Description

Post-war design used as AA on the Richelieu class battleships. These mountings were radar-controlled and had improved shell-handling capabilities compared to the pre-war 100 mm (3.9") Model 1930.

Barrel was an autofretted monobloc type with a semi-automatic sliding wedge breech mechanism.

Gun Characteristics

Designation 100 mm/55 (3.9") Model 1945
Ship Class Used On Richelieu Class
Prototype on Albatros
Date Of Design 1945
Date In Service 1948
Gun Weight 4,056 lbs. (1,840 kg) including breech
Gun Length oa N/A
Bore Length 216.5 in (5.500 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire 20 - 25 rounds per minute

Ammunition

Type Fixed
Weight of Complete Round 50.5 lbs. (22.9 kg)
Projectile Types and Weights 1 2 HE Model 1945: 29.36 (13.32 kg)
HE Model 1951: 29.36 (13.32 kg)
Bursting Charge N/A
Projectile Length N/A
Complete round: 42.8 in (108.8 cm)
Cartridge Case 100 X 1,145 mm (light alloy)
Propellant Charge 8.84 lbs. (4.01 kg) BM7
Muzzle Velocity 2,805 fps (855 mps)
Working Pressure 17.8 tons/in² (2,800 kg/cm²)
Approximate Barrel Life N/A
Ammunition stowage per gun 1,000 rounds 3
  1. ^HE rounds used German Zt Z S/30 mechanical time fuzes, later versions had a very sensitive nose fuze. The Model 1951 was intended for night firings.
  2. ^
    Actual French designations
    HE OEA Mle 1945 (day)
    HE OEA Mle 1951 (night)
    Starshell OEcl Mle 1945
  3. ^Outfit for Jean Bart in January 1957 consisted of 8,906 HE rounds (day), 3,000 HE rounds (night) and 600 Starshells.

Range

Range with 29.36 lbs. (13.32 kg) HE
Elevation Distance
40 degrees 18,590 yards (17,000 m)
45 degrees 18,880 yards (17,260 m)
AA Ceiling about 37,070 feet (11,300 m) max

Mount/Turret Data

Designation
  • Jean Bart (12): CAD Model 1945
  • Albatros (1) 1: Prototype CAD Model 1945, later production CAD Model 1945
Weight 58,532 lbs. (26,550 kg)
Elevation -8 / +70 degrees
Rate of Elevation N/A
Train -90 / +90 degrees
Rate of Train N/A
Gun Recoil N/A
Loading Angle Any

These mountings were controlled by four gyro-stabilised directors that were patterned after German designs. Train and elevation were controlled via a Ward Léonard RPC system and there were also semi-automatic and manual backup systems.

  1. ^Albatros was a destroyer converted to a gunnery training ship during 1947 - 1948. As part of the conversion, two of her 138.6 mm Model 1927 guns were landed and she was equipped with a variety of weapons including a German 10.5 cm Dop. L. C/37 mounting. This was replaced in 1951 with the prototype for the CAD Model 1945 which in turn was replaced by a production mounting in 1953.

Additional Pictures

Sources

Data from:

  • "Les Cuirassés: Dunkerque, Strasbourg, Richelieu & Jean Bart" by Robert Dumas
  • "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 Destroyers: Torpilleurs d'Escadre & Contre-Torpilleurs 1922 - 1956" by John Jordan and Jean Moulin

Special help by Matthew Rodchenko

Page History

21 May 2006
Benchmark
29 November 2009
Added photographs and information on projectiles
08 October 2015
Added information regarding Albatros