French
100 mm/45 (3.9") Model 1930
Updated 07 October 2006
Used 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.
WNFR_39-45_m1930_Algerie_pic.jpg

Amidships detail of Heavy Cruiser Algérie showing three of her twin 100 mm mounts
MB Photograph
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Gun Characteristics
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Designation 100 mm/45 (3.9") Model 1930
Ship Class Used On Richelieu and Algérie Classes
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 10 rounds per minute
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Ammunition
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Type Fixed
Weight of Complete Round 53.2 lbs. (24.2 kg)
Projectile Types and Weights HE - 29.7 lbs. (13.5 kg)
SAP - 32.96 lbs. (14.95 kg)
Bursting Charge N/A
Projectile Length N/A - Complete Round 39.8 in (1.011 m)
Propellant Charge 8.87 lbs. (4.03 kg)
Muzzle Velocity 2,575 fps (785 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A
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Range
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Elevation With 29.7 lbs. (13.5 kg) HE Shell
Range @ 45 degrees 17,388 yards (15,900 m)
AA Ceiling 32,280 feet (10,000 m)
Elevation With 32.96 lbs. (14.95 kg) SAP Shell
Range @ 45 degrees 17,280 yards (15,800 m)
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Mount / Turret Data
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Designation Twin Mount
   Richelieu (6) and Algérie (6):  Model 1931
Weight 13.3 tons (13.5 mt)
Elevation -10 / +80 degrees
Rate of Elevation N/A
Train About -80 / +80 degrees
Rate of Train N/A
Gun Recoil N/A
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Data from
"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.
"Cruisers of World War Two" by M.J. Whitley