Royal Huisman says that construction of the 58m sloop 'Ngoni' progresses on schedule for delivery in spring 2017.

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‘The Beast” is a 58m Dubois-designed sloop in build at Royal Huisman

Royal Huisman has announced that Ngoni, the 58m sloop designed by Ed Dubois, is currently being outfitting at the yard. With the aluminium work complete, the project remains on schedule for delivery in spring 2017.

The project was presented to the public during the 2014 Monaco Yacht Show and it was known as ‘The Beast” due to the dramatic brief from the client.

The bow section with its flush deck furlers has been proved in wind tunnel tests to create less wind disturbance to the leading edge of the headsail when compared to a conventional bow.

The hull combined with a powerful 71m (234ft) Rondal mast demanding high forestay tensions requires all the stiffness that advanced engineering can mastermind. A detailed Finite Element Analysis (FEA) of the structure as a whole revealed considerable compressive down forces.

The superyacht builder says the reverse inflection to the sheer alone has accounted for a 12% increase in strength for an equal amount of material. “This is especially relevant considering the large cut-outs in the foredeck for deck sail lockers, a tender garage, crane, spa pool and sealed waste locker, whilst below the waterline there are cut-outs for two submarine anchors and the fully retractable bow thruster,” reads a statement.

Ngoni also features an all carbon Rondal mast and “style to order” in-boom furler designed to carry a powerful square-head main by North Sails NZ.

A special system has been devised whereby the top of the square-head main and its diagonal batten can be completely furled out of sight into the boom. A mainsail headboard lock alleviates compressive loads to the mast tube whilst halyard creep is completely negated at full hoist and reef points.

The “style to order” performance boom is designed to complement the yacht’s exterior aesthetics that incorporates Rondal’s proprietary outhaul car that maintains the mainsails foot and leach tension at all hoist positions.

The boom’s open forward end means the furling process can be visually checked to keep the luff perfectly controlled. Computer simulations aside, a working test model complete with mainsail, mast section, and 7-metre boom has been built for continuous testing by Rondal’s R&D division.

In line with the performance parameters requested by the owner, the carbon fibre standing rigging by Carbo-Link provides some 70% weight reduction over conventional Nitronic rod rigging. Royal Huisman claims.

To further reduce weight and drag, the team opted for continuous shrouds from deck to masthead with internal connections where diagonal stays meet the mast tube. All in all, they provide less weight and drag, greater service life and fewer points of failure if compared to Nitronic.

Because the square-head main prevents the use of a fixed backstay, there are two running top stays with a deflector mechanism, as seen on grand prix racing yachts.

Ngoni’s lifting keel features a monolithic keel trunk milled from solid aluminium to support close to 100 tonnes of fin and lead bulb weight.

Royal Huisman says production is well underway for the LY-3 approved crew quarters and that the remaining accommodations comprise a master ‘apartment’ (including gym, steam room and book-lined study), two guest staterooms and a large open-plan deck salon extending to an al fresco seating and dining area on deck.

Godfrey Cray, acting as the owner’s project manager, comments: “Maximising reliability and reducing maintenance to a minimum requires balancing the needs of the client with those of the crew in order to operate the yacht efficiently and safely. To this end, the shipyard has worked closely with the owner’s team to evaluate where the systems architecture can be simplified. This involved, for example, looking at the alarm and monitoring system to minimise the number of sensors, thus eliminating the associated wiring and readouts. A case of ‘must have’ versus ‘nice to have’ has been the modus operendi.”

Details of the interior styling by Rick Baker and Paul Morgan are currently restricted.