Sea serpent
The Sea serpent is an ocean going submarine owned by El Patético and used for their illicit operations. Primary function as a mobile command center but it is well armed.
Layout
Lower deck
Going from forward to aft on the lower deck, we first come across the main sonar, the air pressure tanks to blow the ballast tanks and the foldable bow planes. These are all situated outside of the pressure vessel, and are surrounded by the forepeak tank, used to trim the Sea serpent with ballast water.
Aft of that we come into the pressure hull of the ship, where we first have the messroom on the port and the galley and pantry on the starboard side. Then there is the double staircase leading up to the upperdeck. The staircase is separated by watertight doors. Aft of the staircase we find the Sickbay on the starboard side, then the Officer's quarters, and the Crew quarters on the port side.
The Missile hold, housing the six big ballistic missile launch tubes, cannot be accessed from the lower deck but it lays immediately aft of the living spaces. Followed by the engine room, also only accessible from the upper deck. Aft of the engine room lay the two separate rooms that house the electric motors used for the propulsion. Behind that is the battery hold and in the very end there is the after peak tank.
Upper deck
On the very forward, we first find the top section of the forepeak tank and the four torpedo tubes. Aft of that, the torpedo room where the launch crew works to load the torpedoes and a part of the torpedoes is stored. The torpedo room is closed by a watertight bulkhead. Aft of this is the forward missile hold. Housing the fourteen vertical missile launch tubes for the smaller SAM/SSM missiles, spare torpedoes, spare missiles, as well as other miscellaneous storage. This room has an (escape) hatch to the weather deck on top of the hull of the Sea serpent. This hatch is also used to load new torpedoes and other supplies, such as food. Also, this hatch is used to move the spare missiles from storage to the weather deck to load them into the launch tubes. The crew can do this at sea.
The forward missile hold is closed off with another watertight bulkhead leading into the staircase, and another watertight door leading to the bridge deck. This houses the command bridge, from where the Sea serpent is operated. The captain's cabin, his office, the radio room and the sonar room.
Behind the bridge-deck lays the missile hold, spanning both decks, with a walkway in between the six launch tubes leading into the engine room. Aft of the engine room we find the workshop with on the port side the air-conditioning room, and on the starboard the firefighting room. Aft again lays the air lock with (escape) hatch to the weather deck leading into the Remora if she is fitted. Or to the outside.
Behind Remora the hatch and towing installation for the towed sonar is fitted. Then we find the afterpeak tank, finishing off with a technical room with the actuators to control the X rudders.
Weather deck
The weather deck is the topside of the hull, all the hatches are constructed in such a way that they are flush with the deck when closed. Mooring gear such as bollards, chocks and fairleads are retractable into the deck to give the submarine a smooth hull when sailing under water.
Over both the forward and aft hatch, a davit can be rigged to hoist supplies in and out of the ship. Also, over the forward launch tubes, davits can be rigged to reload them.
Sail
The sail sits on top of the weather deck, and houses all kinds of equipment, such as the periscope and radio antennas. Also, a small lookout point is there for when the ship is sailing on the surface. The ship is still controlled from the bridge though, only communication equipment is placed on the lookout point to reach the command station.
Ballast tanks
Both in the forward and in the aft there are peak tanks fitted to control the trim of the Sea serpent On port and starboard of the pressure hull there are the main ballast tanks, split lengthwise in to four each. These tanks are used to control the deplacement of the submarine, allowing it to sink or surface. These main ballast tanks can be emptied with compressed air, stored into two tanks in the forward of the ship. The capacity of the air pressure tanks is enough to blow the complete main ballast tanks four times without the need for the compressor to fill them up.
Other tanks
The bottom of the Sea serpent is designed to work as a double bottom. Here fuel and fresh water is stored. As well as waste water, fresh and dirty oils. For obvious reasons, the tanks underneath the launch tubes aren't used for fuel, but are additional ballast tanks to regulate the stability by influencing the point of gravity of the ship.
The software crashed on me three days before the deadline.
I have to thank Sh4d0wPh03n1x for helping me safe an old file, and being able to show atleast half the model.
14 SAM/SSM +10 spare
32 torpedoes
5.000 nm using the batteries at 15 knots
1.000 nm using the batteries at full speed
"Kapitänin?" Mr. Fisher asked.
-"Ja, was ist los?" Rose replied.
Fisher was standing at the stern of the Sunset Dawn looking out over the water as he tends to do in the rare moments he went on deck.
"Wir werden verfolgt."
-"Was? Wo, ich sehe nichts am Horizont."
"Nicht auf dem Wasser, aber darunter." Fisher replied with a smile.
-"Hast du ein Periskop gesehen?" Rose asked surprised.
"Nein" Fisher paused for a moment. "Uns folgen zwei wellen."
-"Waves? We are followed by waves?"
"Sie segeln zu nahe an der Oberfläche. Schon zwei tage."
"-Was sollen wir damit machen?"
"Ignorieren." Fisher leaned over the bulwark drumming his fingers. "Wir wissen nicht, was sie wissen. Jetzt sind wir nur touristen.
Translation
Power & Propulsion
Propulsion
The Sea serpent is equipped with two variable pitch propellors driven by independed electric motors. These motors are powered from the batteries or directly from the main diesel generators when sailing on the surface or at snorkel depth.
Both the pitch and the rotation speed is regulated from the bridge, independed or controlled by the computer to match the ideal pitch and rpm to the current speed trough the water.
Power
The Sea serpent is equipped with two main diesel generators and one auxiliary diesel generator.
The main diesel generators produce 10.000 kW (12.500 kVA) each at 3~ 440 V.
The main diesel generators are used to propel the ship and supply power to everything else while traveling on the surface. The auxiliary generator is used in port, at anchor, or when floating offshore. It cannot be used to drive the electromotors that propel the ship directly, but it can be used to charge the batteries.
The auxiliary diesel generator produces 850 kW (1060 kVA) each at 3~440 V.
Communications
On the sail, one can also find several radio antennas and the satellite communication disc. Covering all possibilities. All those are retractable into the sail for underwater operations.
Weapons & Armour
Aft of the sail, there are six vertical missile tubes, housing six ballastic missiles, one in each. The missiles can be launched while at the surface and while submerged up until operational depth. Normally the tubes are sealed air and watertight, and prior to launching they are flooded with outboard water and the hatch on top opened.
Forward of the sail there are fourteen vertical missile launch tubes for SAM/SSM missiles. These missiles can be launched while the submarine is at the surface and while it is submerged up until 100 meters of depth. The tubes can be reloaded by the crew, unlike the ballistic missiles which require a shore crane. A davit can be rigged over the forward hatch and over the launch tubes and this way spare missiles can be loaded in the tubes, even while at sea if the weather allows.
In the bow, there are four forward facing horizontal torpedo tubes. In the torpedo room there are twelve torpedos on standby. Five on each side in the racks, and one on each loading lift. There are an additional twenty torpedos in secondary storage.
The Sea serpent is unarmoured, it's defense is to go unnoticed, and everything is done to improve the chances of that happening.
Sensors
Sonars
In the bow of the Sea serpent the main sonar is fitted under the torpedo room, capable of both active and passive operations in multiple frequencies. In combination with the side sonar arrays, it can also look upwards.
Along both sides of the hull, there are sonar arrays. Over the length of thirty meters, they are placed halfway up the hull on the parallel sides. Running for-and-aft. These multi-beam multi-frequency side-scan sonars can be both active and passive. Active they can make pictures of the sea floor under the Sea serpent as well as things above and to the side of the submarine. Passive they can very precisely pinpoint the origin of a sound because of their long length.
In passive mode, if a sound source is identified and located, the computers of the Sea serpent can produce images of the surroundings with the ping of another source and how the echoes are received by the Sea serpent.
In addition, there is also a towed sonar, a small hatch in the stern of the Sea serpent can deploy a sonar bulb on a 2500 meter line. This creates a gigantic antenna which highly enhances the accuracy. Also by putting the towed sonar to active, and the hull mounted sonars to passive, potential enemies can be fooled into thinking the Sea serpent is more than a mile away from the actual location.
Sail mounted sensors
In and on the sail are several sensors, most of which only useable above water. The periscope is the best known instrument, it primarily is a tool to view above the water service while sailing just below it. It is equipped with build in compass, sextant, magnifiers, camera, infrared camera, range finder. The periscope is lowered and raised with hydraulic power, and is built strongly to withstand the pull of the water when the submarine is moving.
Also there is a radar scanner and the electrical warfare mast. The radar is there to find surface or air targets for navigation or hunting purposes. The electrical warfare mast is equipped with sensitive radio and other electronical signals sensors, capable of determining the direction of the origin and the range. Also, it is capable of sending jamming signals in multiple frequencies. The radar and e-warfare mast can only be deployed when the whole sail is out of the water, and are retracted into the sail before the Sea serpent dives.
Auxiliary systems
Snorkel
On the aft of the sail the snorkel is fitted, this is an air supply pipe for the engines, that is extendable the same as the periscope, and it can be deployed while sailing at periscope depth. This way the Sea serpent can run her main diesel generators while sailing under water.
Just aft of the snorkel are the exhausts of the engines fitted also extendable to above the waterline while sailing at periscope depth.
Control surfaces
The Sea serpent is built with X rudder on the stern, instead of the traditional + rudder and rear stabilizer arrangement. The X rudder requires more tech to operate the flaps, as they need to move independently from each other. But they can be longer than their + arranged counterparts. They fill the diagonal of the square space the hull takes in. With the X arranged rudders being longer, they can be thinner and all in all have less surface area, create less drag and be quiter.X rudders also aid in the manoeuverability as all four are used to change course or change depth. Also, because the rudders are longer, their control surfaces can be shorter for the same surface area.
In the front of the Sea serpent bow planes are fitted, together with the X rudder on the stern, they control the depth and pitch of the ship. The bow planes are foldable into the hull as they protrude out beyond the side of the hull. This allows for mooring and better surface sailing.
Airconditioning
The submarine is fitted with an air-conditioning system that uses an elaborate washing installation to take the carbon out of the CO2 and refresh the air for the living spaces with oxygen. Aswell as the necessary heating and cooling. This system allows the submarine to stay submerged for three months.
Fire fighting
To fight fire, the Sea serpent is fitted with a CO2 suppression system for the engine room, forward and aft missile holds and the torpedo room. In case of fire, these spaces can be flooded with CO2 to deprive the fire from oxygen and extinguish it. All other living spaces are protected by high fog sprinklers, drawing water from the fresh water tanks.
Remora
On the back of the Sea serpent a secondary small submarine is carried, named Remora. Attached to the aft hatch with a watertight seal so that the crew can move from one to the other.
Remora is a fully electric submarine, which can house eight people, and is generally operated by two crew members but can be sailed single-handed. It does not have any armament, but is equipped with two mechanic arms and space to store items in a compartment under the hull or on the side of the submarine.
The name Remora comes from the fish with the same name that sucks itself to bigger fish to hitch a ride.
Very cool
Thank you