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

Off-site Resources


"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 - Benchmark
12 February 2012 - Updated to latest template
24 April 2023 - Converted to HTML 5 format, added link to HMS Hampshire gun