The Model 1930 as a mid-range anti-aircraft gun, replacing some of the unsuccessful 152 mm DP guns on the Richelieu class battleships. Also used on the Heavy Cruiser Algérie. Used an autofretted barrel and a semi-automatic breech mechanism. Loading was by spring-powered rammers. These guns were in a single cradle and fired fixed ammunition.

The Model 1933 was an improved version which did not see service use. Unless otherwise noted, the data below is for the Model 1930.

Gun Characteristics

Designation 100 mm/45 (3.9") Model 1930
100 mm/45 (3.9") Model 1933
Ship Class Used On Model 1930: Lorraine, Richelieu and Algérie Classes
Model 1933: Elan, Chamois, Le Fier, De Grasse, Clemenceau and Gascogne
Date Of Design 1930
Date In Service 1939
Gun Weight 3,629 lbs. (1,620 kg)
Gun Length oa N/A
Bore Length 177.2 in (4.500 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire Theoretical: 16 rounds per minute
Practical: 10 rounds per minute


Type Fixed
Weight of Complete Round 1 SAP: 53.2 lbs. (24.2 kg)
HE: 50.0 lbs. (22.7 kg)
Starshell: N/A
Projectile Types and Weights SAP: 32.96 lbs. (14.95 kg)
HE: 29.7 lbs. (13.5 kg)
Starshell: N/A
Bursting Charge N/A
Projectile Length N/A: Complete Round 39.8 in (1.011 m)
Propellant Charge 8.6 lbs. (3.9 kg) BM7
Muzzle Velocity SAP: 2,510 fps (765 mps)
HE: 2,559 fps (780 mps)
Starshell: N/A
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun Richelieu: 400 rounds 2
De Grasse: 300 rounds
Others: N/A
  • ^
    Actual French designations
    SAP OPf Mle 1928
    HE OEA Mle 1928
    Starshell OEcl Mle 1928
  • ^Richelieu carried no more than 10 rounds of SAP per gun as it was considered to be unnecessary given her powerful secondary armament of 152 mm (6") guns.


Range with 29.7 lbs. (13.5 kg) HE
Elevation Distance
45 degrees 17,388 yards (15,900 m)
AA Ceiling 32,280 feet (10,000 m)
Range with 32.96 lbs. (14.95 kg) SAP
Elevation Distance
45 degrees 17,280 yards (15,800 m)

Mount/Turret Data

Designation Twin Mount
   Lorraine (4), Richelieu (6) and Algérie (6): Model 1931 1a
   Elan (1), Chamois (1), Le Fier (2), De Grasse (3), Clemenceau (6) and Gascogne (8): Model 1937
Weight Model 1931: 13.3 tons (13.5 mt)
Model 1937: 29.3 tons (29.8 mt) 2a
Elevation Model 1931: -10 / +80 degrees
Model 1937: -10 / +90 degrees
Rate of Elevation N/A
Train About -80 / +80 degrees
Rate of Train N/A
Gun Recoil N/A
  • ^The Model 1931 was open-back and the Model 1930 guns shared a single cradle. Distance between gun axes was 23.6 inches (60 cm). The mountings on Lorraine were removed and installed on Richelieu along with two other mountings from the Niolon Battery near Marseille.
  • ^The Model 1937 was an enclosed mounting with the Model 1933 guns individually sleeved and did not enter service use. This was originally designed for small minesweeping sloops and had two pusher hoists per gun, one for ASu and one for AA, which turned with the mounting. Weight given above is for the original design which was for small warships and had 4 mm plating. Mountings for the battleships would have had 30 mm plating and larger servo-motors.


"Naval Weapons of World War Two" by John Campbell
"Battleships: Allied Battleships in World War II" by W.H. Garzke, Jr. and R.O. Dulin, Jr.
"French Battleships: 1922 - 1956" by John Jordan and Robert Dumas
"French Cruisers: 1922 - 1956" by John Jordan and Jean Moulin
"Cruisers of World War Two" by M.J. Whitley Page History

Page History

07 October 2006 - Benchmark
29 November 200 - Added photograph of Richelieu, information on projectiles and Model 1937 Mounting
29 March 2013 - Added ammunition details
26 December 2022 - Converted to HTML 5 format, minor formatting changes