Guns of generally similar construction and performance but built by different manufacturers.
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.
| Designation | 120 mm/45 (4.7") Models 1918, 1924 and 1926 |
|---|---|
| Ship Class Used On | Leone, Sauro, Turbine and Sella classes |
| Manufacturer | Schneider-Canet-Armstrong: Models 1918 and 1918/19
Vickers-Terni: Model 1924 OTO: Model 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 | Distance |
|---|---|
| 33 degrees | 16,950 yards (15,500 m) |
| Designation | Single Mount
AMCs, troop transports: M1918 Sella (1): M1918 Twin Mount
|
|---|---|
| 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 |
- ^The Sella class originally had a single gun on the bow, but this was replaced in 1929 by a M1926 twin mounting. It would appear that the stern mount was also changed to a M1926 at this time or it could have always been a M1926 twin mount.
- The twin mountings had the guns only 22.8 in (58 cm) apart and suffered from dispersion problems as a result.
"Naval Weapons of World War Two" by John Campbell
"Italian Warships of World War II" by Aldo Fraccaroli
"Destroyers of World War Two" by M.J. Whitley
07 January 2008 - Benchmark
17 January 2017 - Converted to HTML 5 format and minor changes
03 January 2022 - Re-did photograph of Nazario Sauro, minor formatting changes