First in the world of underwater minelayer Crab. Part 3. Fourth, the last option minelayer Naletova MP

Fourth, the latter mine layer Naletova MP, who was admitted to the building, was a submarine displacement of 500 tons. The vessel is 51.2 meters, width amidships — 4.6 meters, depth — 45.7 meters. The transition time of freeboard in an underwater position — 4 min. The rate on the surface is 15 knots with a total capacity of 4 x 1200 hp engines, underwater — 7.5 unit with a total capacity of 2 x 300 hp electric motors Number of Parts BATTERY — 120 pcs. Cruising range above water course at a speed of 15 knots — 1.5 thousand miles, scuba course at 7.5 knots — 22.5 miles. In the superstructure was found two mine pipe. Number of minutes — 60 of Naletova have zero buoyancy. Number of torpedo tubes — 2 with 4 torpedoes.

Housing minelayer consisted of a strong cigar-shaped body with a waterproof add the full length of the body. By sturdy cutting attachment body, surrounded by a bridge. The tip is made easy.
The main ballast tank was located in the middle of a strong body, which was limited with 2 flat transverse bulkheads and trim body strong. Bulkheads between a connected horizontally arranged anchors and pipes. A total of seven pipe connecting the bulkhead. Pipe larger radius (1000 mm) is in the upper compartment with its axis coincides with the axis of symmetry Underwater boats. This tube was used for the passage of the engine room of the dwelling unit. Other tubes have the smallest diameter of 2 to 170 mm tube, 2 — 400 mm, 2 — 700 mm. 170-mm tubes were used to supply the freshest of air from the main vent in the living room, while the other four tubes were ballast tanks of the highest pressure. Also provided for the bow and stern ballast tanks.

Apart from the head of ballast tanks, there were stern and bow trimming tanks, tank torpedozamestitelnaya and equalization tank. In the 2-mined tunnels were placed 60 min. Mines on the tracks that were laid in mine tunnels had to move with the rope or chain device, which is driven by an electric motor. Mine the anchor was a single system for its motion served four rollers. By controlling the number of revolutions of the motor speed and configuration of the layers, change the distance between the delivered mines.
Details of mine pipe, according to the specifications had to be developed after the construction of mines will be executed and tested on spec. landfill.

Drawings and specifications of the October 2, 1907 the plant, were considered in the mechanical and shipbuilding divisions of MTC, and then at the general meeting of the MTC (10 November), chaired by Rear Admiral AA Vireniusa and the role of the representative of the Naval General Staff. November 30 at a meeting of ITC addressed the issue of landmines, the sample case and hydraulic motors minelayer.

The requirements of the Maritime Committee of the Shipbuilding Division came down to the next:
Draft mine layer on the surface should not exceed 4.02 meters.
In surfaced metacentric height minelayer mine — a minimum of 254 mm.
Time relaying hydroplanes 20 seconds, vertical — 30 seconds.
With closed scuppers add minelayer should be waterproof.
The transition time from the surface position in the positional location — less than 3.5 minutes.
Performance of air compressors — 25 thousand ft3 (708 m3) of compressed air for 9:00, in other words, during this period of time was to come full resumption of supplies of air.
Suppressor submerged should lay mines, moving at a speed of 5 knots.
In surfaced minelayer speed is 15 knots. If the speed is 14 knots mene, the Marine Department has the right to renounce receipt minelayer. In the positional speed position (under the kerosene engine) — 13 knots.
The final choice of the storage system must be made within 3 months after signing the contract.
Housing minelayer, its kerosene and ballast tanks should be suitably tested by hydraulic pressure, with all this water leakage should not exceed 0.1 percent.
All tests of the underwater mine layer must be met in full armor, supplies, and at one hundred percent staffed team.
According to the requirements of the mechanical department of the Naval Technical Committee on mine wavetraps had set four kerosene engine, of an output of 300 hp at 550 revolutions per minute each. System engines was to elect factory for two months after the conclusion of the contract, and MTC had to approve the proposed system by the motors.
Seal raids after launching "Crab" on the water had to leave the factory, and the subsequent construction of the minelayer was carried out without his role. During the construction of the following peculiarities of the Ministry of Maritime Commission, which consisted of the officers.

After Misha Petrovic was removed from the building, "Crab" and the plant and Marine Department in every way tried to prove that the device is mine, and mines and even underwater minelayer are not … "Naletova system." In the MTC about September 19, 1912 was held on spec. meeting, which is recorded in the minutes: "The meeting made sure of sovereign Naletova no priority in the proposal for the submarine minefields with hollow anchor (at close to zero or zero buoyancy mines until it is in a submarine), as this issue was fundamentally designed for mine-Maritime department of the Technical Committee to supply the sovereign Naletova. therefore there is no reason to believe that not only developed mines, and the whole minelayer "Naletova system."
Creator of the first underwater mine layer Naletov MP lived in Leningrad. On retirement he was released in 1934. Mikhail Petrovich in recent years has worked in the department head of the Kirov factory mechanic senior engineer.
In the last 10 years of his life raids in his spare time working on improving mine-layers and submitted several applications for new inventions in the field. Zaleski NA MP advised Naletova on hydrodynamics.
Misha Petrovic, despite his illness and old age, to the last days in the design and improvement of the underwater mine-layers.
Seal raids died March 30, 1938. Unfortunately, at the time of stateliness Russian war and the blockade of Leningrad all the materials Naletova died.

All parts:
Part 1. The new project of the underwater mine layer
Part 2. Second and third choices of the underwater minelayer
Part 3. Fourth, the last option minelayer Naletova MP
Part 4. As there was an underwater mine minelayer "Crab"
Part 5. The first war patrol of the underwater mine layer "Crab"
Part 6. "Crab" is to repair
Part 7. End of the first underwater mine layer "Crab"

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