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This weapon was of simple construction with a thick autofretted A tube, shrunk jacket and breech ring. The Welin breech-block opened upwards. Actual bore diameter was 20.30 cm (7.992"). |
Heavy Cruiser Dupleix in 1940
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This weapon was of simple construction with a thick autofretted A tube, shrunk jacket and breech ring. The Welin breech-block opened upwards. Actual bore diameter was 20.30 cm (7.992"). |
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Heavy Cruiser Dupleix in 1940
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| Designation | 203 mm/50 (8") Model 1924 |
| Ship Class Used On | Duquesne, Suffren and Surcouf classes |
| Date Of Design | 1924 |
| Date In Service | 1928 |
| Gun Weight | 20.389 tons (20.716 mt) |
| Gun Length oa | 413.4 in (10.5 m) |
| Bore Length | 399.6 in (10.150 m) |
| Rifling Length | 319.8 in (8.122 m) |
| Grooves | (60) 0.75 in deep x 0.295 in (1.9 mm x 7.5 mm) |
| Lands | 0.118 in (3.0 mm) |
| Twist | Uniform RH 1 in 25.59 |
| Chamber Volume | 5,595 in3 (91.682 dm3) |
| Rate Of Fire | Cruisers: 4 - 5 rounds per minute
Surcouf: 3 rounds per minute |
| Type | Bag |
| Projectile Types and Weights | APC M1936 - 295 lbs. (134 kg)
Other APC and HE were of several types and weighed 271.4 to 272.98 lbs. (123.1 to 123.82 kg) |
| Bursting Charge | APC M1936 - N/A
Other APC - about 8.7 lbs. (4.0 kg) HE - about 18.2 lbs. (8.3 kg) |
| Projectile Length | APC M1936 - 38.2 in (97 cm)
Others - 39.6 in (100.5 cm) |
| Propellant Charge | 103.6 lbs. (47 kg) BM 13 |
| Muzzle Velocity | APC M1936 - 2,690 fps (820 mps)
APC - 2,789 fps (850 mps) |
| Working Pressure | APC M1936 - about 19.0 tons/in2
(3,000 kg/cm2)
APC - 20.3 tons/in2 (3,200 kg/cm2) |
| Approximate Barrel Life | about 600 rounds |
| Ammunition stowage per gun | Surcouf: 300 rounds
Others: N/A |
| Note: The propellant charge was in halves. | |
| Elevation | With 271.4 lbs. (123.1 kg) APC Shells |
| Range @ 45 degrees | 34,340 yards (31,400 m) |
| Range @ 30 degrees | 30,620 yards (28,000 m) |
| Elevation | With 295 lbs. (134 kg) APC M1936 Shells |
| Range @ 45 degrees | about 32,800 yards (30,000 m) |
| Designation | Cruiser Two-gun Turret
Duquesne (4) and Suffren (4): Model 1924 Submarine Twin Mounting
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| Weight | Model 1924: 177 tons (180 mt)
Model 1929: N/A |
| Elevation | Model 1924: -5 / +45 degrees
Model 1929: -5 / +30 degrees |
| Elevation Rate | Model 1924: about 10 degrees per
second
Model 1929: N/A |
| Train | Model 1924: about +150 / -150 degrees
Model 1929: about +11 / -11 degrees |
| Train Rate | Model 1924: 6 degrees per second
Model 1929: N/A |
| Gun recoil | 27.5 in (70 cm) |
| Loading Angle | -5 / +10 degrees |
| Notes:
1) Model 1924 used catapult rammers cocked by the recoil forces. 2) Model 1929 could open fire within 2.5 minutes after the submarine surfaced. 3) Model 1924 gun axes were 74 in (188 cm) apart while those in Model 1929 were about 104 in (264 cm) apart. 4) Model 1924 used a 22.5 hp electric training motor with hydraulic drive and was equipped for RPC. Each gun used a 30 hp elevating electric motor and the guns could be coupled together. However, RPC for elevation was not fitted. |
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