British Royal Navy Yarmouth Castle class Combat Supply Ship:
Like the United States Navy, the British Navy converted all of their vessels from conventional fuels to nuclear power during the second half of the Twenty-First Century. This meant that supply vessels would no longer need to carry fuel and in reality it was not desirable that they carry fuel. More stores could be carried and one area of fire hazard could be reduced. The expense of completely gutting a supply ship and rebuilding it would cost as much as constructing a completely new vessel. Instead, the British decided to construct a whole new vessel. A new vessel would also have the advantage of a much longer operating life. It is similar to United States supply vessels that were constructed at the same time but has many important differences. One of the most important differences is that while the United States built about twenty vessels of their new class, the British Navy only needed six vessels. Basically, the idea was to be able to deploy one or two with each carrier group and have a couple to perform in other theaters.
The British Navy considered the United States Yosemite class to be monsters in most respects and the Yarmouth Castle class is quite a bit smaller. The Yarmouth Castle was laid down about three years after the Yosemite was commissioned and the British were able to make some observations of the American design before completing their design. They still carry a respectable load of cargo and are better armed for defense than the United States Vessels. This was partially done by using a far less powerful propulsion plant. Even so, the Yarmouth Castle class can do a respectable 26 knots on its two fusion reactors.
As the Yarmouth Castle class were new construction vessels, they were constructed from the beginning out of high strength composites and alloys that were far stronger than steel. Unlike many combat vessels, the Yarmouth castle uses a conventional hull. Their hulls and superstructure were designed to give the vessels as much stealth as possible although cargo equipment reduces the stealth quite a bit and retractable equipment was considered too cumbersome. For self defense, the ships are outfitted with one tactical length Mk 41 VLS and four point defense mounts with a rail gun and short range missile launcher in one mount. Originally, Sea Ram launchers were planned. The ship also carries four 30 mm machine-guns but were rarely used due to having no advanced fire control. Most systems on the ships are similar to other vessels of the British Navy but are less extensive due to the vessels not designed to truly go into harms way.
Maximum cargo load is 6,000 tons of ammunition, 10,000 tons of dry stores, and 1200 tons of refrigerated cargo. All cargo holds are environmentally controlled to extend the life of the cargo. Heat can do damage to Ammunition and makes it more likely for an ammunition fire to start. On either side of the vessel are four replenishment derricks along with the ship carrying a centrally mounted cargo crane. Like the United States Navy, British Navy considered it too difficult to load Vertical Launch Systems with any missile larger than a medium range missile while underway but the ship was designed to be able to reload the missile launchers with larger missiles such as cruise and long range missiles when the two ships were tied together at a pier or at anchor. Cruise missiles and long range missiles can only be loaded into launchers while the vessel being loaded is tied alongside the supply vessel either at anchor or pier side. All other replenishment including loading medium range missiles in the missile launchers could be done underway in up to moderate seas. Cargo transfer is done by helicopter in addition to using cargo derricks.
One of the vessels, the HMS Dartmouth Castle was part of the Ark Royal task force when the task force was attacked by Argentinian stealth bombers equipped with nuclear weapons. The Dartmouth Castle was believed to have been destroyed with the rest of the task force. The reality is that all of the nuclear weapons that would have hit the task force were destroyed but several nuclear warheads exploded prematurely. These activated the South American Triangle and Rifted the vessels far into the future.
Model Type: A-620 Yarmouth Castle Class Combat Supply Ship
Vehicle Type: Ocean, Auxiliary (Stores / Ammunition Vessel)
Crew: 218 (16 officers, 16 chief petty officers, 186 enlisted [Has a high degree of automation])
Troops: 8 Merlin Crew members, 8 Power Armor Pilots (Flight capable Semper Fi Power Armors), and up to 20 troops for protection of special cargo.
Robots, Power Armors, and Vehicles:
|8||Gypsy Moth Power Armors (With Flight Pack)|
|2||Westland Merlin HM 1 helicopters|
M.D.C. by Location:
| Rear Flight Deck||500|
| Main Bridge / Superstructure:||800|
| Marconi/Signaal S1650M Air/Surf. Search Radar:||300|
|Cargo / Ammo Gantries (8, 4 on each side)||120 each|
|Cargo / Missile Crane (1, center)||400|
|MK-41 Tactical length 16 cell VLS (Bow):||100 each|
|Mk 44 Combination Anti-Missile Defense System (4, Sides):||200 each|
|30 mm cannon (4):||50 each|
|Chaff Launchers (4, Superstructure):||10 each|
| Main Body:||5,000|
 If the flight deck is destroyed, no aircraft can be launched or land.
 If Bridge / Superstructure is destroyed, the ship can still be piloted from engineering but with a -15% to piloting rolls. Communication and sensor equipment are not concentrated on the bridge to reduce the effectiveness of bridge hits.
 Destroying the S1650M Air/Surf. Search Radar will destroy the ship’s main fire control systems but the vessel has backup systems with a shorter range (Equal to robot vehicle sensors)
 Destroying the main body causes the ship to lose structural integrity, causing the ship to sink. There are enough life preservers and inflatable life boats to accommodate everyone on the ship.
Surface: 29.9 mph (26 knots/ 48.1 kph)
Maximum Effective Range: Unlimited due to fusion engines (needs to refuel every 20 years and requires maintenance as well). Ship normally carries years months of supplies on board (Most goes to other vessels it is resupplying)
Length: 682.4 feet (208.5 meters)
Draft: 33.5 feet (10.2 meters) fully loaded
Width: 93.5 feet (28.5 meters)
Displacement: 15,800 tons empty and 34,600 tons fully loaded
Cargo: 6,000 tons of ammunition, 10,000 tons of non refrigerated dry stores, 1,200 tons of refrigerated dry stores.
Each enlisted crew member has a small locker for personal items and uniforms. Ships officers have more space for personal items.
Power System: 2 Fusion Reactors, average life span is 20 years
Market Cost: Not for Sale but costs around 300 million credits to construct. If found and sold on the black market would probably cost 1 to 2 billion credits.
- Four (4) Mk 44 “Sea Sabre” Combination Anti-Missile Defense Systems: One is
mounted on the front of the superstructure, a second is mounted on the
rear of the superstructure, and there are two mounted to either side of
the superstructure. This anti-missile defense system combines both a rapid
fire rail gun and a short range missile launcher. While mounted in one
system, both defense systems have separate tracking systems. The short
range missile launchers can target up four targets and can fire a volley
up to twice per melee. The rail gun is capable of destroying any missile
or inflicting serious damage on aircraft. The rail gun can fire on automatic
at up to six targets per melee (Has +3 to strike missile and +2 to strike
aircraft). The rail gun is very similar to those carried on the Sea King
Cruiser and it is likely that the Sea Kings rail guns came from a prototype
of this system. The system also can be used against other ships and ground
targets. The system has a 360 degree rotation and can elevate up to 90
degrees to fire at targets directly overhead.
Maximum Effective Range: Rail Guns: 11,000 feet (2 miles / 3.2 km). Short Range Missiles: As per short range missile type (See revised bomb and missile tables for details.)
Mega-Damage: Rail Guns: 3D4x10 MD per burst of 40 rounds (Can only fire burst). Short Range Missiles: As per short range missile type (See revised bomb and missile tables for details.)
Rate of Fire: Rail Guns: 6 attacks per melee. Short Range Missiles: 2 attacks per melee, can fire one at a time or in volleys of two or four.
Payload: Rail Guns: 8000 rounds (200 burst) each. Short Range Missiles: 16 short range missiles each.
- MK-41 16 Cell Tactical Length VLS (1): Mounted in the front
of the vessel. A very reliable VLS launcher, dating back from the previous
century, made in the USA, and exported to numerous countries. In place
of two long range missiles, each cell could also hold four medium range
missiles. This launcher usually carried only Surface to Air missiles of
various sizes with medium range missiles being the most common.
Maximum Effective Range: As per long or medium range missile type (See revised bomb and missile tables for details.)
Mega-Damage: As per long or medium range missile type (See revised bomb and missile tables for details.)
Rate of Fire: Can fire missiles one at a time or in volleys of two (2), four (4), or eight (8) missiles per melee and can be fired at multiple targets at the same time.
Payload: 16 missile cells in VLS launcher (Can carry a total of 32 long range missiles). Two long range missiles or four medium range missiles may be carried per cell, and a usual complement was 8 Long Range Missiles and 48 Medium Range Missiles.
- 30 mm cannons (4): Four 30 mm cannons were mounted on the
main deck, two on each side. These weapons had a good range and rate of
fire, but lacked the punch to do damage to large targets. Since they were
manually aimed, they were little good against missiles, and the crew often
joked that they were only good for "Shooting life boats and survivors in
the water". Each gun can rotate 360 and has a 180 arc of fire.
Maximum Effective Range: 10,000 feet (3048 meters)
Mega-Damage: 2D6 per round, and 1D6x10 for a burst of 30 rounds.
Rate of Fire: As per gunners Hand to Hand.
Payload: 600 rounds (20 bursts) each. Ship carries an additional 12,000 rounds of ammunition in magazines not including cargo. Autocannon requires 3 minutes (12 melees) to reload by properly trained personnel (Double for untrained crews).
- Sea Gnat Chaff Launcher (4): Located on the superstructure
of the ship, they are designed to confuse incoming missiles. Rifts Earth
decoys systems are assumed to not operate on Phase World missiles due to
technological difference. Reduce effects by 20% against smart missiles
(Add +20% to rolls for smart missiles.)
Maximum Effective Range: Around Ship
Mega Damage: None
- 01-35 - Enemy missile or missile volley detonates in chaff cloud - Missiles are all destroyed.
36-60 - Enemy missile or missile volley loses track of real target and veers away in wrong direction (May lock onto another target.)
61-00 - No effect, enemy missile or missile volley is still on target.
- SLQ-25F Towed torpedo decoy (1): A decoy which is towed behind
the ship. It generates a sound like the ships propellers in order to confuse
incoming torpedoes. Only effective at speeds below 25 knots. Otherwise
the noise of the ships systems and propellers is to powerful to mask. This
decoy can only be used when the Towed Sonar Array is not in operation.
Rifts Earth decoys systems are assumed to not operate on Phase World missiles
due to technological difference.
Effects: The decoy has an 65% chance of fooling ordinary non military sonars and non smart guided torpedoes, the decoy has a 35% chance of fooling military level sonars (like those of the Coalition), and the decoy has a 10% chance of fooling advanced military sonars (Like those of the New Navy and Triax) and smart torpedoes.
Maximum Effective Range: Not Applicable
Payload: One ready to use, with three more ready to deploy. It takes three minutes (twelve melees) to reel out another decoy.
The ship has all systems standard on a robot vehicle plus the following special features:
- Marconi/Signaal S1650M Air/Surface Search Radar: Long range air search radar system. Radar system has a range of 380 nautical miles (426.4 miles / 684.1 km). Radar system can track up to 480 targets simultaneously.
- Radar Defeating Profile & Radar Absorbing Materials: The ship superstructure is designed so that the radar profile of the ship is reduced and the ship is covered with radar absorbing materials. Because of this, attempts to detect the ship using radar are made with a -10% penalty to read sensor rolls when attempting to detect this ship. Go to General Detection Penalties / Bonuses for more information on penalties and bonuses to use with stealth.
- Combination Radar Detectors and Active Jamming System: Combination of radar detection system (ESM) and an active jamming system. The system can detect another radar system at 125% of the range of the transmitting radar. In jamming mode, causes -25% to detection but when it is active, other vehicles/ bases can detect that it is jamming, and some missiles will home in on jamming signals. Jamming also causes a -4 penalty to all radar guided weapons.
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Writeup by Kitsune (E-Mail Kitsune).
Copyright © 2002, Kitsune. All rights reserved.