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2015 Gunboat GUNBOAT 60

$3,250,000 USD

Seller's Description


Arethusa is a Gunboat 60 like no other. It offers the ultimate multihull package and seamlessly combines luxury living with a high performance, easy-to-handle yacht.

Gunboat is known for its stylish catamarans and they are highly regarded in the industry. Since inception, the Owner and Captain have carefully developed the standard GB60 package and strived to further refine their sailing experience – and it’s paid off.

The boat is carbon fiber and its build was scrutinized to maximise weight efficiency and performance. Modifications include a custom Hall Spars rig, two Harken 990 winches on the aft deck and a redesigned forward cockpit. Carbon interior features are finished with an ultra-light veneer and high-quality appliances were installed to maintain the luxury feel.

Since its commissioning in 2015, Arethusa has appreciated upgrades to further optimise comfort, performance and safety capabilities. The highlights of these are:


  • Symmetrical daggerboards
  • Chainplate replacement
  • 30% larger fuel tanks
  • VIP cabin upgrades from Queen to King-sized beds (plus extra storage space)
  • B&G upgrade, new Garmin screens and repeaters for aft trimming stations


  • Streamlined and upgraded hydraulic pack with a more powerful pump
  • Two new 12-inch Zeus 3S chart plotters


  • Custom titanium steering quadrants with new cassette rudders and upgraded steering system


  • J1 and traveller system upgrade and reinforcement

Arethusa has proved itself as an outstanding live aboard for extensive periods whilst cruising throughout New England, Caribbean, Bahamas and New Zealand. It also has a minimum draught of 3.5ft making anchoring in beautiful, shallow waters hassle free.

Entertaining friends & family is effortless with its large aft deck lounge area, homely open plan dining and four spacious guest cabins. Those who have sailed her affectionately like to tell upon the stories of brunch and cocktails at 20 knots!

The boat can be quickly switched into regatta or delivery mode where 260-mile days are easily achievable. In the absence of wind, the twin 55HP Yanmar engines will motor comfortably at 9.5kts in flat water.

Kept in superb condition and meticulously maintained by professional crew; no expense has been spared to perfect the workings of this boat.

Arethusa is currently awaiting the ship to return from New Zealand where she is headed back to Newport, RI for a Summer of more enjoyment.

Additional Details


Builder: Gunboat

Designer: Nigel Irens

Keel: Symmetrical Daggerboards


LOA: 60 ft

Beam: 28 ft 4 in

Minimum Draft: 3 ft 6 in

Maximum Draft: 13ft 3in

Displacement: 32,000 lbs

Bridge Clearance: 98 ft

Engines & Power

Engine Type: Two diesel Yanmar engines; total 110HP

Drive Type: Sail drive

Generator: 12.5kW Panda rebuilt in 2020

Four Mastervolt MLI Batteries

Mastervolt Ultra Combi Inverter Charger

Shore power inlet and cable


Fresh Water Tanks: 2x 100 Gallons

Fuel Tanks: 2x 110 Gallons

Holding Tanks: 2x 40 Gallons


Number of cabins: five

  • 4x double berths (with king size beds)
  • 1x twin crew cabin

Number of heads: four

Interior Features

Central air conditioning and heating system with 6 thermostats

Hot water system

Fresh water maker

Electric bilge pumps

Bosch electric induction hob and Bosch electric oven

Vitrofrigo Refrigeration (2x fridge, 2x freezer)

Ice Machine

Electric heads

Entertainment system with television

Sail Inventory

Main - 154sqm – North 3di (2017)

Main – 150sqm – North 3di (2015)

J1 – 115sqm - North 3di fractional lock (2020)

J1 – 110sqm – North 3di fractional lock (2015)

J2 – 60sqm – North 3di (2019)

C3 – 177sqm – North Cuben CZ90 (2016) – masthead lock on KZ8 TD furler (2017)

R1 – 267sqm – North Aramid Cuben – masthead lock on KH10 furler (2015)

R3 – 192sqm – North Amarid Cuben – fractional lock on KH8 furler (2015)

A2 – 394sqm – North Nylon (2017)

Storm Jib

Rig Plan

Rotating carbon fiber Hall Spars Mast 94ft (7ft taller than standard GB60 rig)

Carbon fiber boom

Carbon EC6 standing rigging

Second set of PBO lower whisker stays

Rigging Projects main headboard lock

Custom performance longeron with integrated anchoring system

Shroud, tacking points and main sheet load cells

4x Harken 990 winches and 1x Harken 50.5 winch

Mix of Rigging Projects and Harken deck gear and assorted blocks and hardware


Hydraulic main sheet and rig rotation

Upgraded hydraulic pumps in 2019


B&G H5000 performance instruments

Navigation center: Two 12” Zeus 3S chart plotter and ship’s computer

Garmin 20:20 repeaters – four in forward cockpit and two aft deck

BEP Marine C-Zone system

Autopilot (port and starboard)




FLIR camera

Spreader and anchor cameras

Exterior Features

Flex Max Solar panels 32A input

Teak cockpit

Cockpit tables (Cocktail table and folding aft deck dinner table)

Cockpit cushions

AB 14ft aluminium tender with 50HP Mercury

Aft Deck bimini

Foredeck sun shade

Daggerboard Covers

Winch covers


# Built


Length Overall
Waterline Length

Rig and Sails

Reported Sail Area
Total Sail Area
Sail Area
Air Draft
Sail Area
Forestay Length

Auxilary Power

Fuel Type
Fuel Capacity
Engine Hours


Water Capacity
Holding Tank Capacity


Hull Speed

Hull Speed

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.


Classic hull speed formula:

Hull Speed = 1.34 x √LWL

A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL

Classic formula: ?
Sail Area/Displacement

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.


SA/D = SA ÷ (D ÷ 64)2/3

  • SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
  • D: Displacement in pounds.
<16: under powered
16-20: good performance
>20: high performance

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.


Ballast / Displacement * 100

<40: less stiff, less powerful
>40: stiffer, more powerful

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.


D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.


Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)

  • D: Displacement of the boat in pounds
  • LWL: Waterline length in feet
  • LOA: Length overall in feet
  • Beam: Width of boat at the widest point in feet
<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.


CSV = Beam ÷ ³√(D / 64)

  • Beam: Width of boat at the widest point in feet
  • D: Displacement of the boat in pounds
<2: better suited for ocean passages
>2: better suited for coastal cruising

This listing is presented by MultihullCompany.com. Visit their website for more information or to contact the seller.

View on MultihullCompany.com



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