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Project 1171 Tapir / Alligator class - Design

BDK ships of project 1171 Tapir could be used for both military and civilian purposes, but because of this, the original characteristics of the project were changed. The ship had to: have high efficiency, good cabins for the crew and at the same time carry diverse weapons and special equipment, have increased unsinkability, high speed and use the entire volume of holds. Outwardly civilian, the ships of project 1171 were used only in the interests of the navy.

The ship is intended for transportation by sea and landing on an unequipped coast of a military unit (numbering up to a battalion) with mobile armored vehicles and vehicles. It can also be used as an ammunition transport, including for transporting ballistic missiles in containers or other large-sized combat equipment.

BDK pr. 1171 is designed on the basis of a multi-purpose dry-cargo vessel. The ship is two-deck, with a forecastle, poop, aft engine room and a five-tier superstructure. With four holds, one of which is located aft of the engine room. Hatch covers do not clutter up the upper and cargo decks. The hull is divided by watertight bulkheads into seven compartments. Large-sized cutouts in the main transverse bulkheads on the cargo deck for loading and unloading mobile equipment have mechanized bulkhead closures (gates) with remote control.

BDK are designed for landing amphibious assault forces with military equipment on an unequipped coast with a small bottom slope (and floating equipment - on the water) and for the transfer of troops and cargo by sea. The 1171 class ship can accommodate 20 or 45 (or infantry fighting vehicles), or 52 trucks (ZIL-131 type). The number of troops (depending on the modification of the ship) is 313 or 440 people. The BDK can carry up to 1000 tons of payloads. On the bow of the BDK there is a landing ramp in the form of sliding bow and stern gates. The Tapir class is armed with one 57-mm universal twin shipborne artillery mount (AU), two Grad-M multiple launch rocket launchers (MLRS) and two to three Strela-3 man-portable air defense systems (MANPADS).

BDK ships of project 1171 Tapir design is a multi-deck Ro-Ro type with a twin-deck (length - 90 m, width - 9 m) running along the entire length of the ship, with a developed superstructure, which houses the ship's control rooms, crew cabins and etc.

In its upper part there is a navigation bridge, and on the roof there is a mast with antenna posts of various radio-technical weapons systems placed on it. The superstructure of the ship is located only at the stern, where there is a sealed folding port, which in the lowered position serves to load equipment from the pier (when mooring astern). The compartment for armored vehicles is located in the bow, there is also a landing ramp (closed by sliding gates). Loading of equipment can be carried out under its own power through the bow or stern landing gear. In the first and fourth tween decks there are cockpits for landing troops. The ship has cranes for loading cargo onto the upper deck or into the tween deck through hatches in the upper deck.

The main power plant (GEM) of the BDK includes two 58A diesel engines with a total capacity of up to 18,000 liters. with., working on two propellers. The power plant is located echelonally in two onboard compartments. The ship is equipped with a navigation radar station (RLS) "Don" and radio communications.

The ship is equipped with a bow landing gear with main and additional folding gangways and remote control of all its units. In addition, there is aft closure-gangway, which provides reception and unloading of mobile equipment on a pier or wall. The transported equipment can move around the entire cargo deck, with its exit along the interdeck gangway for placement on the upper deck. Project 1171 ships are capable of vertical loading of various cargoes with their own means. To do this, they are equipped with four (for pr. 1171 mod. I and pr. 1171 mod. IT) or two (for pr. 1171 mod. III and pr. 1171 mod. IV) deck cargo hatches, a crane with a lifting capacity of 7.5 tons In addition, the ships of the first modification had two cranes with a lifting capacity of 5 tons each.

The BDK has a special stern anchor device that keeps it in place when receiving (unloading) equipment from an unequipped shore, and also pulls it aground when moving away from the shore. For the personnel of the Marine Corps, sleeping quarters are equipped in the hull, and the crew is accommodated in the superstructure. It was possible to increase the landing capacity to 400 marines on the last two modifications of the project by equipping an additional cockpit in hold No. 1.

The ship has (despite the presence of a bow landing gear) good seaworthiness, a long cruising range at full speed, good landing capacity, and the possibility of its wide use for transportation in holds and tween decks of general cargo with a total mass of up to 3750 tons. Two utilization boilers are located on the gas outlets of the main engines steam capacity of 700 kg/h. Experts consider the disadvantages of the BDK pr. 1171 to be insufficient full speed, weak artillery weapons and insufficient unsinkability for a warship , since it was designed in compliance with the norms of the USSR register.



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Page last modified: 24-03-2022 19:22:21 ZULU