10.2m Composite Displacement Power Cat
Our first displacement hull powercat
The owner of this cat has had previous experience with small displacement power cats, actually converting an old Tornado sailing cat to a decked in power cat which was a fairly successful project, up to a point, and sowed the seed for a more serious attempt in the future.
The hull is a displacement type, 13.5 : 1 waterline beam to length ratio, very fine entry with the aft sections optimized for the outboard propulsion. A displacement hull this small could be designed to take a diesel inboard (a slender one) with the aft sections modified to be suitable for underwater props.
Light weight and simplicity are the keys to the success of this project and minimizing weight in the ends to help reduce fore and aft pitching as much as possible to keep the props in the water in rough conditions.
The layout shows 3 sleeping areas in the hulls with twin walk in double cabins fwd to port and starboard and a large single berth in the aft section of the port hull under the galley. A 2m long heads/shower compartment aft in the port hull completes the lower deck accommodation.
Up on the main deck we have the internal helm, galley, and dinning area opening aft onto the large cockpit area. Performance expected out of the outboards should be in the mid to high teens for cruising speed and a top speed of approx. 21 knots, taking advantage of the economic and quiet running 4 strokes.
Construction is all foam cored with E glass laminates and vinylester resin. The hull bottoms (below the spray chine) and the cabin top will be laminated in a female mould and the remainder of the boat will be assembled from pre-made composite panels.