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by The Felsinsel Anocracy of The Death Syndicate. . 21 reads.

Fallensteller und Korsar


FALLENSTELLER
A coastal submarine measuring 32.6 meters in length. It has four pressure hulls: A pressure hull behind the sail to contain the crew and motors, two pressure hulls side by side to contain the twelve sea mine tubes, and a pressure hull in the fore which houses the motors for its turning thrusters and can be equated to a dedicated battery room. The sail contains a diver lock out chamber for special forces operatives, with the four angled external torpedo tubes and the eight vertical tubes (533mm, but not long enough for a full torpedo) allowing for the carrying of compact swimmer delivery vehicles. The twelve tubes, being angled back and slightly outwards, are just shy of five meters long, allowing for three 1000mm mines each and the eight centerline tubes allowing for the deployment of 533mm special purpose mines. The chin holds a conformal sonar array, and above it is the active sonar array should that be required. The periscopes and snorkels are not hull penetrating, rather being nested between the two pressure hulls. This allows for a deeper maximum depth, perfect for avoiding radar detection. It has a unique contra-rotating pulsejet, powered by two electric motors. The motors are identical and placed in sequence, with one motor powering an axle that tapers through a tapered roller bearing as it goes through the other shaft. The use of a tapered roller bearings where the turbine blades meet, where the shafts nest into each other, and also where the outer shaft penetrates the hull allows for a great degree of reliability and reduces maintenance, while the configuration also reduces the mechanical complexity attributed to so many contrarotating propellers. To go slower and quieter, one motor can be shut off, but both in tandem allow for much higher speeds. This is because the first set of blades compresses the water, allowing the second set to spin much faster without creating cavitation. X-form rudders allow for safer operation in littoral areas and close to the seabed. The double hull configuration improves stability when above water due to the more ship like hull form it induces.

The origins of the Type II are as follows.

The Death Syndicate wrote:
Keilberth to Revolutionize Midget Submarine Manufacture
The Keilberth Shipwrights, owned by their namesake family, has recently announced a new explosive hydroforming technique for producing submarine hulls. Augustin Keilberth, heir to the Keilberth fortune and entrepreneur, has expanded operations in Unistan following the appointment of his uncle Konrad Keilberth as current regent until the houses can come to a verdict on the governance of the territory later this month. During this time he witnessed the creation of large cylindrical spheres for the safe storage of volatile chemicals, an important aspect of Unistan's exports. Inspired by this, he had created a new method for creating submarine pressure hulls that would reduce the time required to roll and weld all the plates from hours to but minutes. A statement follows.

"This new production technique allows for high strength, work hardened pressure hulls to be manufactured cheaply for and expediently, reducing the amount of labor and manhours required to make submarine hulls under three meters in diameter. What would once take us weeks to build a handful at a time, can now be done in days and in mass."

The methods by which this is done, however, is kept secret from the public. The following is from a classified abstract of the technique.

A decagonal prism is constructed, with each side being a singular plate pre-bent in the anticipated direction of the bulge. Equal length sheets of gusset plate are welded to the outside of the seams. The raised corners created by the gusset plates are used to guide the section into a concrete pit acting as a die. Metal punches are built into the concrete die to ensure each and every pressure hull as the necessary holes required for the fitting of weapon tubes, exhausts, and hatches are in their predetermined locations. End caps shall be built in a similar matter and placed in their own semi-sphere dies. These metal vessels are flooded with water and a length of explosive cord is lowered into it. The resulting detonation molds the metal to the die and the punched out segments can be removed with a hammer. The interior reinforcement, framework decking and related systems are built independently/simultaneously and inserted as in two units. First, the ribbing is inserted and welded to the pressure hull to improve dive depth, then the raft containing the components is inserted into the ribbing and the vibration isolated bed is bolted to the ribs. Any penetrating weapon systems are inserted at this time. Then, metal coupling rings are welded to the ends of the pressure hulls, and then the hull segments are aligned on a scaffold and bolted together. This completed segment can then be inserted into the secondary hull and joined to other pressure hull segments in pertinence to the Fallensteller class coastal submarine, or used as is with hull extensions for midget submarines and Dry Swimmer Combat Vehicles.

Rather triumphant and confident in this new manufacturing technique, three Fallensteller class submarines of this construction have been launched, even ahead of most of their cousins commissioned in Osteria. These new Fallenstellers have been designated the Type II due to differences in pressure hull construction.

This new type is nearly identical to the base version in every way except for cost and diving depth, which is improved thanks to the work hardening properties of explosive hydroforming.

Armament:

  • 4 533mm Torpedo tubes [no reloads]

  • 8 533mm mine chutes [8-16 mines]

  • 12 1000mm mine chutes [32 mines]

KORSAR
A patrol submarine meant to fill a gap in littoral warfare not easily filled by larger, louder, nuclear types of submarines. At 67 meters long, 11.7 meters tall to the sail, and with a pressure hull 7.6 meters in radius, it is relatively more compact than even the Raider class. LOX and Fuel cell AIP allow for a maximum submerged time of 28 days while providing an extraordinarily silent drive, with the unique annular skewback screws reducing the sound of propeller vortices and reduces the chance that the tips begin to cavitate. Active radar is located in the sail below the chinned section of sail, with a large conformal array in the chin of the submarine providing excellent submarine warfare capabilities. Like all good modern submarines, there are flank arrays and passive ranging sonars along the hull. The rudders are X-form, borrowing the smooth nacelle concept from the Raider class. One nacelle houses the towed sonar array, while the other acts as storage for combat swimmers, able to carry SDVs for their convenience. A six-man diver lock out chamber in the sail allows for the deployment of such swimmers. The chinned top and blended form of the sail reduces both the surface radar signature and the submerged hydrodynamic drag, while also making room for retractable "wake-homing" non-acoustic passive detection probes, which can be used to detect water density, chemical composition, sand, and radiation, which may be left in the wake of another submarine. This gives the submarine another method of trailing quiet submarines. Dedicated decoy tubes are located under the hull, firing downwards.

SSK/GN- The variant with VLS cells has 28 launch tubes in four rows, allowing for superior anti-ship capabilities. These tubes can carry a wide variety of ballistic and cruise missiles, particularly of Ostarian hypersonic varieties. While capable of land attack, their primary function is to engage enemy warships from a safe distance away. This can work in tandem with other systems. A radio buoy can be mounted in the storage nacelle, floating to the surface in order to receive targeting data from supporting craft in order to fire while submerged and outside of the range of it's radar optronics mast, before it can reel in the buoy and slip away into the deep. This variant is to be the most common production type.

Armament:

  • 8 533mm Torpedo tubes [32 reloads]

  • 4 533mm decoy chutes [16 reloads]

  • 28 VLS cells

SSK/AN- The special operations variant with extended drop keel and ammunition bunkers in the place of the missile VLS cells. These four bunkers have large, heavy hatches and are specially reinforced to help protect them in the event the submarine gets damaged. They can each hold a full reload of mines for the Fallensteller class submarine. For reloading at sea, a special housing was fitted to the rear of the sail. This bulge has two doors which slide to the side then back. A folding horse-head style level-luffing crane is housed here, packed into a special pressure hull that extends into the sail, displacing the optronics masts and replacing the diver lock-out chamber. It can be removed forwards and locked into the deck just before the silos. The reason why a mechanically level luffing crane was desired was to remove as much movement as possible when reloading at sea, with a simple winch being used to pick up and lower mines onto the other vessel. The keel is lowered such that a smaller submarine can dock with the ship. Where the long tubes for the missiles would be, there is now a small recess and waterproof hatch for docking with the sail of the Fallenstaller. The drop keel contains harnesses that lock into the deck and flood holes of the smaller submarine, securing it flush against the underside to reduce flow noise and improve hydrodynamics. This extends the operational capabilities of the smaller yet arguably stealthier Fallenstaller, which can lay mines in areas generally inaccessible to even the relatively (to nuclear submarines) compact Korsar. If need be, the mines can laid by the submarine itself with the aid of the crane.

  • 8 533mm Torpedo tubes [32 reloads]

  • 4 533mm decoy chutes [16 reloads]

  • 128 1000mm mines

  • 64 533mm mines

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