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design by Anttti Lahtinen
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
|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|
|150 Mj Laser Turret||10:1/10-31||20:1/10-31||40:1/10-31||80:1/10-31|