Walkthrough and Designers comments
One of the main aims of this new design was to produce a boat of outstanding comfort and living accommodation space, with as little sacrifice as possible to the excellent sailing performance, windward ability, and seakeeping qualities of this well proven type of hull form.
Apart from the great benefits that can be derived from flaring the hull above the waterline, in terms of keeping the bow up on a reach, the flare gives a massive increase in interior volume without increasing the windage of the hulls at all. For instance, above the waterline the hull flares outwards to give a maximum beam at eye level of 1.95m (6'4"), the impression of space is tremendous and cannot possibly be matched by any similar length catamaran whose topsides rise almost parallel from the waterline.
Construction and Long Term Fatigue
By using integrated structural techniques the hull weight can be carefully controlled and the net effect is a strong, light displacement hull with a high long term fatigue life. Integrated Structure is a computer aided design method which I originally developed for the highly stressed ocean racers of the North Atlantic circuit . The structure of the boat is designed in a similar way to a sail where highly loaded areas like reef points and clew are patched out into the lighter body of the sail, the layers of cloth increasing from the lighter body of the sail out towards the clew or reef cringle. (ref 7). On a wood epoxy design this is achieved by laying unidirectional fibres along the line of greatest stress in highly loaded areas, and spreading the fibres into the body of the hull or deck until the stress is distributed over a large enough area to ensure that structural failure of the boat itself is virtually impossible. Fibre quantities are carefully calculated to avoid any stress build up in the structure at vulnerable points, thereby increasing the fatigue life of the boat dramatically.
In the past it was not unusual to find a bridgedeck saloon type Cruising Catamaran which would tack through 100 degrees or more. This poor pointing ability is caused by the combined effect of heavy displacement, inefficient under water foils, small sail area, and poor attention being paid to windage and the streamlining of hull shapes in the air.
By keeping the boat light (through Integrated Structure), by using efficiently shaped daggerboards and rudders, and by minimising the aerodynamic drag - i.e. designing the bridgedeck and hulls to be as streamlined as possible, the Shuttle 32 will have excellent windward performance. Bearing in mind that a sailing boat must be streamlined with the air flowing across the deck at 30 degrees to the bow, because that is the direction the that the wind actually flows across the boat when she is sailing to windward. All the other existing designs in the range have already proven themselves to be outstanding windward boats, tacking through 80 degrees at maximum Vmg, and outsailing all but the stripped out racing multihull machines, on all points of sail.
A wing mast has been chosen as the standard rig A wing provides a very efficient and simple rig, which can be home built. The high aspect jib is self tacking, which means no winching or flogging lines when coming about. Fantastic for cruising! The mast size is designed so that the mast itself becomes the storm sail.
A single outboard is mounted in the centre of the cockpit. and when retracted there are no propellers in the water to cause unwanted drag, and no holes through the hull. In the cockpit the box doubles as a table.
The Accommodation is straightforward and spacious, with the saloon aft in the port hull. 2m (6'7") long and 2.3m (7'6") wide at eye level. The flare in the hull makes this a very spacious and comfortable social area. Forward of the saloon is the 1.9m (6') long galley with ample space for storage and food preparation. The single daggerboard, with our special kick up system, is unobtrusively canted towards the hull side at the ford end of the galley. In the bow is a forward stateroom with a large double bunk. 2m ( '7") x 1.35m (4'6").The starboard hull aft has a very big double berth 2m (6'7") x 1.6m (5'4"), with good locker space and standing area for dressing. Next is a fair sized chart table, and oilskin locker with a separate W.C. / shower area. The forward area is the same as the port hull.
Forward and separate of the berth in each hull is a wet locker accessed from the deck.
Reefing and raising/lowering of sails is carried out while standing by the mast...........
A 3/4 stratoglass enclosure and full T-top protects the cockpit from spray and rain.
A full length tiller bar gives the helmsman considerable choice of where to sit.
Visibility of the sails and forward is very good, which will increase the enjoyment of sailing this exciting performance cruiser.