French
100 mm/55 (3.9") Model 1945
Updated 21 May 2006
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.
WNFR_39-55_m1945_Richelieu_model_pic.jpg

A model of the French Battleship Jean Bart as she was completed in 1952
The 100 mm guns are in the larger twin turrets amidships
Photograph from Musées de la Marine
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Gun Characteristics
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Designation 100 mm/55 (3.9") Model 1945
Ship Class Used On Richelieu Class
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
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Ammunition
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Type Fixed
Weight of Complete Round N/A
Projectile Types and Weights HE Model 1945 - 29.36 (13.32 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge 8.84 lbs. (4.01 kg) B.M.7
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 325 rounds per twin mount
Note:  Outfit included 680 illumination rounds.
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Range
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Elevation With 29.36 lbs. (13.32 kg) HE Shell
Range @ 40 degrees 18,590 yards (17,000 m)
Range @ 45 degrees 18,880 yards (17,260 m)
AA Ceiling about 37,070 feet (11,300 m) max
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Mount / Turret Data
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Designation Twin Mount
  Jean Bart (12):  Model 1945
Weight 58,532 lbs. (26,550 kg)
Elevation -5 / +80 degrees
Rate of Elevation N/A
Train -90 / +90 degrees
Rate of Train N/A
Gun Recoil N/A
Loading Angle Any
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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.
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Special help by Matthew Rodchenko