The patented hull design incorporates several innovative features:
The tunnel chines – two longitudinal steps on each side – break up the solid water to form a two phase medium before it hits the tunnel roof (wet deck). This assures a comfortable, shock-free ride in rough water.
The sponsons (demi-hulls) are a-symmetrical with convex non-trips to guarantee banking to the inside in turns. This feature provides excellent straight-line stability, as well as safe and comfortable turning. The symmetrical bows provide plenty of displacement up front to prevent any chance of ‘stuffing’ or broaching. Being symmetrical they also prevent any see-sawing (veering from port to starboard) when quartering seas.
Fitting the HYSUCAT FAST FOIL SYSTEM designed by Prof. Gunter Hoppe to the planning versions increases top speed by at least 7 to 10 knots whilst increasing comfort and stability even further in rough seas.
Where continual operation at high speed and in all weather conditions is required the BOBKATTM patented SKOKBREKER (Shock Breaker) can be fitted. This will reduce slamming against the tunnel roof in high sea states.
The high tunnel is a feature that provides several benefits. Head seas can be taken at speed; the high tunnel at the transom also allows fast backing-up without swamping the rear deck and makes trolling and loitering in following seas dry and safe.
The swim platform at the transom protects the drive system and allows recovery at near water level in safety.
Not only does the shape of the sponsons give a soft and safe ride, the shapes also provide inherent strength to the hull, reducing weight of the fibreglass lay-up.
Centre of Gravity position is not critical on this hull design which allows people to move around without upsetting stability or overall performance. Preferred position remains at 35% – 40% of waterline length, which is easily achieved in a practical layout.
Superstructures can be constructed out of GRP, sandwich, aluminium or even wood to suit the requirements of the end-user. Because of the high metacentric height of the basic hull, the deck structures can be high and wide to fully take advantage of the very large space available.