|
This weapon is described as having a vertically sliding breech block in "Naval Weapons of World War Two" but the photograph below shows quite clearly that it is horizontally sliding. |
La Argentina in 1950 |
4"/50 (10.2 cm) mounting now on display
at Museo Naval de la Nación, Buenos Aires, Argentina
|
Rear view of 4"/50 (10.2 cm) mounting now
on display at Museo Naval de la Nación, Buenos Aires, Argentina
|
| Designation | 4"/50 (10.2 cm) QF Vickers Armstrong Mark P |
| Ship Class Used On | La Argentina |
| Date Of Design | About 1935 |
| Date In Service | 1937 |
| Gun Weight | 2.175 tons (2.210 mt) including BM |
| Gun Length oa | 210.75 in (5.353 m) |
| Bore Length | 200.0 in (5.080 m) |
| Rifling Length | 166.807 in (4.347 m) |
| Grooves | (32) 0.039 x 0.270 in (1.00 x 6.86 mm) |
| Lands | 0.123 in (3.12 mm) |
| Twist | Uniform RH 1 in 30 |
| Chamber Volume | 499.8 in3 (8.19 dm3) |
| Rate Of Fire | 10 - 12 rounds per minute (?) |
| Type | Fixed |
| Weight of Complete Round | 57.75 lbs. (25.2 kg) |
| Projectile Types and Weights | HE - 31 lbs. (14.1 kg) |
| Bursting Charge | N/A |
| Projectile Length | N/A |
| Propellant Charge | N/A |
| Muzzle Velocity | 3,000 fps (914 mps) |
| Working Pressure | 19.0 tons/in2 (2,990 kg/cm2) |
| Approximate Barrel Life | N/A |
| Ammunition stowage per gun | N/A |
| Note: With such a high muzzle velocity, I would suspect that barrel life was rather short. | |
| Elevation | With 31 lbs. (14.1 kg) HE Shell |
| Range @ 45 degrees | 19,900 yards (18,200 m) |
| AA Ceiling @ 90 degrees | 37,400 feet (11,400 m) |
| Designation | Single Mounts
La Argentina (4) |
| Weight | N/A |
| Elevation | -5 / +90 degrees |
| Elevation Rate
(see Note) |
14 degrees per second |
| Train | About -50 to +50 degrees |
| Train Rate
(see Note) |
16 degrees per second |
| Gun recoil | N/A |
| Note: The elevation and train rate speeds given above assume that RPC was fitted to these mountings, but it is not known if this equipment was actually installed. | |