A slightly improved version of the 100 mm/47 Model 1928 and used in single mountings on smaller warships. Manufactured by OTO. Well-liked, but used in mountings with low maximum elevations which meant that they were not really suitable for the anti-aircraft role.
| Designation | 100 mm/47 (3.9") Models 1931, 1935 and 1937 |
|---|---|
| Ship Class Used On | Spica, Ariete, Orsa, Animoso and Gabbiano Classes |
| Date of Design | 1931, 1935 and 1937 |
| Date In Service | 1932 |
| Gun Weight | N/A |
| Gun Length oa | 196.3 in (4.985 m) |
| Bore Length | 185.0 in (4.700 m) |
| Rifling Length | N/A |
| Grooves | N/A |
| Lands | N/A |
| Twist | N/A |
| Chamber Volume | 473.5 in3 (7.76 dm3) |
| Rate Of Fire | 8 - 10 rounds per minute 1 |
- ^The Gabbiano class used an electric hoist that could supply 7 rounds per minute from the magazines to the gun.
| Type | Fixed |
|---|---|
| Complete Round Weight | N/A |
| Projectile Types and Weights | HE: 31.3 lbs. (14.2 kg) |
| Bursting Charge | N/A |
| Projectile Length | N/A |
| Propellant Charge | N/A |
| Muzzle Velocity | 2,805 fps (855 mps) 1a |
| Working Pressure | N/A |
| Approximate Barrel Life | N/A |
| Ammunition stowage per gun | Gabbiano: 200 rounds + 60 starshells Others: N/A |
- ^The muzzle velocity was originally 2,953 fps (900 mps) but this was reduced in an effort to reduce dispersion.
| Designation | |
|---|---|
| Weight | OTO 1935: 6.2 tons (6.3 mt) OTO 1937: 6.7 tons (6.8 mt) |
| Elevation | OTO 1931: -6 / +45 degrees Others: -10 / +60 degrees |
| Elevation Rate | Manually operated, only |
| Train | 360 degrees |
| Train Rate | Manually operated, only |
| Gun recoil | N/A |
Data from:
- "The Gabbiano Class Corvettes: Part 1" by Elio Andò in "Warship Volume IX"
- "Naval Weapons of World War Two" by John Campbell
- "Italian Warships of World War II" by Aldo Fraccaroli
- 16 May 2006
- Benchmark
- 26 May 2012
- Updated to latest template
- 23 September 2012
- Added picture of musuem gun
- 27 July 2014
- Added information on Gabbiano class