stealth marine

stealth marine

stealth marine

stealth marine

stealth marine

Observation and intervention yacht 'Assault 52'

Yartmarine Assault 52 was built in 2014 at the Yartmarine Shipyard, Phuket, Thailand. She was made with emphasis on requirements given by her purpose - being an observation and intervention ocean boat.

Her GRP planing hull deep-V shape has been made by 14 layers of chopped fiberglass spraying and hand-laid fiberglass. Only the highest grades of GRP/fiberglass and resin have been used for hull and superstructure. These modern methods of processing and using the highest quality material are essential requirements to achieve a high-quality product.

Special attention has been paid to simple operation systems, low maintenance and using the latest technologies. Two stations - bridge and fly bridge - provide two separated control stations for vessel navigating.

The interior has been layed out in a simple modern design for comfortable use and easy maintenance, with emphasis on efficient usage of the available space in order to optimize usage capacity.

Separated removable additional diesel tanks increase fuel capacity from the primary 1,400 liters to up to 5,000 liters, which extends the boat's range to more than 4 times of the original range. The engines have been completely overhauled by the engineering department of Yarmarine Co. Ltd., Phuket. The power system has been built with brand new marine-grade Kohler generators with extremely low consumption of diesel and low noise generation.

The latest Garmin Navionics systems have been installed on both control stations. This fully-featured integrated solution combines a high-class reliable system with intuitive control. An NMEA2000 network has been built as the basis of this hi-tech vessel and is ready to expand with any NMEA2000 devices in future.

Only the best technologies have been chosen in order to increase comfort and safety on the sea. The yacht sports the most expensive active gyro-stabilized FLIR thermal camera, which is capable to substitute for eyesight in total darkness, fog or any adverse weather conditions. The thermal camera range is 2 nautical miles (3.8 km). The additional daylight TV color camera is equipped with a 10x optical zoom.

One of the most reliable watermakers is installed on board. A Spectra patented high pressure Clark Pump provides reliable and highly efficient water production. Digital controllers provide comfort and a well-arranged control of the device to the user.

The decks have been made from exquisite teak and macca woods, with an anti-slip surface dressing to provide save movements on the deck, to protect the floor against hard conditions, and to even allow walking with shoes.

  • Serial number: 001
  • Type of vessel: Fiberglass Motor Vessel
  • Designed as long range observation vessel
  • LOA: 52 feet (15.85 meters)
  • Beam: 14 feet 9 inch (4.5 meters)
  • Draft: 4 feet 5 inch (1.35 meters)
  • Weight: 25 tons
  • Number of decks: 2
  • Number of control stations: 2
  • Number of cabins: 3
  • Number of lavatories (incl. showers): 2
  • Crew/passengers: 3 - 4
  • Built in: 2014
  • Deck surface: Teak/macca woods with anti-slip surface dressing
  • Engine idle speed: 8 knots
  • Cruising speed: 20 - 25 knots
  • Maximum speed: 33 knots
  • Range at idle speed: 1,500 nautical miles
  • Range at cruising speed: 500 nautical miles

  • Basic characteristics: Planing hull; deep V shape; dead rise angle: 18 degrees
    Material GRP/fiberglass
  • Number of layers 14
  • Manufacturer Yartmarine Co. Ltd., Phuket
  • The hull was made from one-off mold; chopped fiberglass spraying and fiberglass hand laid methods were used. No hull osmosis found.


  • 2 x MTU Detroit Diesel SERIES 60 14.0L
  • Number of cylinders: 6
  • Power 825 hp at 1,800 RPM
  • Engine serial numbers: SB: 06R0743481, PS: 06R0743367
  • Complete overhaul, performed by the engineering department of Yartmarine Co. Ltd., Phuket in 2013, including installing brand new GARRET turbochargers.


  • KOHLER Marine EFOZD family 11 kW, 1 phase, 230 V, 50 Hz, 1,500 RPM
  • Low diesel consumption (1 liter per hour at 100% power)
  • Serial number: 2269698
  • Shore power compliance: 220 - 230V, 50 Hz, 12 kW


  • Service battery bank: 4 x 200 Ah (total 800 Ah at 12 V)
  • Engine batteries: 2 x 200 Ah (total 400 Ah at 12 V each)
  • Rectifiers: 2 x SENTRY FR 1240; 40 A at 12 V
  • Backup inverter 1 x 500 W, 12 V/230 V
  • Within voltage battery protection system


    Total capacity: 5,000 liters
    Layout: 2 x 700 liters built-in tanks; 1x 800 liters built-in tank; 4x 700 liters extension removable tanks
    Total capacity: 600 liters
    Layout: 2 x 300 liters built-in tanks
    Capacity: 60 liters
    Discharging by macerator pump or suction line
    Tank level monitor
  • Capacity: 60 liters
    Discharging by automatic bilge pump


  • Propellers: 2 x 5 blades, 30 inch diameter, 41 inch pitch
  • Transmission units: 2 x TWIN DISC transmission box
  • Shaft sealing: DURAMAX
  • Steering system: HYNAUTIC; engine powered; dual station; hydraulic steering system with autopilot electric reverse pump
  • Bow thruster SIDE POWER SP75T; electric bow thruster; dual control
  • Trim Tabs BENNET; dual control
  • Electric winch: Windlass MAXWELL
  • Bilge pumps: Automatic electric bilge pumps
    Engine room: 2 x CO2 w/remote control
    Vessel: Hand-held fire extinguishers


  • NMEA2000 network fully capable total backbone 15 m; total drop 8 m
  • GARMIN GPSMAP chart plotter, S/N 3866593356, 3868650576, w/ integrated FLIR night vision
  • GARMIN GPS WAAS receiver, S/N 3865702955
  • GARMIN 4 kW high definition radar
  • GARMIN GHP 12 autopilot computer S/N 3863220899
  • GARMIN GHC10 autopilot control, S/N 3865610801, 3866413024
  • GARMIN Echosouder DST800
  • Dual GARMIN VHF 200 radio, S/N 1G9006119
  • AIS EZTrak Class B transceiver, S/N 5110018


  • Installation currently in progress
  • Model: M618CS
  • High resolution thermal night vision 640 x 480 pixels
  • Extended range performance via 35 mm lens
  • Range performance: Up to 4 km in total darkness or fog
  • 2-axes active gyro-stabilization
  • Color TV camera with 10x optical zoom
  • 360° pan, +/- 90° tilt
  • Dual control station


    Brand: Cruise Air
    Models: FX7C-P; FX24C-P
    Supported modes: Cooling and heating
    Capacity: 7,000 BTU/hr and 24,000 BTU/hr
    S/N: F030001, F030009
  • 1 x Hot water electric boiler w/capacity 50 liters; 1500 W; 230 V
  • 1 x JABSCO electric fresh water pump
  • 2 x JABSCO electric toilet macerators
  • 1 x JABSCO electric black water tank macerator
  • 3 x JABSCO blowers; shower and kitchen ventilation
  • 1 x fridge/ freezer
  • 1 x microwave
  • TV screen: Samsung
  • PIONEER DVD/CD/SD/MP3 player: iPhone/Android compatible; TV screen connection


  • Indoor & outdoor: Aluminium alloy 3 x 1 W MR16 style; warm white
  • Outdoor: Marine LED G4 style bulbs; warm white
  • Navigation lights: B15 LED bulbs


  • Brand: Spectra Watermakers
  • Model: Ventura 200T with MPC control
  • Production capacity: 750 liter per day
  • S/N: 11448-10

Jaroslav Horejsek
Technical Director
Yartmarine Co., Ltd.

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