Boreal 47

Twin Aft Daggerboards

In addition to the centerboard, the Boreal 47 features two smaller, retractable daggerboards located in casings on either side of the shallow central rudder near the stern.  

• Helm Trim: These boards are a unique feature used to fine-tune the boat's handling characteristics. Dropping one of the boards can help balance the helm, reducing weather helm (the tendency to turn into the wind) when the main centerboard is loaded up.
• Enhanced Stability: When both aft daggerboards are lowered, the boat gains significant directional stability, sailing more like a traditional long-keeled vessel. This allows the autopilot to steer more efficiently, even for long periods, which is ideal for ocean passages.
• Maneuverability: With the boards raised, the boat becomes more responsive and behaves more like a lighter yacht, which is advantageous for maneuvering in confined waters like marinas or tight anchorages.
• Construction: The aft boards are made of polyester (designed to "fuse," or shear away, in case of a major impact) within robust aluminum casings, ensuring durability and safety.

Specifications

Boreal 47 – Lunacy

Exceptional Aluminum Expedition Cruiser – Fully Equipped & Ocean Ready

The Boreal 47 is widely regarded as one of the most capable and intelligently designed aluminum bluewater cruisers in the world. Lunacy is an excellent example of the model—robustly constructed, thoughtfully equipped, and maintained with significant recent upgrades in the past several years. With her insulated aluminum hull, centerboard/daggerboard configuration, watertight bulkheads, and expedition-level systems, she is purpose-built for high-latitude sailing, remote passages, and comfortable long-term living aboard.

Freshly updated mechanical systems (new transmission, mounts, shaft, seal, muffler, propeller) combined with a complete, well-maintained sail inventory and a comprehensive electronics and safety suite make Lunacy turnkey for her next adventure.

SPECIFICATIONS

LOA: 47.7 ft
LWL: 46 ft
Beam: 14 ft
Draft: 3'3" (board up) / 8'1" (board down)
Displacement: 26,638 lb
Ballast: 8,378 lb
Sail Area: 1,067 sq ft (100%)
Engine: 60 hp Nanni Turbo Diesel
Water Capacity: 200 gal
Fuel Capacity: 158 gal
Designer: Jean-François Delvoye
Builder: Boréal Yachts – Tréguier, France

CONSTRUCTION

• All-aluminum hull and deck, MIG/TIG welded in Argon; 5083/5086 alloys

• Bottom plate & keel: 10 mm; Lower chine: 8 mm; Middle/top chine: 5 mm

• Deck, roof & cockpit: 4 mm; Transom: 6 mm

• Full watertight collision bulkheads forward and aft

• Wide, shallow insulated keel with encapsulated lead ballast

• Aluminum NACA-foil centerboard (10 mm flats / 8 mm skin) with Ertalon bearings

• Two aft fiberglass/epoxy daggerboards for helm balance

• Solid aluminum standpipe through-hulls

• Sugar-scoop transom with four storage lockers

• Aluminum arch with fold-down tender gantry

• Synthetic teak cockpit & aft deck

• Integral chain run from bow roller to mast-base anchor locker

• Extensive insulation (50 mm deck / 80 mm hull above WL)

ACCOMMODATIONS

A warm, bright, practical interior with excellent visibility from the deck saloon and robust ash joinery.

Forward Master Cabin

• Double berth

• En-suite washing/shower compartment

• Multiple lockers & storage

Twin Aft Cabins

• Four single berths (2 per cabin)

• Opening ports & fixed hull windows

• Ample lockers and shelving

Heads

• Forward washing/shower room

• Aft head with Jabsco manual toilet, sink, and shower

Deck Saloon / Main Cabin

• Raised saloon with panoramic visibility

• Large L-shaped settee with table

• Centerline bench with backrest

• Heater ducting, fans, and excellent ventilation

• Stamskin upholstery throughout

Galley

• Twin stainless sinks

• GN-Espace 3-burner Propane stove/oven with 2/20 gallon Alloy US Tanks 

• Large water-cooled Isotherm fridge + fitted 100L top-loader

• Fresh & saltwater foot pumps

• 220V outlet and abundant storage

Climate & Comfort

• Refleks diesel drip stove with radiator circulation

• Numerous Caframo Sirocco fans

• Bug screens for companionway + four deck hatches

SAILS & RIG

Sparcraft Aluminum Mast & Boom

• Double spreaders, flat (non-swept)

• Carbon spinnaker/whisker pole on mast track

Winches

• (2) Lewmar 54 ST – cockpit

• (2) Lewmar 50 ST – cockpit

• (2) Lewmar 40 ST – mast

• (1) Lewmar 30 ST – mast

Sail Inventory

• 2021 Hallett Dacron mainsail – 2 full + partial battens, 3 reefs

• 2017 Elvstrom mainsail – full batten, very good condition

• 2025 Hallett genoa on Profurl furler (NEW)

• 2017 Elvstrom genoa – fair condition

• 2019 Hallett self-tacking staysail/solent on torque-rope luff with Profurl Nex continuous furler – very good condition

• 2017 Elvstrom asymmetric spinnaker with ATN sock – very good

• Rigid boom vang

• All halyards, reefs, and centerboard controls led to mast

MECHANICAL SYSTEMS

60 hp Nanni Turbo Diesel
Major recent service & upgrades including:

• New soft engine mounts (2024)

• New transmission (2024)

• New PSS shaft seal (2024)

• New Vetus waterlock muffler (2025)

• New prop shaft & cutless bearing (2025)

• New 4-blade feathering Variprop (2025)

• Spare fixed propeller

• Dual Racor primary filters

ELECTRICAL

• (4) 105Ah AGM house batteries

• Engine start battery

• Mastervolt 12–2000W charger/inverter

• Victron 110/220V isolation transformer

• Phillips battery & tank monitoring

• Two 100W solar panels on arch

• Superwind wind generator on dedicated mast

• High-output alternator

• Three electrical distribution panels (doghouse, saloon, forward passageway)

ELECTRONICS & NAVIGATION

• (2) NKE Multigraphic displays (doghouse & helm)

• NKE autopilot with remote (MOB function)

• Furuno chartplotter

• Furuno radar

• Vesper WatchMate AIS (transceiver)

• Icom DSC/VHF

• Iridium phone external antenna

• Comprehensive navigation station in doghouse

GALLEY

(As above; condensed for listing—can expand if needed.)

• Twin sinks; pressure H/C water

• GN-Espace stove/oven

• Water-cooled Isotherm refrigeration

• Foot pumps (fresh & raw)

SAFETY EQUIPMENT

• Ocean Signal Class II 406 EPIRB (NOAA exp. 10/26; battery exp. 11/29)

• Plastimo 6-person liferaft – next inspection 8/27

• MOM 8-A – next inspection 8/26

• Drogue (Galerider)

• Multiple life vests incl. inflatable harnesses

• Ditch kit, flares, two handheld VHFs

• Electric bilge pumps fore, aft, and amidships

• Manual pumps for engine bilge & central bilge

• Fire extinguishers (3 living areas + 1 engine)

GROUND TACKLE

• Lofrans electric windlass at mast base

• Maxwell remote

• 100 m chain

• 100' rope rode w/chain

• Spade primary anchor (bow roller)

• Spare Spade anchor

• Fortress aluminum kedge

• Stainless Northill folding seaplane anchor

TENDER & OUTBOARDS

• Achilles 9' roll-up dinghy (aluminum floor; custom long oars)

• 2023 ePropulsion Spirit 1.0 Plus electric outboard (bags for leg & battery)

• Tohatsu 5 hp 2-stroke + new tank

ADDITIONAL EQUIPMENT

• Windpilot self-steering vane

• Custom Gemini Canvas cockpit awning

• Cockpit shower & folding table

• Sea-Buoy 12V hookah diving rig

• Milwaukee M-18 2-gal battery wet/dry vac (with 2 batteries + 110/220V chargers)

• Tools, spares, fenders, dock lines

• Isotemp hot water tank w/engine calorifier + saloon heat blower

SUMMARY

Lunacy is a superb example of the Boreal 47—an extremely capable, intelligently engineered, go-anywhere aluminum expedition yacht. With her recent mechanical upgrades, updated sails, proven systems, and fully equipped inventory, she is ready for high-latitude passagemaking, remote cruising, or extended liveaboard voyaging.

Disclaimer

The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.