People's Republic of China
100 mm/56 (3.9") ENG-2 or Type 79A
Updated 19 September 2008
An improved version of the 100 mm/56 (3.9") Type 79 and has replaced that weapon on new construction.  Uses a French-designed autoloader.

The mounting reportedly lacks safety interlocks and is considered dangerous to its crew.
WNPRC_39-56_ENG2_Zigong_pic.jpg

Chinese Frigate Zigong
Photograph copyrighted by Ships of the World
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Gun Characteristics
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Designation 100 mm/56 (3.9") ENG-2 or Type 79A
Ship Class Used On Jianghu II and III classes
Date Of Design N/A
Date In Service 1940
Gun Weight 2.424 tons (2.463 mt)
Gun Length oa 228.15 in (5.795 m)
Bore Length 210.63 in (5.350 m)
Rifling Length 182.09 in (4.625 m)
Grooves 40
Lands N/A
Twist N/A
Chamber Volume 487 in3 (7.98 dm3)
Rate Of Fire 25 rounds per minute
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Ammunition
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Type Fixed
Weight of Complete Round about 61.7 lbs. (28 kg)
Projectile Types and Weights AA grenade - 34.39 lbs. (15.6 kg)
AA (ZS-56) - 34.39 lbs. (15.6 kg)
AA (ZS-56P) - 35.05 lbs. (15.9 kg)
HE mod 1928 (F-56) - 34.83 lbs. (15.8 kg)
Diving - 33.07 lbs. (15.0 kg)
Star Shell (SB-56) - 35.27 lbs. (16.0 kg)
ECM (anti radar) (PB-56)
Bursting Charge AA grenade - 2.67 lbs. (1.21 kg)
AA (ZS-56) - 2.71 lbs. (1.23 kg)
AA (ZS-56P) - 1.74 lbs. (0.79 kg)
HE mod 1928 (F-56) - 2.76 lbs. (1.25 kg)
Diving - 6.28 lbs. (2.85 kg)
Star Shell (SB-56) - 0.03 lbs. (0.015 kg)
ECM (anti radar) (PB-56) - reflective material DOS-15
Projectile Length AA grenade - 5.3 calibers
AA (ZS-56) - 5.13 calibers
AA (ZS-56P) - 5.0 calibers
HE mod 1928 - 5.2 calibers
Diving - 5.04 calibers
Star Shell (SB-56) - 5.2 calibers
Propellant Charge 13.2 lbs. (6 kg)
Muzzle Velocity 3,004 fps (915 mps)
Working Pressure 19.1 tons/in2 (3,000 kg/cm2)
Approximate Barrel Life 800
Ammunition stowage per gun
(see Note)		 N/A
Note:  Twin mounts have 26 ready service rounds per gun.
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Range
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Elevation With 34.4 lbs. (15.6 kg) HE Shell
Maximum Range 24,600 yards (22,500 m) 
Elevation With 34.4 lbs. (15.6 kg) AA Shell
AA Ceiling 49,000 feet (15,000 m)
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Mount / Turret Data
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Designation Twin Mount Type 79A
Weight 34 tons (35 mt)
Elevation -5 / +85 degrees
Rate of Elevation 25 degrees per second (23 degrees per second2 acceleration)
Train +/ - 225 degrees (450 degrees total)
Rate of Train 20 degrees per second (20 degrees per second2 acceleration)
Gun Recoil N/A
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Data from
"The Naval Institute Guide to World Naval Weapon Systems 1997/98" by Norman Friedman