The after section of Emile Bertin showing the 90 mm twin mounting
Sketch of 90 mm/50 Model 1926 gun and ammunition
|Designation||90 mm/50 (3.5") Model 1926|
|Ship Class Used On
(see Note 1)
|Cruisers: Suffren, Emile Bertin
and La Galissonnière Classes
Net-layer Gladiateur and some escorts of the Élan and Chamois classes
Fitted as emergency AA on Jean Bart
|Date Of Design||1926|
|Date In Service||1931|
|Bore Length||177.2 in (4.500 m)|
|Rate Of Fire
(see Note 2)
|12 - 15 rounds / minute|
1) All members of the Suffren class except Suffren herself carried this gun as their secondary battery. Suffren carried the older 76 mm/50 Model 1924.
2) Loading proved difficult at elevations above 60 degrees and ROF dropped to around 10 rounds per minute.
3) The Emile Bertin had an inadequate ammunition supply system which could only supply 20 rounds per minute for all four guns.
|Weight of Complete Round||39.7 lbs. (18 kg)|
|Projectile Types and Weights
|HE - 20.96 lbs. (9.51 kg)
Incendiary - N/A
Starshell - N/A
|Projectile Length||15.2 in (38.5 cm)|
|Propellant Charge||6.83 lbs. (3.1 kg) BM5|
|Muzzle Velocity||2,789 fps (850 mps)|
|Approximate Barrel Life||N/A|
|Ammunition stowage per gun
(see Note 2)
|Suffren - 500 rounds
Emile Bertin - 250 rounds
La Galissonnière - 300 rounds
Others - N/A
1) Actual French designations:
2) The Emile Bertin class had ammunition space for 1,422 rounds but the standard combat loading was 1,000 HE plus 200 illumination rounds for the center mounting. La Galissonnière carried 2,400 HE and 200 illumination rounds.
|Elevation||With 20.96 lbs. (9.51 kg) HE Shell|
|Range @ 45 degrees||16,885 yards (15,440 m)|
|AA Ceiling @ 80 degrees||34,800 feet (10,600 m)|
Suffren class [except Suffren and Dupleix] (8) and Emile Bertin (2): Model 1926
|Elevation||-5 / +80 degrees|
|Train||about +150 / -150 degrees|
1) These mountings had automatic rammers but they were apparently difficult to load at angles over 60 degrees, thus limiting their effectiveness as AA weapons.
2) The single and twin mountings on Emile Bertin all fed from a single magazine. This had a single hoist that could supply 20 rounds per minute, an inadequate supply for even two guns let alone the four that she carried. This hoist ended on the upper deck and the rounds had to be carried to the mountings by hand.
09 October 2006 - Benchmark
28 March 2012 - Added sketch
05 April 2013 - Replaced picture of Emile Bertin, added information about ammunition supply for Emile Bertin