As exhilarating as it is luxurious, the Extreme H2O racing catamaran seamlessly blends breathtaking performance with eye-catching design. Meticulously customized from the ground up, Extreme H2O truly stands in a category of its own.

Aesthetically arresting carbon fiber appointments throughout the cabins and structural components not only provide extreme strength, but also extreme sophistication. All of these structural and technical advancements make Extreme H2O one of the most impressive performance cruising catamarans in the world.


  • LOA: 66′ (20.1 m)
  • Beam: 28.3′ (8.6 m)
  • LWL: 62′ (18.9 m)
  • Mast Length: 88.6′ (27.0 m)
  • Mast Height Clearance: 95.2′ (29.03 m)
  • Minimum Draft: 2.2′ (.6 m)
  • Maximum Draft: 15.8′ (4.8 m) 
  • Displacement (Light): 37,078 lbs (16,818 kg)


  • Fresh Water Tanks: 1 (100 Gallons)
  • Fuel Tanks: 2 (75 Gallons)

All Sails by North Sails

  • Mainsail #1: 186m2, 3Di, 760i (37,200 dpi) with 2 offshore plys, 3 reefs, 6 full C-Tech carbon battens
  • Mainsail #2 (2016) 193m2, 3Di, 870 RAW, 2 offshore plys, 3 reefs, 5 full C-Tech carbon battens
  • Fractional screecher 106m2, 3Di, 760i, RAW, 19,600 dpi, on vectran luff cable
  • J1: Mast Head screecher 150m2, 3Di, 760i RAW on vectran luff cable for bottom up furling
  • Solent: 72m2, 3Di 760i (39,800 dpi), Hank on
  • Staysail: 41m2, 3Di 760i (35,000 dpi) roller furling on Vectran luff cable
  • MH0 reacher: 265m2, 3Di 760, 16,800 dpi, internal aramid luff cable for bottom up furling
  • R1 (2016): 3Di 87 Raw, 8820 Dpi, internal luff cable, top down furling
  • A3: 350m2, laminate, designed for external aramid luff cable for top down furling
  • A4: 400m2, SK150, designed for external luff aramid luff cable, top down furling
  • A1: 358m2, NDPO 69/49 (polyester) designed for external aramid luff cable, top down furling
  • FRO: Fractional reacher: 186m2, 3Di, 16,800 dpi, internal aramid luff cable bottom up furling
  • Mast, Boom, Forward Beam and Longeron all prepreg carbon by Southern Spars New Zealand
  • Standing Rigging is EC6 by Composite Rigging
  • Aramid running backstay


  • (3) refrigerators
  • freezer drawer with ice maker
  • Gaggenau 5 burner stove
  • Double stainless sink with Grohe facet
  • Miele whole bean coffee system
  • Miele microwave
  • ENO gas oven

Deck & Equipment:

  • All hatches by Lewmar
  • All portlights by Gebo
  • Longeron-mounted tack line winch: manual Harken 60.2
  • (4) Harken hydraulic winches in forward cockpit Winches
  • (2) Primary Winches: Harken 990.3 ST
  • (2) Secondary Winches: Harken 60.3 ST
  • (2) Harken 60.3 aft cockpit winches used for traveler and davit lines
  • Hydraulic: mainsheet, cunningham, running back stays, and mast rotation

Ground tackle:

  • Spade S200 Anchor
  • 100ft Chain and 200ft ¾” Rode
  • Lewmar V5 hydraulically driven Anchor Winch
  • Danforth day anchor


  • Falcon 450 RIB with center console with 30HP Honda Engine

Electronics and Navigation:

  • WTP3 processor
  • Forward cockpit: (4) 20/20 displays and (2) race displays all mounted on mast
  • Main cabin: (1) graphic display at Nav station and (1) graphic display at interior helm
  • Aft cockpit: (4) race displays
  • H5000 barometer module
  • H5000 3D motion sensor
  • B&G 57” mast wand
  • Celesco string pot for mast rotation sensor
  • Celesco string pot for rudder position
  • Simrad GS70 GPS
  • Furuno GP33 GPS
  • Furuno FA 150 AIS transponder and display
  • Icom M400BB VHF with integrated AIS antenna
  • Standard HX290 portable VHF
  • B&G 4G Radar
  • F250 Sat Com
  • Nauticomp 15” sunlight monitors
  • Intense PC, Windows 7, RAM 8GB, Core 1.8GHz
  • copies of Expedition software
  • copy of Deckman software
  • NavNet 3D Vector MapMedia US West Coast and Hawaii Charts
  • Globe Surfer Quad band 3G
  • Cell phone receiver
  • Wave Wifi booster for onboard wifi
  • B&G H5000 Autopilot Computer & Controller located at interior helm
  • Raymarine Hydraulic Linear Drive Type 3, hydraulic drive system
  • headstay load cell
  • shroud load cell
  • mainsheet load cell
  • C-Zone CAN-Bus control for non-critical electrical systems

Electrical, Power & Equipment:

  • Hybrid system for Extreme H2O
  • (2) 4-cylinder Volvo D2-40 20kW generators, output of 260–320 VDC
  • (2) High efficiency water-cooled AC motors with 25kW continuous and 40kW peak power
  • (2) AC motor Traction controllers, liquid cooled, DC input, AC motor output
  • LiFePo4 battery bank, 288 volt nominal, 28.8kW, 11 enclosures, 8 cells per enclosure
  • 4kW AC/DC shore power battery charger
  • (2) 250-320 VDC to 24 volt charger
  • (1) 100–400 VDC to 12 volt charger
  • (1) 250–320 VDC to 230 VAC inverter – liquid cooled to run all appliances (aircon, microwave, refrigeration)
  • 20 gal Torrens water heater (Heated by engine and AC)
  • 110V AC Sockets in all cabins and heads
  • (4) double staterooms in hulls
  • (1) crew cabin port forward
  • (3) full baths with carbon washing basins and carbon counter tops with stand up shower
  • Port Forward Compartment: gear and sail storage
  • Stbd Forward Bow Compartment: large sail locker can fit the entire sail inventory on shelves.
  • Salon: Large dinette to port. Seats 10 with storage underneath. Additional settee area with coffee table, drop down for day bed.
  • Elevated navigation area, forward.
  • U-shaped Galley (“Up”) – 5 burner Gaggenau stove, (3) refrigerator drawers and (1) freezer with icemaker, built in Miele Mtouch whole bean coffee system, Miele microwave and gas oven.
  • Flat screen TV on electrical lift disappears in the captain’s seat for a modern interior look.

“Extreme H2O” began construction in South Africa by Gunboat. After the Gunboat facility shut down, the boat was moved to the US and completed by Westerly Marine – a custom boat builder located in Santa Ana, California. Westerly Marine specializes in carbon fiber performance vessels. Over 56,000 hours were required to complete the boat to certified standards.

  • Hulls: Carbon inner and outer skin with 25mm Corecell sandwich
  • Cabin: Carbon inner and outer skin with Nomex honeycomb and Corecell sandwich
  • Cabin soles: Carbon/Nomex honeycomb sandwich
  • All secondary taping Carbon fiber/Epoxy and post cured
  • All laminates vacuum-bagged and post cured

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