Rate Manually operated, only
Train 360 degrees
Train Rate Manually operated, only
Gun recoil N/A


Data from:

  • "Big Gun Monitors: The History of the Design, Construction and Operation of the Royal Navy's Monitors" by Ian Buxton
  • "British Cruisers of World War Two" by Alan Raven and John Roberts

Page History

13 May 2006
12 February 2012
Updated to latest template