| 203 mm /50 Model 1924 | |
| Origin: | Italy |
| Type: | Naval gun Coastal defense gun |
| Is Explosive: | yes |
| Is Artillery: | yes |
| Service: | 1928—1945 |
| Used By: | Italy |
| Wars: | World War II |
| Design Date: | 1924 |
| Manufacturer: | Ansaldo |
| Weight: | 21.4 metric tons |
| Length: | 10.53m (34.55feet) |
| Part Length: | 10.16m (33.33feet) 50 caliber |
| Cartridge Weight: | Early: 125.3kg (276.2lb) Late: 118kg (260lb) |
| Caliber: | 203mm |
| Rate: | 3 rpm |
| Velocity: | Early: 905m/s Late: 840m/s |
| Max Range: | Early: 31.32km (19.46miles) at +45° Late: 28km (17miles) at +45°[1] |
| Breech: | Welin breech block |
| Elevation: | -7° to +45° |
| Traverse: | -150° to +150°[2] |
The 203 mm /50 Model 1924 was an Italian 203 mm (8 inch) naval gun. Manufactured by the Ansaldo engineering company in the years before World War II for the Italian Navy, the use of these guns was limited to the Trento-class heavy cruisers and coastal defense batteries during the second world war.
These guns were of built-up construction with a fixed liner, autofretted barrel, and a Welin breech block. The gun mounts had electrically powered training, elevation, hoists and rammers. There was no swinging arm, and shell hoists were of pusher type with loading at +15°. These guns suffered from dispersion problems (due to the turret design of the Trento-class cruisers), so the original muzzle velocity of 905m/s was reduced to 840m/s for armor-piercing shells. Shell weight was also reduced from 125.3kg (276.2lb) to 118kg (260lb) in an attempt to resolve these problems, but these efforts were only partially successful. The main reason for the dispersion problem was because the guns were mounted too close together on a common cradle, which together with a narrow 4.52m (14.83feet) ball track complicated loading of the guns.[3]
This gun was limited to two superfiring twin-mount turrets forward and aft on the heavy cruisers Trento and Trieste during World War II.
One spare turret was used for coastal defense.
Ammunition was of separate loading type. The AP projectile was 84.7cm (33.3inches) long with a single bagged charge which weighed 47.3kg (104.3lb).
The gun was able to fire: