This weapon is based upon the German Mauser MK 30 mm Model F gun and uses standard NATO ammunition. Effectively, this weapon is a scaled-down version of OTO-Breda's 40 mm/70 mounting. These mountings for these weapons are unmanned, gyro-stabilized and joystick controlled. The optical sighting system is line-of-sight stabilized with the aim-off automatically calculated while the target is kept in sight. OTO-Breda (later OTO-Melara and now Leonardo) claimed that this system is effective against surface targets at ranges up to 3,000 meters (3,300 yards).
OTO-Melara currently offers these weapons in either single or twin above deck mountings with local or remote control or in Compact-style mountings with below-deck magazine. These mountings are also shared with the 25 mm Compact.
Sea Cobra was a joint design between Marconi and OTO-Breda. This weapon was first tested in Britain at the Fraser Gunnery Range in the summer of 1988. The first operational installations were for the Italian Customs Service.
| Designation | Gun: 30 mm/82 (1.2") Mauser MK 30-1 Model F |
|---|---|
| Ship Class Used On | Coastal Patrol Boats |
| Date Of Design | 1984 |
| Date In Service | 1988 |
| Gun Weight | 340 lbs. (154 kg)
Barrel only: 132 lbs. (60 kg) |
| Gun Length oa | 131.9 in (335 cm) |
| Bore Length | about 97 in (246 cm) |
| Rifling Length | N/A |
| Grooves | N/A |
| Lands | N/A |
| Twist | N/A |
| Chamber Volume | N/A |
| Rate Of Fire | up to 800 rounds per minute per gun |
| Type | Fixed |
|---|---|
| Weight of Complete Round | HEI PGU-13: 1.50 lbs. (0.681 kg)
API PGU-14: 1.53 lbs. (0.694 kg) |
| Projectile Types and Weights | HEI PGU-13: 0.83 lbs. (0.378 kg)
API PGU-14: 0.60 lbs. (0.272 kg) |
| Bursting Charge | N/A |
| Projectile Length | N/A |
| Propellant Charge | 0.33 lbs. (0.150 kg) |
| Cartridge | 30 x 173 mm |
| Muzzle Velocity | HE: 3,410 fps (1,040 mps)
APDS: 4,000 fps (1,220 mps) |
| Working Pressure | 24.2 tons/in2 (3,800 kg/cm2) |
| Approximate Barrel Life | 5,000 rounds |
| Ammunition stowage per gun | Single Mountings: 160 ready rounds
Twin Mounting
|
| Distance | Time of Flight |
|---|---|
| 3,300 yards (3,000 m) | 5.36 seconds |
| Designation | Single 30 mm Compact Naval Mount 1: Mod 559, Mod 564, Mod 563
Twin 30 mm Compact Naval Mount 2: Type A, Type B Twin Sea Cobra |
|---|---|
| Weight | Without Ammunition
Mod 559: 3,307 lbs. (1,500 kg) Mod 564: 4,034 lbs. (1,830 kg) Mod 563: 4,167 to 4,365 lbs. (1,890 to 1,980 kg) Type A: 7,275 lbs. (3,300 kg) Type B: 7,055 lbs. (3,200 kg) Sea Cobra: N/A With Ammunition
|
| Elevation | Single Mountings: -15 / +75 degrees
Types A and B: -13 / +85 degrees Sea Cobra: -15 / +85 degrees |
| Elevation Rate | Single Mountings: 80 degrees per second
Types A and B: 75 degrees per second Sea Cobra: N/A |
| Train | 360 degrees |
| Train Rate | Single: 140 degrees per second
Types A and B: 130 degrees per second Sea Cobra: N/A |
| Gun recoil | N/A |
- ^Mod 559 is intended to be controlled only by an external FCS and/or by an emergency external aiming device (such as an Optical Director). Mod 564 has the external FCS supplemented by an electro-optic TV Micro Fire Control System (MFCS) which acts as a redundant system if the main FCS fails. The MFCS has an off-mount console equipped with a TV monitor and target indicators which can be remotely controlled from the ship's bridge. Mod 563 adds a manned on-mount control position with the operator utilizing the MFCS. This model is also available with a two axis stabilization of the line of fire.
- ^The difference between the Type A and Type B is simply in the number of ready-rounds on-mount. The Type A carries 2,000 rounds while the Type B carries 1,000 rounds.
"The Naval Institute Guide to World Naval Weapon Systems 1991/92" by Norman Friedman
"Defense & Armament Heracles International" Issue #69, January 1988
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ATK
OTO-Melara
Rheinmetall AG
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Special help by Matthew Rodchenko
21 May 2006 - Benchmark
19 April 2019 - Corrected typographical error, reorganized notes