Britain
Vickers 3-pdr (1.4 kg) [1.85"/50 (47 mm)] QF Marks I and II
Updated 12 February 2012
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.
WNBR_3pounder_m2_Sir_John_Moore_pic.jpg

3-pdr on HA mounting
Monitor HMS Sir John Moore about 1918
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Gun Characteristics
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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
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Ammunition
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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
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Range
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Elevation With 3.3 lbs. (1.5 kg) HE Shell
Range @ 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)
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Mount / Turret Data
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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
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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 - Benchmark
12 February 2012 - Updated to latest template