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.
| 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 |
| 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) |
| 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 |
"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
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