Since I've got the itch (& time!) to design again I thought I'd start with an odd idea that'd I'd been thinking of for a while - a Starfleet design with twin engineering hulls.
UDALOY CLASS
Class and Type: Udaloy-class Light Cruiser
Commissioning Date: 2359
HULL SYSTEMS
Size: 6
Length: 348 metres
Beam: 138 metres
Height: 79 metres
Decks: 20
Mass: 1332000 metric tonnes
SUs Available: 2220
SUs Used: 2054
Hull
Outer <24>
Inner <24>
Resistance
Outer: 8 <9>
Inner: 8 <9>
Structural Integrity Field
Main: Class 5 (Protection 80/120) <30>
[1 Power / 10 Protection / round]
Backup 1: Class 5 (Protection 40) <15>
[1 Power / 10 Protection / round]
Backup 2: Class 5 (Protection 40) <15>
[1 Power / 10 Protection / round]
PERSONNEL SYSTEMS
Crew/Passengers/Evac: 430/100/7000
Crew Quarters
Basic: 390 <39>
Expanded: 90 <18>
Luxury: 35 <35>
Unusual: 15 <15>
Environmental Systems
Basic Life Support [11 Power / round] <24>
Reserve Life Support [6 Power / round] <12>
Emergency Life Support (36 emergency shelters) <12>
Gravity [3 Power / round] <6>
Consumables: 3 year's worth <18>
Replication Systems
Food Replicators [6 Power / round] <6>
Industrial Replicator <12>
Type: Network of small replicators [2 Power / round]
Type: 1 Large unit [2 Power / round]
Medical Facilities: 9 (+2) [9 Power / round] <45>
EMH II [4 Power / round] <15>
Recreation Facilities: 8 [16 Power / round] <64>
Personnel Transport: Turbolifts, Jefferies tubes [2 Power / round] <18>
Fire Suppression System [1 Power / round when active] <6>
Cargo Holds: 300000 cubic metres <9>
Location: 10 main cargo holds and other minor holds throughout the ship
Escape Pods <8>
Number: 140
Capacity: 8 persons
PROPULSION SYSTEMS
Warp Drive
Nacelles: Type 6D <105>
Speed: 6.0/9.2/9.6 [1 Power / .2 warp speed]
PIS: Type H (12 hours of Maximum warp) <16>
Impulse Engine
Type: Class 5 (.7c/.9c) [7/9 Power / round] <25>
Location: Aft saucer
Reaction Control System (.025c) [2 Power / round when in use] <6>
POWER SYSTEMS
Warp Engine
Type: 2 Class 3/E (generate 190 Power / round / engine) <88>
Location: 1 per engineering hull
Impulse Engine: 1 Class 5 (generates 40 Power / round)
Auxiliary Power: 6 reactors (generates 30 Power / round) <18>
Emergency Power: Type D (generates 40 Power / round) <40>
EPS: Standard Power flow, +200 Power transfer / round <50>
Standard Usable Power: 420
OPERATIONS SYSTEMS
Bridge: Forward dorsal saucer <30>
Computers
Core 1: Saucer [5 Power / round] <12>
Core 2: Dorsal engineering hull [5 Power / round] <12>
Core 3: Ventral engineering hull [5 Power / round] <12>
Uprating: Class Beta (+2) [2 Power / computer / round] <12>
ODN <18>
Navigational Deflector [5 Power / round] <24>
Range: 10/20000/50000/150000
Accuracy: 5/6/8/11
Location: Forward ventral engineering hull
Sensor Systems
Long-range Sensors [5 Power / round] <48>
Range Rackage: Type 6 (Accuracy 3/4/7/10)
High Resolution: 5 LY (.5/.6-1.0/1.1-3.7/3.8-5.0)
Low Resolution: 16 LY (1/1.1-5.0/5.1-12.0/12.1-16)
Strength Package: Class 9 (Strength 9)
Gain Package: Class Beta (+2)
Coverage: Standard
Lateral Sensors [5 Power / round] <24>
Strength Package: Class 9 (Strength 9)
Gain Package: Class Beta (+2)
Coverage: Standard
Navigational Sensors [5 Power / round] <22>
Strength Package: Class 9 (Strength 9)
Gain Package: Class Beta (+2)
Probes: 140 probes of varying types <14>
Sensor Skills: 4
Flight Control Systems
Autopilot: Shipboard Systems (Flight Control) 3,
Coordination 2 [1 Power / round in use] <11>
Navigation Computer
Main: Class 3 (+2) [2 Power / round] <4>
Backups: 2 <2>
Inertial Damping Fields
Main <36>
Strength: 9 [3 Power / round]
Number: 3
Backup <9>
Strength: 6 [2 Power / round]
Number: 3
Attitude Control [2 Power / round] <2>
Communication Systems
Type: Class 9 [2 Power / round] <24>
Strength: 9
Security: -4
Basic Uprating: Class Beta (+2)
Emergency Communicatons: Yes [2 Power / round] <1>
Holocommunicatons: Yes <1>
Tractor Beams
Emitter: Class Delta [3 Power / Strength used / round] <12>
Accuracy: 4/5/7/10
Location: Forward dorsal
Emitter: Class Delta [3 Power / Strength used / round] <12>
Accuracy: 4/5/7/10
Location: Aft dorsal
Emitter: Class Delta [3 Power / Strength used / round] <12>
Accuracy: 4/5/7/10
Location: Forward ventral
Emitter: Class Delta [3 Power / Strength used / round] <12>
Accuracy: 4/5/7/10
Location: Aft ventral
Emitter: Class Alpha [3 Power / Strength used / round] <3>
Accuracy: 5/6/8/11
Location: Dorsal shuttlebay
Emitter: Class Alpha [3 Power / Strength used / round] <3>
Accuracy: 5/6/8/11
Location: Ventral shuttlebay
Transporters
Type: Personnel [5 Power / use] <72>
Pads: 6
Emitter/Receiver Array: Personnel Type 6 (40000 km range)
Energizing/Transition Coils: Class I (Strength 9)
Number and Location: (4) 2 Saucer and 1 per Engineering hull
Type: Emergency [7 Power / use] <72>
Pads: 22
Emitter/Receiver Array: Emergency Type 3 (15000 km range)
Energizing/Transition Coils: Class I (Strength 9)
Number and Location: (4) 2 Saucer and 1 per Engineering hull
Type: Cargo [4 Power / use] <39>
Pads: 400 kg
Emitter/Receiver Array: Cargo Type 3 (40000 km range)
Energizing/Transition Coils: Class H (Strength 8)
Number and Location: (3) 1 Saucer and 1 per Engineering hull
Security Systems
Rating 3 <12>
Anti-Intruder System: Yes [1 Power / round] <6>
Internal Force Fields [1 Power / 3 Strength] <6>
Science Systems
Rating 3 (+2) [3 Power / round] <21>
Specialised Systems: 3 <15>
Laboratories: 40 <8>
TACTICAL SYSTEMS
Forward Pulse Phaser Array <33>
Type: VIII Pulse
Damage: 210 [21 Power]
Number of Emitters: 160 (up to 4 shots per round)
Auto-Phaser Interlock: Gamma (Accuracy 3/4/6/9)
Range: 10/30000/100000/300000
Location: Forward dorsal engineering hull
Firing Arc: 180 degrees forward cone
Firing Modes: Standard, Wide-Beam
Dorsal Saucer Phaser Array <34>
Type: VIII
Damage: 160 [16 Power]
Number of Emitters: 160 (up to 4 shots per round)
Auto-Phaser Interlock: Beta (Accuracy 4/5/7/10)
Range: 10/30000/100000/300000
Location: Dorsal saucer
Firing Arc: 405 degrees dorsal
Firing Modes: Standard, Continuous, Pulse, Wide-Beam
Ventral Saucer Phaser Array <34>
Type: VIII
Damage: 160 [16 Power]
Number of Emitters: 160 (up to 4 shots per round)
Auto-Phaser Interlock: Beta (Accuracy 4/5/7/10)
Range: 10/30000/100000/300000
Location: Ventral saucer
Firing Arc: 405 degrees ventral
Firing Modes: Standard, Continuous, Pulse, Wide-Beam
Dorsal Engineering Hull Phaser Array <20>
Type: VIII
Damage: 160 [16 Power]
Number of Emitters: 80 (up to 2 shots per round)
Auto-Phaser Interlock: Beta (Accuracy 4/5/7/10)
Range: 10/30000/100000/300000
Location: Dorsalcing of the dorsal engineering hull
Firing Arc: 360 degrees dorsal
Firing Modes: Standard, Continuous, Pulse, Wide-Beam
Ventral Engineering Hull Phaser Array <20>
Type: VIII
Damage: 160 [16 Power]
Number of Emitters: 80 (up to 2 shots per round)
Auto-Phaser Interlock: Beta (Accuracy 4/5/7/10)
Range: 10/30000/100000/300000
Location: Ventral facing of the ventral engineering hull
Firing Arc: 360 degrees ventral
Firing Modes: Standard, Continuous, Pulse, Wide-Beam
Port Dorsal Phaser Array <11>
Type: VIII
Damage: 160 [16 Power]
Number of Emitters: 40 (up to 1 shots per round)
Auto-Phaser Interlock: Beta (Accuracy 4/5/7/10)
Range: 10/30000/100000/300000
Location: Port dorsal nacelle pylon
Firing Arc: 180 degrees port dorsal quarter
Firing Modes: Standard, Continuous, Pulse, Wide-Beam
Starboard Dorsal Phaser Array <11>
Type: VIII
Damage: 160 [16 Power]
Number of Emitters: 40 (up to 1 shots per round)
Auto-Phaser Interlock: Beta (Accuracy 4/5/7/10)
Range: 10/30000/100000/300000
Location: Starboard dorsal nacelle pylon
Firing Arc: 180 degrees starboard dorsal quarter
Firing Modes: Standard, Continuous, Pulse, Wide-Beam
Port Ventral Phaser Array <11>
Type: VIII
Damage: 160 [16 Power]
Number of Emitters: 40 (up to 1 shots per round)
Auto-Phaser Interlock: Beta (Accuracy 4/5/7/10)
Range: 10/30000/100000/300000
Location: Port ventral nacelle pylon
Firing Arc: 180 degrees port ventral quarter
Firing Modes: Standard, Continuous, Pulse, Wide-Beam
Starboard Ventral Phaser Array <11>
Type: VIII
Damage: 160 [16 Power]
Number of Emitters: 40 (up to 1 shots per round)
Auto-Phaser Interlock: Beta (Accuracy 4/5/7/10)
Range: 10/30000/100000/300000
Location: Starboard ventral nacelle pylon
Firing Arc: 180 degrees starboard ventral quarter
Firing Modes: Standard, Continuous, Pulse, Wide-Beam
Forward Dorsal Advanced Torpedo Launcher <21>
Standard Load: Type II photon torpedo (200 Damage)
Spread: 4
Range: 15/350000/1500000/4050000
Targeting System: Beta (Accuracy 4/5/7/10)
Power: [20 + 5 per torpedo fired]
Location: Forward dorsal engineering hull
Firing Arc: Forward, but are self-guided
Forward Ventral Torpedo Launcher <14>
Standard Load: Type II photon torpedo (200 Damage)
Spread: 4
Range: 15/350000/1500000/4050000
Targeting System: Beta (Accuracy 4/5/7/10)
Power: [20 + 5 per torpedo fired]
Location: Ventral saucer
Firing Arc: Forward, but are self-guided
Aft Torpedo Launcher <14>
Standard Load: Type II photon torpedo (200 Damage)
Spread: 4
Range: 15/350000/1500000/4050000
Targeting System: Beta (Accuracy 4/5/7/10)
Power: [20 + 5 per torpedo fired]
Location: Aft dorsal engineering hull
Firing Arc: Aft, but are self-guided
Torpedoes Carried: 180 <18> - 160 Type II & 20 Type X
TA/T/TS: Class Beta [1 Power / round] <9>
Strength: 8
Bonus: +1
Weapons Skill: 4
Shields (Forward,Aft, Port,Starboard) <55 x 4>
Shield Generator: Class 3 (Protection 600)
[60 Power / shield / round]
Shield Grid: Type C (50% increase to 900 Protection)
Subspace Field Distortion Amplifiers: Class Delta (Threshold 200)
Recharging System: Class 2 (40 seconds)
Advanced Shield Capabilities: Multi-Spectral
Backup Shield Generators: 4 (1 per shield) <8>
Auto-Destruct System <6>
AUXILLIARY SPACECRAFT SYSTEMS
Shuttlebays: Capacity for 40 Size worth of ships <80>
Standard Complement: 16 shuttles, 8 shuttlepods
Locations: 2 main shuttlebays, aft engineering hulls
Captain's Yacht: Yes <10>
DESCRIPTION AND NOTES
The Udaloy-class Light Cruiser was introduced three years after the Galaxy-class Explorer and borrowed many features from Starfleet's flagship design. The Udaloy is extremely unusual in that it's one of the few vessels produced by Starfleet with twin engineering hulls, each fitted with it's own small warp core instead of a single large core as standard. Appearance-wise the Udaloy-class is simply a scaled-down Galaxy with a second, near-identical engineering hull mounted dorsally in a mirror-image to the usual ventrally mounted secondary hull. Closer examination shows that there are slight differences between the two hulls: only the ventral hull has a deflector dish, on the dorsal hull this is replaced by a pulse phaser array mounted in a quad barrel configuraion, around a heavy torpedo launcher; in addition the shuttlebay at the rear of the dorsal hull follows the same orientation as it's ventral counterpart instead of being a direct mirror. The two warp nacelles are connected to both the engineering hulls by identical curved pylons so that from the front or rear the design has an oval outline.
The Udaloy-class was designed as a general purpose Light Cruiser and was given a wide-range of equipment enabling it to perform nearly any role required by Starfleet, if not quite as well as more dedicated designs. The desire to fulfil as many different functions within a single design is what lead to the extra secondary hull as volume requirements increased. Due to it's large, well equiped shuttlebays, a common configuration when used in a combat mission was as a carrier for the early versions of what eventually became the current Starfleet Attack Fighter, although Andorian Defence Force fighters were just as frequently carried.
Recently the class has undergone an upgrade to improve and overhaul a number of systems. The already extensive medical facilities have been boosted with the addition of an advanced shipwide EMH capability, which also allowed the fitting of holocommunications. Weaponry was left untouched since the design is no longer intended for a combat role, although shielding was strengthened and upgraded with multi-spectral generators. Modern automation techniques actually reduced the number of crew required to operate and maintain the ship with the excess quarters now taken up by extra scientific personnel and passengers.
DEVELOPER'S NOTES
Note that there is only a single pulse phaser array even though their are 4 individual cannon, as SD says they're only usually built with paired cannon.