This gun was designed specifically for the Chapaev class (Pr.68) cruisers. Manufactured between 1948 and 1955 with a total of 150 weapons being built for the five Chapaev class and twenty Sverdlov class (Pr.68bis) cruisers.
These guns were controlled by the "Zenit-68bis A" Fire Control System which was used to control both these guns and the smaller AA guns. This system included a "Yakor'" radar and a SPN-500 radar system. The final targeting data was given by TsAS-1 and PKU-1 control systems. Any 100 mm (3.9") turret could provide firing data should the central computer be knocked out.
The mounting was cross-level stabilized up to -20/+20 degrees of roll using a Jenny-type coupling which was automatically controlled from a central location using the remote control system D-5S. In 1949 a BL-127 quadruple mount was designed, but this was not approved for production.
Constructed of loose liner, casing, barrel nut and a support ring. Used a sliding breech block with spring automatics. The guns were not individually sleeved.
| Designation | 100 mm/70 (3.9") CM-5 |
|---|---|
| Ship Class Used On | Chapaev and Sverdlov classes |
| Date Of Design | 1947 |
| Date In Service | 1949 |
| Gun Weight | 3.91 tons (3.972 kg) |
| Gun Length oa | 276.18 in (7.015 m) |
| Bore Length | 261.22 in (6.635 m) |
| Rifling Length | 227.4 in (5.776 m) |
| Grooves | 32 |
| Lands | N/A |
| Twist | N/A |
| Chamber Volume | 640.7 in3 (10.5 dm3) |
| Rate Of Fire | CM-5-1: 15 - 18 rounds per minute BL-127: 16 - 18 rounds per minute |
| Type | Fixed |
|---|---|
| Weight of Complete Round | N/A |
| Projectile Types and Weights | HE (F-55): 34.39 lbs. (15.6 kg) FRAG (OF-55): 34.39 lbs. (15.6 kg) AA (ZS-55): 34.39 lbs. (15.6 kg) AA (ZS-55P): 35.05 lbs. (15.9 kg) Star Shell (SB-55): 32.67 lbs. (14.82 kg) ECM (anti-radar) (PB-55): 39.19 lbs. (14.6 kg) |
| Bursting Charge | HE (F-55): 2.47 lbs. (1.12 kg) FRAG (OF-55): 2.78 lbs. (1.26 kg) AA (ZS-55): 2.95 lbs. (1.34 kg) AA (ZS-55P): 19.44 lbs. (8.816 kg) Star Shell (SB-55): 0.086 lbs. (0.039 kg) |
| Projectile Length | N/A |
| Propellant Charge | Full (ZhB-55PB): 15.87 lbs. (7.2 kg) Reduced (AUM-55PB): 8.6 lbs. (3.9 kg) Special (ACB-55PB): 9.04 lbs. (4.1 kg) |
| Muzzle Velocity | FRAG (OF-55): 3,281 fps (1,000 mps) AA (ZS-55): 3,281 fps (1,000 mps) AA (ZS-55P): 3,264 fps (995 mps) Star Shell (SB-55): 2,559 fps (780 mps) ECM (anti-radar) (PB-55): 2,575 fps (785 mps) |
| Working Pressure | Full (ZhB-55PB): 22.8 tons/in2 (3,600 kg/cm2) Reduced (AUM-55PB): 12 tons/in2 (1,900 kg/cm2) Special (ACB-55PB): 14.6 tons/in2 (2,300 kg/cm2) |
| Approximate Barrel Life | N/A |
| Ammunition stowage per gun | 320 rounds |
| Elevation | Distance |
|---|---|
| 49 degrees | 26,460 yards (24,200 m) |
| Elevation | Distance |
|---|---|
| 30 degrees (Max. Range using Time fuze) |
23,400 yards (21,400 m) |
| Max. Effective ceiling | 52,490 feet (16,000 m ) |
| Max. Ballistic ceiling | 65,620 feet (20,000 m) |
| Designation |
|
|---|---|
| Weight | CM-5-1: 45 tons (45.8 mt) BL-127: 65 tons (66 mt) |
| Elevation | CM-5-1: -8 / +85 degrees BL-127: -5 / +85 degrees |
| Rate of Elevation | CM-5-1: 16 degrees per second BL-127: 20 degrees per second |
| Train | CM-5-1: -200/+200 degrees BL-127: 320 degrees |
| Rate of Train | CM-5-1: 17 degrees per second BL-127: 30 degrees per second |
| Gun Recoil | CM-5-1 @ 0 degrees: 19.6 in (49 cm) CM-5-1 @ 85 degrees: 22.8 in (58 cm) |
Data from:
- "Jane's Pocket Book 9: Naval Armament" edited by Denis Archer
- "Entsiklopedia Otechestvennoi Artillerii" (Encyclopedia of Fatherland (Russian) Artillery) by A.V. Shirokorad
Special help from Vladimir Yakubov
- 18 November 2006
- Benchmark
- 19 March 2016
- Corrected typographical