Power catamaran · centre console
Six metres, a flush deck with no sills from bow to transom, and 2.44 m of beam — inside the European road limit and inside the stricter German one.
01The boat
STINGFIN 6 is a 6.3-metre welded aluminium catamaran — two hard-chine demihulls joined by a bridgedeck, carrying a flush working deck that runs from transom to bow with no sills at all. The engine sits on the centreline, which leaves both sides of the boat free.
A monohull of this length cannot offer that deck. It is the reason the boat exists: room to work, fish or dive on a hull short enough to keep at home.
Between the hulls the tunnel roof is veed rather than flat. A flat roof sat below the full-load waterline across its whole width, so the wet deck slammed at rest; raising the apex 200 mm puts it 128 mm clear of the water and squeezes the crest of the tunnel wave sideways up the vee instead of meeting it head-on. The flats still run under the waterline and are designed as bottom, which is what the geometry requires.
At 2 440 mm she sits inside the 2 550 mm European road limit and inside the stricter German 2 500 mm, with no oversize permit. She is designed to CE Category C for four people on a single 150 hp outboard, with the transom and the engine foundation rated for 200 hp as standard.
Every figure on this page is computed from the hull geometry measured off the 3D model, not scaled from a similar boat. What is calculated rather than measured is marked as such.
02What defines her
A continuous working deck across the bridgedeck and both demihulls, walkable on both sides, with the engine on the centreline instead of in the way. No step down into a cockpit anywhere. Sealed lockers in the demihulls, bottom damping and closed-cell foam under the decking.
CNC-cut and folded to the ORIGAMI geometry, then welded: 4 mm bottom in 5083, 3 mm topsides in 5086, 4 mm deck, 3 mm on the veed tunnel roof, which is designed as bottom. The folded panel carries a 5.02 mm skin on a 200 mm rib pitch against the 3.6 mm the standard asks for at the 28 kn design point — a margin of 1.4. No fairing and no paint above the waterline; epoxy primer and antifouling below.
2 440 mm of beam against a 2 550 mm limit, and inside the stricter German 2 500 mm. Boat and trailer make a combination near 4.5 tonnes, which needs a twin-axle braked trailer from 2 800 kg, a tow vehicle rated for 2 600 kg or more and a category BE licence — but no oversize permit and no escort.
03Renders
04Drawings
05Standard specification
Everything here is included in the base boat.
06Options
The base boat is lean on purpose. Options are quoted on request.
07Build & certification
STINGFIN 6 is built at the Stingray yard in Burgas, Bulgaria. Scantlings are calculated to EN ISO 12215-5 on as-welded material properties at the 2 219 kg design mass, with the chine beam and the deadrise measured from the hull model rather than assumed, and the option speeds checked as design speeds in their own right. For a category C craft of this hull length the Recreational Craft Directive allows Module A — internal production control, with no notified body — provided the harmonised standards are applied, and that is the route. The technical file, the declaration of conformity, the craft identification number, the builder’s plate and the inclining experiment all belong to hull no. 1.
Speed, range and stability are calculated, not measured. The demihulls are slender and run semi-planing, so the Savitsky prediction is applied at the edge of its validity and interference between the hulls is neglected: every performance figure is a design basis to be confirmed on sea trials. The weight book lands about 9 % below the 2 219 kg design mass; the design mass is what the structure and the stability are calculated to, and the gap closes when the first hull is weighed. Figures here are taken from the STINGFIN 6 full specification, Rev E of 5 September 2026, and supersede earlier published data — in particular a beam of 2.50 m and a fuel capacity of 2 × 60 L. The renders and the general-arrangement drawing predate the design decisions of 3 and 4 September and show the earlier tunnel roof and the pre-correction chine beam; where they differ, the figures on this page govern. The hull graphic in the renders is decorative — the base boat is bare satin aluminium.
Every hull here is cut and folded to the ORIGAMI geometry and welded at our yard on the Black Sea. Tell us what you need and we will answer with drawings, not a brochure.