Military Review

SEALION (SEAL Insertion, Observation and Neutralization)


The patent was filed in the 1990 year, but the first boat, now known as the Alligator-class, was not produced until the middle of the 1990's. After testing with the US military, the Alligator was handed over to the Israeli military. Illustrations from 1993 patents (US patent 5215025 related to K10 Corporation)

SEALION (SEAL Insertion, Observation and Neutralization)

These boats are similar in concept to the North Korean SILC boats. But compared with the known SILC, they are about two times larger. Unlike the later North Korean I-SILCs, they are not fully submersible.

Alligator class
Displacement: 23,4 tons
Maximum speed: 30kts (submerged 8)
Length: 19.81m, width 3,96 m

The rear cabin is removable, and the boat is often depicted with a large crew, which changes its overall appearance.

SEALION was originally proposed as an advanced technology demonstration concept (ACTD) in the spring of 2000.

SEALION is a technology demonstrator project led by NAVSEA and the Design Group surface ships (SEA 05D1). SEALION II is currently promptly managed by the Naval Special Warfare Group (NSWG Team 4) at the naval base in Little Creek, Virginia. He was taken to Little Creek in January 2003.
SEALION II was developed by Naval Surface Warfare Center (NSWC), and was built by Oregon Iron Works Azimuth Inc. of Morgantown, West Virginia.
This is a multi-purpose, high-speed, unobtrusive boat designed to perform a variety of missions.
In many respects, it looks like the Alligator boat, which found its use in the Israeli army, and Mark V, the boat that is currently used for such missions in the US Navy.

There are, however, significant differences. Both the Alligator and the Mark V have open decks at the stern, while the SEALION is completely closed, which serves as a shelter for the crew and passengers from bad weather or enemy fire. It also allows passengers to move around the boat unnoticed by prying eyes.

The body of SEALION is made of aluminum alloys, weight is about 72 000 pounds, has 71 feet in length - 11 feet shorter than the Mark V, which allows SEALION to transport it to the C-17 Globemaster. Mark V requires the C-5 Galaxy, which is larger and needs a larger runway to take off.
The Navy has the 20 Mark V (for the 2004 year), which are divided into 10 units. Each squad consists of two ships. A squad can be delivered quickly by two C-5 Galaxy or surface ships. Each squad can turn around within just 48 hours after receiving a notification and be ready for operation within 24 hours from the moment it arrives at the advanced operational base.
Each of them (Mark V) can carry up to 16 passengers, including a crew of five,
consisting of Special Warfare Combatant-craft Crewmen (SWCC).
Boat Mark V began to operate in the 1995 year, the gradual write-off of which began with the 2008 year.
SEALION, however, is not a potential replacement for the Mark. There is no comparison between them. SEALION is a technology demonstrator that can be useful in creating the Mark V replacement.
At SEALION, they abate (by 2004 a year), including measures to reduce the percentage of injuries, which is not uncommon when the boat is running at a speed of more than 40 nodes. On Mark V, this indicator reaches 25 percent.
The decrease in the percentage of injuries is also due to the improvement of seaworthiness in comparison with Mark V
Officials also refused to discuss the sea lion engines, but they noted that it is capable of developing speeds comparable to the Mark V.
In December 2003, the US Navy signed a $ 6000000 contract for the second version of SEALION.
SEALION, however, soon (in 2004 year) may receive some competition. The Naval Research Authority awarded $ 2.36 million in grants at the University of Maine's Advanced Engineered Wood Composites Center to create a successor to Mark V-Mark 6.

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  1. Dima190579
    Dima190579 28 May 2013 08: 36
    A good boat for sea fishing.
    1. Bongo
      Bongo 28 May 2013 09: 02
      Only the leer should be added, otherwise it will be washed away in FIG. smile
      1. carbofo
        carbofo 28 May 2013 11: 57
        Americans don’t need a rail, they stick them to the deck with shit.
  2. TROG
    TROG 28 May 2013 10: 49
    I remembered the series "Thunder in Paradise" ...
  3. Mikhado
    Mikhado 28 May 2013 14: 56
    Was not destiny the "author" to strain a little and completely translate the performance characteristics into the metric system?
    1. carbofo
      carbofo 28 May 2013 15: 29
      what is there to translate, a pound of 454 grams.
      30 feet with something centimeters, and I looked at the eye and frets.
      You're not going to sell our military to him.
      How to convert feet and inches to centimeters. 1 Foot (Foot) = 30.48 cm or 0.3048 m; 1 Inch (Inch) = 25.40 mm or 2.54 cm; 1 Foot = 12 inches; 5 Feet ...
    2. Simple
      28 May 2013 19: 10
      Next time sure. smile

      Although there the article itself could be corrected.
      Patience was not enough.
  4. Evgeny_Lev
    Evgeny_Lev 28 May 2013 16: 16
    I do not understand something, all this is just for the speed of 40>?
  5. Simple
    28 May 2013 19: 20
    The SEALEON boat is a technology demonstrator for future developments.
    The article is written.
    And the possibility of "drowning" also does not hurt.
  6. Argon
    Argon 28 May 2013 19: 42
    In general, the article is a minus, the narration is completely absent, some kind of set of reference texts. As I understand it, this is the idea of ​​a sabotage boat that is able to overcome the sentinel zone in a semi-submerged position, the samples shown are demonstrators of technologies designed to provide this. Why would he then "Stealth" technology? Its water will hide. Although with such a displacement even a small swell will throw it to the surface. In the "surface" position, the platform shown in the last 3 photos is extremely not seaworthy. Or are they going to build a river boat? Again, when moving on a cavern, the bottom part and the breaker will give a significant increase in RCS. Or am I wrong?
  7. Simple
    28 May 2013 21: 19
    You are reasoning correctly.

    There will not be enough information for the narration.
    I translate what is.

    SeaLeon boats can operate in coastal waters.

    “These boats are being built to explore the use of technology that could be used in the global war on terrorism,” said Captain Evin H. Thompson, commander of the NSWG 4.
    According to Thompson, SEALION II boats are used in the 4 NWGZS as a potential platform for testing various weapons systems and for conducting reconnaissance missions.

    Boats were used in Iraq to ensure the safety of strategic objectives in coastal areas, including oil terminals and sea routes of merchant ships.

    When designing the SeaLeon, emphasis was also placed on minimizing "Shock Mitigation" versus the Mark V.

  8. Simple
    28 May 2013 21: 54
    Power plant: two MTU diesel engines (total power-1136 horsepower) the boat is driven by two KaMeWa water cannons.

    1. The comment was deleted.
    2. Simple
      28 May 2013 23: 50
      Typo: total power is not 1136 horsepower but 2272 horsepower.

      In 2008, a generator set was installed on one of the SEALION II boats
      station - double G8500XM VIPER of AuraGen firm that provides 16000 W of continuous loading.
  9. Simple
    28 May 2013 22: 05
    The aft compartment holds the Zodiac with the Seal Team.
  10. The comment was deleted.
  11. Simple
    28 May 2013 22: 09
  12. Simple
    28 May 2013 22: 11
  13. Simple
    28 May 2013 22: 11
  14. 7 August 2013 18: 22