NOTE - This site contains basic information and thumbnail pictures of all designs. If you have Adobe Acrobat Reader installed on your computer you also have FREE access to full study plans, cross-sections and side-views by clicking on the ‘click here’ links next to each design. You may also right click on the ‘click here’ and save the file to your computer. If you do not have Adobe Acrobat Reader, then visit the www.adobe.com site and download the latest version of this FREE software. For design fees and advice on construction send a request by the email at the foot of the page.
CLICK HERE for GEMMIC 750, 1050 and 1350 CRUISING CATS
CLICK HERE for GEMMIC 550 Beach Cat, GEMMIC 600 Tri and GEMMIC 800 Micro Cat
GEMMIC cruising catamarans are based on functionality, efficiency and simplicity of line. All designs are owner versions with fast passage making/extended cruising in mind; they are not suitable for charter work.
Hull shapes are easily driven with good load carrying properties while the rig size will not cause problems in extreme conditions. High clearance under the bridgedeck avoids slamming.
The knuckle, as well as enhancing the appearance, deflects rising spray, stiffens a flattish panel and increases the beam above the line.
Rudders can be either transom hung or cassette installed. In both cases this means that a repair can be carried out without the need for craning/slipping.
Anti-leeway devices can be either quadrant lifting boards or low aspect ratio fixed fins which allow beaching with inboard engines.
Twin helm positions are close to the saloon doorway giving easy communication with crew; visibility is all-round; a siliconed polycarbonate screen is velcro fixed for easy removal; the helm stations seating is comfortable; the steering wheel is at the correct angle and sheet release devices at fingertips; a folding awning on stainless tube frame ensures complete protection from the elements.
Styling is traditional rather than futuristic for longer lasting appeal.
Construction method may be either strip-plank cedar or fibre reinforced plastic (FRP) sandwich using the inside out method. This method avoids difficult access and laying up in restricted or enclosed environments. Bulkheads to be left in are laminated in FRP/foam sandwich on a plane table; temporary bulkheads are cut from low grade ply. They are then erected in position upside down. The two beams are laminated and bonded in position. Removable pre-painted thin ply formwork is secured fair face outwards and release agent, gelcoat, FRP inner skin and foam layer of varying densities is applied to the hull areas. The foam is now sanded using long boards to induce curved sections, following which ducting, duct junction boxes, piping and hard pads are let into the foam layer. The outer FRP skin is now applied, filled, faired and gel-coated. Cradles are made up and the structure is turned the right way up. The construction sequence is repeated for the side decks, cockpit and bridge-deck. The temporary bulkheads and ply formwork are then removed leaving a fair, coloured inner face with duct access covers showing. Fitting out can now begin.
Gemmic Designs tel 0(0 44)1243 641365 email email@example.com
Multihull Offshore Cruising and Racing Association (MOCRA) website mocra.org.uk