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Model 1918 was in single mounts, Model 1918/19 was the same weapon but in twin mountings. Models 1924 and 1926 were very similar and were in twin mountings. This or a similar weapon was used on the Brazilian submarine Humaita, which was built during 1927-28 by Odero-Terni, Spezia. |
Destroyer Nazario Sauro |
| Designation | 120 mm/45 (4.7") Models 1918, 1924 and 1926 |
| Ship Class Used On | Leone, Sauro, Turbine and Sella classes
Older guns used on minor warships |
| Manufacturer | Schneider-Canet-Armstrong: 1918
and 1918/19
Vickers-Terni: 1924 OTO: 1926 |
| Date of Design | 1918 (1924 and 1926) |
| Date In Service | 1919 |
| Gun Weight | 9,600 lbs. (4,354 kg) |
| Gun Length oa | 196.3 in (4.985 m) |
| Bore Length | 212.6 in (5.400 m) |
| Rifling Length | N/A |
| Grooves | N/A |
| Lands | N/A |
| Twist | N/A |
| Chamber Volume | N/A |
| Rate Of Fire | 7 rounds per minute |
| Type | Bag (may have been separate) |
| Projectile Types and Weights | HE - 48.5 lbs. (22 kg)
AP - 51.0 lbs. (23.15 kg) |
| Bursting Charge | N/A |
| Projectile Length | N/A |
| Propellant Charge | 16.75 lbs. (7.6 kg) |
| Muzzle Velocity | Model 1918: 2,460 fps (750 mps)
Others: 2,789 fps (850 mps) |
| Working Pressure | N/A |
| Approximate Barrel Life | N/A |
| Ammunition stowage per gun | N/A |
| Elevation | With 48.5 lbs. (22 kg) HE shell |
| Range @ 33 degrees | 16,950 yards (15,500 m) |
| Designation | Single Mount
AMCs, troop transports: M1918 Sela (1): M1924 Twin Mount
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| Weight | Single: N/A
Twin: 16.6 tons (16.9 mt) |
| Elevation | Model 1918: -10 / +30 degrees
Model 1918/19: -10 / +32 degrees Model 1924 and 1926: -10 / +33 degrees |
| Elevation Rate | Manual operation, only |
| Train | about +150 / -150 degrees |
| Train Rate | Manual operation, only |
| Gun recoil | N/A |
| Notes:
1) The Sella class originally had a single gun on the bow, but this was replaced in 1929 by a twin mounting. 2) The twin mountings had the guns only 22.8 in (58 cm) apart and suffered from dispersion problems as a result. |
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