Bernd Kohler

I have built almost anything that can sail. At the age of 12 my first sail thing, an ice "boat". I used skates which had to be mounted on shoes as runners. Big fun, very fast, only the lake was too short. Then there where monohulls of various sizes...

The DUO 425 was the first parallel rig cat designed for amateur construction. The prototype was shown at the boat show in Duesseldorf in 1984. We have the most experience with this sort of rigs. Many very fast and record breaking catamarans used and use...

  The KD 650 is an other approach for an affordable trailer catamaran for amateur construction. The boat is designed for coastal sailing and will have a good turn of speed with its efficient Gunter rig. The boat is easy to build with...

The Gunter rig is an almost forgotten rig. This is a pity, because this rig has many merits. The Gunter rig is as good to windward as any sloop rig. The rig is very efficient. Even more than some triangle mainsails. Because the upper part of the...

Here my next small outrigger/trimaran the TINY TRI. The hull of LITTLE TRI has proven itself to be fast, easy to sail, a good boat to camp on and yes seaworthy to. My goal with Tiny Tri is a bit different. The hull is again a sharpie hull. The changes...

You can find study plans for the DUO 1000 HERE Note: There is no building guide with these plans only dxf drawings and some sketches in pdf format - these plans are for experienced builders only.The DUO 1000 is a performance catamaran for the...

The first ECOnomy cruiser was designed 2003. The first multi hull with a negative bow by the way. The model is basically the same but the experience from owners/builders around the world is flowing in in this updated model. The ECO is a perfect...

After many requests for a bigger ECOnomy cruiser here she is. For dimensions see the specifications. The layout speaks for it self. This boat is a perfect boat for the whole family. It is designed for extended coastal cruising. Construction and design:...

The ECO 75 power cat is the big brother of the ECO power cat. Designed along the same lines and with the same philosophy. Easy to build boat by an amateur. Construction is the time proven plywood/glass fiber/Epoxy composite system. Nothing can match...

These are full plans - for study plans click HERE This is our smallest offshore cruiser. A sea worthy fast cruiser catamaran for a family of four. The performance of this boat is exceptional on all courses to the wind. To make sure of this, the...

The ECO 55 power catamaran is an affordable DIY power catamaran. As the owner proved the boat is a capable coastal cruiser. The inside layout is the same as for the ECO55 sail version but the underwater shape is changed. The cockpit is wider and has a...

A new boat type? Why not? The idea, a personal multihull cruiser for the least amount of work and cost. I like Proas but I do not like shunting. It is okay for long distances but not, for instance, in a channel or river with a lot of traffic like here...