aluminium sailboat gennaker

Specifications - Design concept

54' aluminium sailboat with pilot-house and lifting appendages


A vessel that can operate sustainably and autonomously with maximum safety in the toughest marine environments.

  Safety and simplicity first, without neglecting comfort and performance

General arrangement

A vast pilothouse with panoramic view and true internal steering including a diam. 700 mm wheel (removable) plus engine controls. A simple watertight door easy to close and a couple of stairs to an ergonomic cockpit with a central sturdy teak table and a sheltered watch area below the coachroof top extension.

As for the interior arrangement, a first area with nav. station, chart table, inside steering, weather gear locker, aft head, then a dry zone with saloon (retractable video/TV screen), switchboard, galley (2 drawers fridge, freezer, sinks, cooking stove, Corian countertops), stove, fore heads with washing machine spot, separated shower cabin and sauna. Four cabins : 2 aft, 1 central; 1 fore under the mast, 8 berths including 2 doubles (queen size) and one dedicated seaberth close to companionway below navigation station, plus 1 or 2 sleeping spots in saloon (or "tatami" when table lowered). A cosy warm atmosphere (wood choice), while light and airy with panoramic view thanks to the pilothouse arrangement and the numerous portholes and hatches; a sense of spaciousness without dangerous open spaces, too wide and without handholds.
Sea-berths well located indeed to remain confortable at sea or at anchor. For hot climates protections of pilot-house coachroof front panels (custom made awning which can be used at sea with winds up to 40 knots, "Batyline" coverings, inside blinds with large horizontal strips. Heavy insulation and excellent ventilation through numerous air vents, hatches and dorades.

A vast walk-in forepeak (3m/9+ feet long) with a workbench and lots of storage room. Large engine and technical room under pilot-house floor. A large lazarette aft with dedicated technical lockers (propane bottles, gas jerrycans, diving bottles, aft anchor, mooring lines, life-raft, 20CV outboard engine). 3 watertight bulkheads. A short sugar scoop and a folding bathing platform with a true diving ladder. Sturdy arch for dinghy (incl. lifting device), solar panels, wind generators and antennas.

Pilot-house with inside steering


Detailed features

  • 54 feet (hull length) aluminium centerboarder, cutter rig, modern and powerful hull design
  • Hull bustle (long skeg) perfectly integrated into the design yielding an advantageous lower position for the lead ballast and engine, and protecting the propeller. Naca profiles rudders and centerboard (4 to 12 feet draft up or down). Lifting rudders under the hull bottom (i.e. not outside the transom) totally integrated into "rudder boxes". "Kick-up" collision device with simple hydraulic security.
  • Comprehensive sail plan : storm sail on removable baby stay, self-tacking staysail on roller furler, main with 4 reefs, genoa on manual roller furler (central electric winch available in cockpit), solent (furler), gennaker (furler), asymmetric spinnaker
  • Main diesel engine 115 CV/85 kW (max. 135 CV/100 kW), shaft drive, constant velocity joint, MaxProp auto-feathering propeller (5 blades), emergency 3 blades fixed propeller
  • Safety : watertight pilot-house door, 3 watertight bulkheads (bow, forepeak, lazarette), welded aluminium thru-hull fittings and seacocks above waterline, watertight closures for all air vents, control lines back to cockpit, equipment redundancy (steering, auto-pilot, heaters, converters), Armaflex insulation (fire resistant), double glazing, 2 emergency exit hatches in rear cabins plus cockpit/lazarette hatch opening above waterline if rolled over, floor locking devices
  • Autonomy and self-sufficiency : significant fuel tankage (2000 liters/530 gal.), main battery service bank 660 AH 24V, engine batteries (110 AH 24V), windlass & bow-thruster (220 AH 24V), 2 wind generators, solar panels (2 x 100 W on arch + 400 W on roof), hydro-generator, 2 alternators on main engine, DC 24V Fischer Panda generator; water tankage (1000 liters/265 gal) + water-maker 100 liters/hour; lots of storages : galley/saloon, 2 drawers fridge, freezer with top opening, vast walk-in forepeak, lazarette and numerous dedicated deck lockers
  • Pilothouse with panoramic view, aluminium (Sealium) roof, inside steering with removable wheel
  • Significant load carrying capacity (5T); max. loaded displacement 24.5T (tankage 95% full, plus 10-12 crew members) vs. light displacement of 19.5T (43 000 lbs)
  • Weights centering: tanks, batteries, moorings (chain and anchors), equipment, gear
  • Comfort for all types of navigation or life on board : ventilation (hatches various orientations, dorades, air-vents), cold areas (heavy insulation, ventilation against condensation, heating, entry airlock), warm climates and moorings (awnings, bimini, blinds, cockpit large teak table, outside shower), navigating upwind (central & aft cabins berths + possible single berth in saloon), harbor docking (electrical heater, microwave oven, water boiler, washing machine, saloon "tatami", TV-video screen)
  • Optimized interior layout and transitions from wet/navigation to dry/resting zones (deck, cockpit, below roof-top shelter, pilot-house door, weather gear locker, inside steering, navigation station, galley sinks (+thermos/kettle), aft head, galley cooker, saloon with stove in central position, cabins
  • 4 independent cabins for passages with 8 fixed berths; up to 10-12 people when including saloon "tatami" and possibly 2 additional linen bunks in forepeak when changing gear (family party and/or coastal cruising in warm areas)
  • Sandwich wood panels for bulkheads/furniture for optimized weight and acoustic insulation, insulated floors (40 mm thick) with locking devices
  • Owner's cabin with large double berth under mast (more comfortable vs. a forefront cabin), opening on saloon (closed by shutter or blind)
  • One central single berth cabin (ideal for rough navigations) and 2 aft cabins with 2 single bunks (port) and 1 double + 1 single seaberth navigation bunk (starboard), technical zone in-between cabins
  • Vast walk-in forepeak (3m/9+feet long) with sturdy workbench and vice
  • Waste water tanks consistent with regulations
  • Cockpit with easy access to the sea or RIB tender. Winches and control lines located around the 2 helm stations in central cockpit area less exposed to rough seas with breaking or rogue waves. Resting area with large teak table and 2 watch sheltered positions under coachroof top extension on each side of the pilot-house watertight door
  • Large bathing folding platform, diving ladder, 150m rear mooring line on roller reel
  • Rear lazarette with dedicated lockers, lateral deck lockers for propane bottles, gas/fuel jerrycans, life-raft, water jerrycans and grab-bag, diving bottles, outboard engine, etc
  • Bow knuckle chainplate (land towing, useful if additional long bowsprit), hydro-generator mount on transom bottom which can be used for the outboard engine in case of emergency and main engine breakdown

  The project genesis

lifting twin spade ruddersLifting spade rudders integrated into the hull and transom. Note the rudders do not need to be lifted for the boat to dry up at low tide, naturally settling on her thick skeg sole. This is however an important safety factor in case of collision with floating debris.


  A seaworthy boat thanks to numerous details

An example below among several other technical details (click on above title for more) making this boat quite suitable to exploration sailing from the high latitudes to the tropics propeller guard - protection cagePropeller protection cage for navigations into brash ice, easily installed after drying up the boat at low tide


See also : a summary of key features and a slideshow of this custom aluminum exploration sailboat


  Hybrid propulsion (option)