CNC Kits for 47ft Plywood Catamaran

There is a tremendous amount of work involved in preparing CNC cutting files for a big boat. When the boat is a catamaran, that preparatory work increases due to the two hulls and bridgedeck structures. A few people have asked about CNC kits for the DH550 catamaran. I have done panel files for the bulkheads but not for the remainder of the boat. That allows bulkheads to be cut by our normal plywood kit suppliers in various countries around the world. You can see the list of plywood kit suppliers on our kits page. For all other panels of the big cat the builder must develop the correct panel shapes by the normal boatbuilding methods then cut them from sheets of plywood.

Until now, this has also been the case for the smaller sister, the Dix 470. However, that is changing. A new company has been formed in UK to supply CNC kits for the Dix 470, available to both amateur and professional boatbuilders. Exocetus Yacht Kits has developed the cutting files in-house and is building the first boat. This gives them the hands-on experience to fully back up builders who choose to buy their kits. If a builder has a problem with any aspect of the construction, Exocetus will have already dealt with that issue and be able to answer the question.

Parts of a bulkhead ready for gluing.

The Exocetus kits use stepped scarph joints to join the parts of each panel, with the joints laid out to a saw-tooth pattern to add strength. This joint pattern can be seen in the photo above. People who build her as a one-off without a kit would do a conventional straight sloping scarph instead of this stepped sawtooth scarph.

Exocetus is keeping a complete photographic record of their build project on-line, which gives an excellent resource for builders to use for reference, as well as for potential builders to see what is involved in building one of these boats. The photo diaries can be accessed at the Dix 47 Catamaran Project .

They are developing various kits for the Dix 470, so that a builder can buy what is needed for the next stage of his construction or to suit his needs.

Stern steps, built from pre-cut components.

For information on this and our other designs and kits, please visit http://dixdesign.com.

Mast Raising for Trailer-Sailers

Trailer-sailers are great boats for those who don't want a bigger boat or don't have the funds needed to own a bigger boat and keep it on a permanent mooring or marina. They can be taken home or to a storage facility when not being used, to reduce ownership cost. Their size allows them to be used as a short-term cruiser for a small family, for weekend or holiday cruises of a week or two. They are also capable of getting you into all sorts of nooks and beautiful little spots that are inaccessible to larger boats. This can be great to get away from the crowds in some locations or for just getting you right up to the beach, to almost step ashore onto dry sand.

Cape Cutter 19 "Zest" tucked into a small spot that

is out of reach to bigger boats.

Cape Cutter 19 "Kaliope" taking a party break from

the tough duty of cruising the Greek Islands.

Launch and retrieval, with their associated activities of preparing the boat and raising or lowering the mast, are relatively simple when there are enough hands to help with doing the actual muscle work and ensuring that rigging wires, halliards etc are not hooking around the trailer, rudder or other obstacles. It is when this is all being done by one person that it can become rather challenging and it becomes very necessary to have your boat well prepared for the operation.

There are various ways to do this with hinged mast steps or tabernacles in combination with spinnaker poles, folding bowsprits and bipods, with varying degrees of effectiveness. The biggest problem is normally ensuring that there is decent lateral support for the mast as it goes up, to stop it from going off centreline and damaging something.

The bigger the boat and the taller the rig, the more important it becomes to have a well thought-out system to raise and lower the mast without a host of people to help. Another factor is how far out of alignment the mast hinge position is from the chainplates. The Cape Cutter 19s shown above have a short mast, folding bowsprit and tabernacle on a flush deck, so it is fairly easy as long as the many ropes and wires don't hook on anything. The Didi 26 shown below has a hinged mast step (less stable than a tabernacle) and taller mast stepped on top of a high cabin, so it will not be easy to do it by yourself without a decent system.

Didi 26 "Butterfly" tied to a tree in the Swedish

Baltic Islands.

A few days ago I read an article about a system that seems to have sorted out all of the normal problems. The best solutions are normally developed out of necessity, which is the case here. The owner of the boat has a mooring that is up-stream from a low bridge, which means raising his mast after passing under the bridge every time he wants to sail and lowering it before the bridge when returning to moorings.

My thanks the staff at  Tropical Boating for taking the trouble to write a clearly illustrated article about a solo mast raising/lowering system that can be adapted to most trailer-sailers.

See out full range of designs at http://dixdesign.com/ .

More Sneak Preview

A few months ago I blogged a Sneak Preview of a new design that was developing in North Carolina. That boat will not be ready for the Wooden Boat Show in Mystic Seaport later this month as expected but it is progressing. It should be there next year.

Yesterday I received the latest photos from the owner builder, taken this past weekend. When you look at them, please bear in mind that this man is an amateur boatbuilder and this is his first ever boatbuilding project. He has been a very hesitant builder, unsure of his own woodworking skills being up to the task that he had taken on. He has occasionally needed my reassurance to guide him in the right direction or confirmation that he is doing something correctly. He has shown himself to be a meticulous craftsman, working to a higher degree of accuracy than I have in any of my boatbuilding projects.

Click on the photos to enlarge.

He has chosen to stain the colour onto the plywood and to use clear finishes. His aim was to allow the grain to show through, highlighting the fact that it is a wooden boat as well as the details of the construction, to anyone who looks at the boat. This could have backfired badly for a careless worker because any mess-ups would be highlighted or accentuated. This level of work takes time, of course, so his progress has been slow.

As you can see, his boat is looking absolutely gorgeous. He is producing a boat that is a work of art and of which he will feel very proud, justifiably so. I look forward to sailing this boat and seeing it exhibited at Mystic in 2013.

The builder is Aussie Hunter Gall. He lives in Virginia Beach, Virginia but is building his boat at a friend's property in Elizabeth City, North Carolina.

You will not find this design on my website yet but it should be there soon. The tentative design name is the DS15, for Didi Sportboat 15. It is 4.5m (14' 9") long and 1.8m (5' 11") beam.

You can see our other designs at http://dixdesign.com/