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Mureena II Class System Defense Boat

design by Anttti Lahtinen

Mureena II-Class ("Mureena" is "Moray Eeel" in Anglic) was a pre- collapse export version of the Vyborgian Mureena SDB. Mureena-class was designed to be a long-range Laser/Missile platform, with adequate sensors, thrust and fuel endurance. Additional design requirement was the ability to lay low in atmosphere and underwater.

Because of the stealth requirements, the Mureena is shaped like a submarine: the hull is cylinder (5:1 L/W ratio) with rounded ends, and has elevated "conn tower" on top deck. The conn tower is shaped so that underwater Mureena can push the tower through thick ice while the rest of the ship remains underwater.

The ship has unusual auxiliary ducted fan thruster (twin rim-drive tunnel propellers), which generate 1 MN thrust in standard atmosphere (much more in water). These fans allow slow underwater and atmospheric manoeuvering (640 km/h) without using the highly visible HEPlaR thruster.

The main differences between Mureena I and II is that the M2 equipped with Imperial TL-15 weapons, meson screen and fuel purifier. The M1's original High-Automation control systems are also re-engineered into Imperial low-automation standards, so the M2 requires a crew of 54 (+10 Mariners) instead of original 22 (+30 Jaegers).

Exported Mureena II SDBs were equipped with standard imperial socket weapons: 150 MJ tunable laser turrets, 50 cannister sandcasters and standard missile barbettes with 5 missiles each.

The original Mureena I SDBs were equipped with Solomani socket weapons: 144 MJ x-ray laser turrets, 40 cannister sandcasters and either guided "SS-N-31 Sparte", semi-independent "SS-N-33 Swarm" or "SS-N-34 Scramasax (AHEAD KKM)" missile barbettes.

Aurora Boriolis uses the same hull/sensor/socket suite for Mureena-class SDBs and Barracuda-class patrol cruisers.

The ship has many power-hungry components, but many of them are redundant and are likely to be turned off during combat. For example, it is highly unlikely that main thruster, auxiliary thruster and CG lifter would have to be operating at full power level simultaneously.

The sip is build in a world with Technology Profile: EE-EFFFF-EEEG-EE-G, so the only key component that had to be imported is the TL-15 Power Plant. (The 4.5 GW plant is a stock item manufactured in Aquitaine for Saxe Transport's Palfrey-class freight tug).

The HEPlaR thruster provides slightly more than 6G acceleration. This allows the ship to have full 6G acceleration even if all turret were fitted with heavier lasers.

Auxiliary Ducted fan provides 1000 kN thrust, and is used for low-speed maneuvering in atmosphere/hydrosphere. (Ref Surf = 172.2 m2, Drag Coeff = 0.3, Air Density 1.225 kg/m3, Thrust = 1 MN => Max Airspeed = 177.8 m/s = 640 km/h) (Ref Surf = 172.2 m2, Drag Coeff = 0.3, Water Density 1000 kg/m3, Propeller power = 40 MW => Max submerged speed = 11.6 m/s = 42 km/h)

Crew formulas did not require a sickbay, but it was included since the ship was intended for long-duration patrols.

Conn tower contains laser turret, 4-hex fixed PEMS, MFD sensors and 2 air locks.

Mureena Class System Defense Boat

General Data

Displacement: 850 tons Hull Armor: 300
Length: 74.04 meters Volume: 11900 m3
Price: 549.4 MCr Target Size: S
Configuration: SL Cylinder Tech Level: 14/15
Mass (Loaded/Unloaded): 9991.3 / 9382.3

Engineering Data

Power Plant: 4500 MW Fusion Power Plant, 1 year duration (450 m3 fuel)
Jump Performance: None
Jump Fuel: 0 m3
G-Rating: 6G HEPlaR (500 MW/G), Auxiliary Ducted Fan (0.01G, 40 MW), High-Efficiency CG Lifter (85 MW)
G-Turns: 100, 62.5 m3 fuel each
Maint: 183


Computer: 3xTL-15 Fibre-optic computer (1.1 MW)
Commo: 2xMaser (Unlimited; 0.6 MW), Radio (10 hex; 10 MW)
Avionics: Imaging EMS, IGS positioning, 180 km/h NOE
Sensors: AEMS (16 hex; 25 MW), PEMS Folding array (8 hex; 0.3 MW), PEMS Fixed array (4 hex; 0.1 MW)
Controls: Bridge with 15 bridge workstations, 31 normal workstations


Offensive 6xTL-15 150-MJ Laser Turret (Loc:?-Arcs:?;333.333 MW;0 Crew), 3xMissile Barbette (0.15 MW; 1 crew)
Defensive: Meson Screen Generator (PV=500; 39.1 MW; 1 Crew), 3xSand Turret (1 MW; 1 crew)
Master Fire Directors: 3xTL-15 (6 Diff Mods; 10 hex; Msl 10 hex; 1.86 MW; 1 crew)

150 Mj Laser Turret10:1/10-3120:1/10-31 40:1/10-31 80:1/10-31


Life Support: Extended (0.9652 MW)
Gravitic Compensation: 6Gs (8.855 MW)
Crew: 64 (4xManeuver, 1xElectronics, 31xEngineer, 10xGunnery, 10xShip's Troops, 1xSteward, 7xCommand)
Crew Accommodations: 36xSmall Stateroom (0.5 kW)
Passenger Accomadation: None
Other Facilities: Electronics Shop (0.6 MW), Sick Bay (0.8 MW)
Cargo: 140 m3 1 SmallCargo Hatch
Small Craft and Launch Facilities: None
Air Locks: 8


Total Fuel Tankage: 6700 m3 (478.6 tons)
Fuel scoops (10% of ship surface), fills tanks in 1.41 hours
Fuel purification machinery (1MW), 201 hours to refine 6700 m3.
683.1 MW power shortfall.

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