Specification Review: Duke Cornwall-class Medium (Support) Battlecruiser

Posted March 19, 2021, 2:49 p.m. by Captain Nicholas Villarreal (Engineering Director) (Nicholas Villarreal)

Interestingly enough, we get not one but two battlecruiser specification submissions to consider. This one comes to us from Robert Archer.

This design is specifically for NPC use, so please bear that in mind. All comments must be related to the specification itself in some sense, and must be impersonal in nature regarding its designer.

The Duke Cornwall-class Medium (Support) Battlecruiser is under review until April 2, 2021.

Nicholas Villarreal
Engineering Director

Duke Cornwall-Class
Category: Battlecruiser
Variant: Medium (Support)
Designer: Robert Archer
Mark I
Draft 1
Date: 19 March 2021


In 2367 in the aftermath of the Battle of Wolf 359 many in Starfleet’s core building firms saw the need to up gun Starfleet’s rebuilding efforts with heavier armed ships to counter a future Borg or other threatening force incursion to the Federation. To this effort came classes like the Defiant, as well as numerous other refits and redesigns of aging and proven classes currently in the Fleet inventory.

One such new design which came to fruition in limited numbers was the Duke Cornwall class medium battlecruiser. Meant as a fast, heavy armed interceptor like ship. As well as a command and control ship for fleet engagements, troop and high security transports, and combat, it was well suited for its envisioned profile. As 2368 dawned, the Duke Cornwall class entered production from the shipyards around Andoria, soon gaining the class motto of ‘Put up your Dukes’ by the crews who served on them due to the robustness of its construction and firepower for the time.

Mission Profiles

The Duke Cornwall class is suited to the following mission profiles:

Troop and high security transport
Frontline and combat support roles
Cargo and supply transport
System and border patrols


The Duke Cornwall class is made up of a classic two piece circular saucer connected by a narrow short stubbed neck to a filled in U shaped secondary hull. Projecting downward on short static pylons, to port and starboard, are the ship’s two conical shaped nacelles.

The ship’s superstructure is made of duranium metals with a triple hull layer measuring 3.0 centimeters thick. Layered between each layer are combat energized duranium paddings. Layered atop the final outer hull layer was 8.0 centimeters of Rodium armor plating. The entire height of the Duke Cornwall spans 12 decks, with decks 1-5 encompassing the saucer and 6-12 encompassing the short connecting neck and engineering hull.


Sensor Systems

The Duke Cornwall class makes use of the Type-VII sensor system. Made up of numerous grouped palettes about the edge lines of the saucer and secondary hull, the system has a low resolution scan of 3.72 light years and a high resolution scan of 11 light years. Arranged in an oval shaped inset on decks 11 and 12 is the ship’s main deflector dish.

Computer Core / OS / Network systems

The Duke Cornwall class makes use of a single isolinear data storage computer core and network. The core is positioned on the forward areas of decks 11 and 12 behind the ship’s main deflector dish. It runs on the LCARS 5.0 operating system with MAJEL interface.

Warp Propulsion Systems

The Duke Cornwall due in part to its need for speed to intercept incoming enemy forces was equipped with the Class-8 warp core. The core has a Cochrane rating of 1,909+, a cruising speed of warp 6, a max sustainable speed of warp 9.2, a max velocity speed for 12 hours of warp 9.6 and an emergency speed of warp 9.8 for 3 hours.

Impulse Propulsion Systems

The Duke Cornwall has a single impulse engine situated on the aft center areas of the saucer on decks 2 and 3. With this combat ready engine, the Duke Cornwall can reach a full impulse speed of .30c in 40 seconds and a full stop in that same time.


Defensive Shields

The Duke Cornwall makes use of the Type-10 Shield array system. The system has a maximum graviton load of 2,150 MW and a maximum dissipation rate of 5.84 x 10^5 KW. The system also has metaphasic programming for protection against solar radiation, solar body entry, or other similar anomalies.

Phaser Systems

The Duke Cornwall carries ten Type-IX phaser arrays. They are positioned as follows:

One array dorsal and ventral on the saucer, shaped as a half circle with 100 emitters each.
Two arrays port and starboard, dorsal and ventral, mounted on the nacelle pylons with 25 emitters each.
One array port and starboard dorsal and ventral on the forward and aft edges of the saucer and engineering hull with 25 emitters each.

Each array is capable of a max energy output of 3.8 MW to a maximum effective range of 225,000 km.

Torpedo Systems

The Duke Cornwall class carries four Type-4 burst fire torpedo launchers. The burst fire launchers are mounted with 3 forward and 1 aft, within the connecting neck of the engineering hull on decks 7 and 8. The burst fire system can fire 5 torpedoes/probes every 10 seconds, out to a range of 3,500,000 kilometers.

The Duke Cornwall carries 300 casings divided as follows:

270 standard photon torpedoes
30 assorted scientific probes



The bridge of the Duke Cornwall class is set up on deck 1 of the ship. It is arranged in a half circle shape. The CO’s chair is at the center of the bridge, to port of them is the XO, to starboard is the CNS. Forward of the CO are the combined Helm, and Navigator stations. Aft of the CO from starboard to port are the CE, CSO, COS, CTO and two Aux stations as mission and personnel needs arise. Forward of the combined Helm and Navigator station is the main view screen. Entry to the bridge is gained by a single turbolift, to the port side of the main view screen.

Ready Room

The ship’s ready room houses a single L shaped desk, two shelves and a small area for personal furnishings and effects. A single replicator along the port wall is located here. Entrance is gained from the bridge to the forward port side of the bridge next to the turbolift.

Conference Room

The briefing room houses a single straight oaken table capable of seating six individuals at any given time. A single briefing screen is located along the aft starboard wall of the room. Entrance is gained at the aft starboard side of the bridge.

Security Office / COS’s Office / Armory

The Duke Cornwall’s COS office is located on deck 5 starboard of the brig, the armory is located on deck 6 also to starboard directly below the brig.

The armory holds the following standard weapons:

175 Type-II phasers
50 Type-III phaser rifles

These weapons can only be accessed by the CO/XO/COS and assigned security officers during normal operations.

Brig Cells

The Duke Cornwall houses four, four-person brig cells on deck 5 to port.

Marine Company Complex

Similar to the refit in 2360 of the aging Chandley class heavy cruiser, the Duke Cornwall was provided with the means to carry up to 50 marine personnel for boarding actions. As such, this complex is set up on deck 6 port down the hall from the ship’s armory; this area carries special supplies and storage for the ship’s marines, as well as training equipment.

Science Labs / Chief Science Officer’s Office

Arranged in a square cluster in the connecting neck on deck 9 are Duke Cornwall’s 2 General Purpose Science Labs. The office of the ship’s CSO is located on this deck connected to the first General Science lab.

Main Engineering / Chief Engineer’s Office

The main engineering complex and its support systems are arranged along the aft central areas of decks 11 and 12. The primary control area of main engineering is located on decks 11 and 12. This area is arranged in a serviceable rectangle-shaped room with access points in the middle areas with turbolifts for each deck and service ladders. In an emergency this area can be converted into an auxiliary bridge.


Cargo Bays

The Duke Cornwall class has two large, two-deck cargo bays on Decks 10 and 11, one to port and one to starboard. Access doors allow docking of ships when required, and each bay has a single cargo transporter. Two smaller, single-deck cargo bays are located adjacent to each large bay to provide additional storage for prolonged missions.

Tractor Beam Systems

The Duke Cornwall class is equipped with a single tractor beam on the external aft part of deck 12. It can tractor a variable load out to 30,000 km.

Transporter Systems

The Duke Cornwall carries four, six-person transporter rooms with two on decks 7 and 8 to port and starboard, and the other two on decks 11 and 12 to port and starboard. The class contains three twelve-person emergency transporters which are situated on deck 4 starboard, 8 port, and 12 starboard.

The six-person transporters have a max range of 40,000 km, and the twelve-person transporters have an outgoing only range of 15,000 km.

Turbolift Systems

The Duke Cornwall uses a standard turbolift system, delivering crew to various central hub locations throughout the ship. A service area for the system is located on deck 11.



The Duke Cornwall’s sickbay complex is located on deck 5 to starboard. It contains a comprehensive suite consisting of 7 bio-beds, 2 two person surgery suites with two surgery beds, two three patient sized isolation rooms, and a morgue facility capable of holding up to 30 bodies in stasis. The CMO’s office is connected to the main sick bay area.

Counseling Offices

The counseling office for the Duke Cornwall class is located on deck 5 down the hall from sickbay. A single private office is set up for the use of the crew’s mental health needs.


The Duke Cornwall carries two holodecks, holodecks 1 and 2 are on deck 4 port and starboard.


The main crew lounge and mess area is located at the forward end of the ship on deck 5. The lounge carries two full service replicators, a small prep and storage kitchen and various seating for up to 20 people at any given time.

CO Quarters

The CO’s quarters are located on deck 2 port, this large three section room has a spacious living/work area with two couches, three chairs, and a meal table with replicator. The bedroom and bathroom combined area holds a King sized bed and a sonic shower and traditional bath tub suite with sink. The third area is a private CO accessed only storage area for personal effects, access is gained only from inside the CO’s quarters.

XO Quarters

The XO’s quarters are located on deck 2 starboard; it is arranged much like the CO quarters; however, the storage area is half the size of the CO’s and is combined with the bedroom and bathroom suite.

Department Head Quarters

All department head quarters are located in a ring around deck 3; they are divided into two areas, a work/living area with one couch, table, and two chairs and a replicator. The second is a bathroom/bedroom suite; however, unlike the CO/XO’s quarters the department heads only have a stand up sonic shower stall and sink, and the bed is Queen sized.

Junior Officer

The JO quarters are located in the forward half of decks 4, 5, 8, 9, 10, 11, 12; they are set up the same as the department head quarters however just half their size, the bed is full twin-sized in nature as well. The living/work area holds a single two person couch, and two lounge chairs with a replicator and three-person table.

Non-com Officer Quarters

The non-com crew quarters are located in the aft half areas of decks 4, 5, 8, 9, 10, 11, 12, they are set up the same as the JO quarters in size but the living/work area has only three chairs, a three person table, and a replicator.

VIP Quarters

Six VIP Quarters setup the same as the XO’s quarters in scope are arranged on deck 3 aft of the department head quarters.

General Guest Quarters

Ten General Guest Quarters setup like the JO quarters are arranged on deck 4 forward.

Marine Officer Quarters

Four marine officer quarters setup like the department head quarters are arranged on deck 6.

Marine Non-com quarters

Forty-six marine non-com quarters are set up like the JO quarters in a ring on deck 6.


Shuttle Bay

The Duke Cornwall carries two shuttle bays, setup to port and starboard on decks 7 and 8 within the connecting neck structure. The ship carries 2 Type-6 shuttles in bay 1 to port, and 1 Danube class runabout with weapons pod standard to starboard in bay 2. Each bay can also retrieve a single runabout or shuttle sized craft if needed. Service and maintenance areas are set up to port and starboard respectively for each bay with their own overseeing connected launch control suite.


Dimensions and Structure

Length: 175 meters
Beam (Width): 65 meters
Height: 58 meters
Decks: 12

Crew Complement

Officers and Crew: 175
Visiting Personnel: 10-16
Maximum Evacuation Limit: 800

Computer Systems

Bio-neural data / isolinear storage computer core

Software: LCARS 5.0 running MAJEL interface

Warp Systems

Power Plant
One 1909+ cochrane M/ARA cores feeding two nacelles
Cruising Velocity
Warp 6.0
Maximum Sustainable Velocity
Warp 9.2
Maximum Velocity
Warp 9.6 (12 hours)
Emergency Speed
Warp 9.8 (3 hours)

Impulse Systems

Full Impulse
50 seconds
50 seconds
Defensive Systems

Shield Maximum Graviton Load (Continuous): 2,150 MegaWatts
Shield Maximum Energy Dissipation Rate: 5.84x10^5 kilowatts

Offensive Systems


Torpedo Tubes: Type-4, 3 forward 1 aft

Standard Payload (total)
270 photon torpedoes
Scientific Payload (total)
30 assorted probes

Phasers: 10 Type-IX Phaser Arrays

Deck Layout

Deck 1
Main Bridge
Ready Room
Briefing Room

Deck 2
CO Quarters
XO Quarters
Upper impulse engines
Upper Deuterium Storage tanks 1 and 2
Deuterium refueling hatch

Deck 3
DH Quarters
VIP Quarters
Lower Impulse engines
Lower Deuterium Storage tanks 1 and 2
Emergency deuterium storage tanks ejection systems

Deck 4
JO Quarters
Non-com Quarters
General Guest Quarters
Emergency Transporter Room 1
Holodeck 1 and 2

Deck 5
JO Quarters
Non-com Quarters
COS Office
Holodeck 3
Counselor’s Office

Deck 6
Marine Company Complex
Marine Complex Storage Area
Marine Officer’s Quarters
Marine Noncom Quarters

Deck 7
Upper Shuttlebay 1 and 2
Standard Transporter Room 1
Upper Torpedo/Probe Launcher 1-4
Upper Torpedo/Probe Storage Room

Deck 8
Lower Shuttlebay 1 and 2
JO Quarters
Non-com Quarters
Standard Transporter Room 2
Emergency Transporter Room 2
Lower Torpedo/Probe Storage Room

Deck 9
JO Quarters
Non-com Quarters
CSO’s Office
General Science Lab 1 and 2

Deck 10
JO Quarters
Non-com Quarters
Upper Large Cargo Bay 1 and 2
Small Cargo Bay 1 and 2

Deck 11
JO Quarters
Non-com Quarters
Turbolift Service Area
Standard Transporter Room 3
Lower Large Cargo Bay 1 and 2
Upper Engineering Room
CE’s Office
Upper Deflector Dish
Upper Deflector Dish Control Room
Upper Computer Core
Upper Computer Core Control Room
Upper Warp Core
Upper Matter/Antimatter Pod Storage

Deck 12
JO Quarters
Non-com Quarters
Standard Transporter Room 4
Emergency Transporter Room 3
Tractor Beam Emitter
Lower Deflector Dish
Lower Deflector Dish Control Room
Lower Computer Core
Lower Computer Core Control Room
Lower Engineering Room
Lower Warp Core
Lower Matter/Antimatter Pod Storage
Warp Core/Matter/Antimatter Pod Ejection Systems

Ships Of The Class

Ships of the Duke Cornwall class are named after dukedoms on Earth within the United Kingdom from the 1300s to the mid 1600s. These ships are NPC status and may be reused by gamemasters as needed.

USS Duke Cornwall NCC-8500
USS Duke Rothesay NCC-8501
USS Duke Norfolk NCC-8502
USS Duke Somerset NCC-8503
USS Duke Hamilton NCC-8504


Though only five of these small nimble battle cruisers have been built, plans are in place should the need arise for additional construction in emergencies. Fast, heavy armored and armed for their time. The Duke Cornwall class battlecruisers are envisioned to become a staple in future Federation defense in the years to come.

SUBMITTED 19 March 2021
Robert Archer

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