Bolted-on buoyant and faired extensions. 2003 New Zealand used a ”hula” a hull buoyant appendix on their Am Cup boat. It was protested against, but found legal. It was not bolted on but just attached in the very middle of the boat leaving a 5 mm gap to the real hull.

They where of course rule cheating but that’s legal, so would my Bolted-on buoyant and faired extensions be. I think it is the duty of a competitor to try to find loopholes.

Big company’s find loopholes and pay no tax.

When I started with the Around in Ten I had not studied the legal aspects of the race. Rudders are buoyant extensions not measured, so are hulas but all this is no fun. It leads to unhealthy boats. Yrvind Ten would in reality be legally about four meters long with the extension and I do not think I would be proud of cheating, therefore I decided to build a smaller boat.

Regards Yrvind


Some people mind that I have changed my mind, but only idiots never change their minds. It is me who is going to do the sailing I therefore have the right to change my mind.

The note belov have been hanging on my wall for over a year.

The hull of the new boat is extremely easy to build. I know that the hull is the quickest part but I built a few other boats so I have something to compare with.

One side of the hull is already covered with 4 cm thick Divinycell.

To be continued…

Regards Yrvind


I have now started to work on the Divinycell. Below is a picture where I glue two sheets together. As clamps I am using rigging screws and Dynema rope.

Below is some pictures of the modell rigged for differnet wind conditions. First from the side with the wind aft.

The above picture shows the unstayed masts. They are leaning 14 degrees outboard. In heavy weather I will use the windward one and one sail. The mast then contributes to stability.

The total lenght of the masts are about 2.4 meters and less heavy than an oar and can easily be moved arond.

In real strong vinds I will use a short mast 1.2 meter long 0.9 meter above deck and a reefed sail.

This boat is much smaller than Yrvind Ten. Only a third of its displacement, 500 kilos with food and water ready for a long high altitude passage. I have lost interest in Around in Ten.

The boat I call her Yrvind XLX .5 is 4.6 meter long. The outside beam is 1.04 meter, the inside beam 0.96 centimeter. Headroom below deck is 0.7 meter. XLX stands for Ex Lex meaning without law, with the European Small Craft Directive in mind .5 means half a metric ton = 500 kilo.

Wheight is a better measure of size as it is more difficult to cheat with it.

To be continued…

Regards Yrvind.


Belov is the table of offsets for Yrvind XLX. I have used the offsets for Boat Ideal 5.4 meter long and 1.4 beam and reduced her to 4.05 long by 1.05 beam.

The table is extremely simple as al frames are rectangular only height and half beam are given. For deck beam I use a parabola.

Belov are some point on the parabola. The fractions are squred. the crown is 10 cm.

Below are some of the frames.

They are closer spaced forward. The Divinycell is 4 cm thick therefore the outside will after being shaped have a compound curavture.

To be continued…

Regards Yrvind.



My appendix is already gone so in preparation for my coming long voyage it was only logical to pull out all my teeth except the front ones, which I think, in an emergency, I can handle myself. It took some convincing before the dentist was willing to do it. After one and a half hour I left the office bleeding in all the four corners of my moth.

When the anesthetic stopped I was not so shore that I had been so smart. During the first three weeks the pain kept me awake. To keep my mind occupied I started to write on a book: A dyslectics venturesome voyage. The manuscript is now sent to a publisher

For four months I have been writing twelve hours a day. During all that time I did not go to my workshop.

When I was out running, when I was eating and before falling asleep I did however think of Yrvind Ten finding out new smart thing and reflecting on the ones already done.

As Clausewitz pointed out, few plans survive the first contact with the enemy. I realized that all might not work as smoothly as I have envisaged. I have therefore decided to test the rig, the rudders and the new steering arrangement among other things and having some fun at the same time and acquire the necessary seamanship to proper handle the equipment.

To enable me to do that I will build a 3/4 version on the same lines as the 5,4 meter Boat Ideal. She will be a quarter of Yrvind Tens displacement


Lenght 4.05 m or 13 feet 3 inches

Beam 1.05 m  or 3 feet 5 inches

Draft 19 cm  or 7 inches

Sail area 8 sq meter or 86 sq ft.

Displacement 422 Kilo or 930 pounds.


My rough weather hatch will be in fore end of the boat next to the side by side masts. There I will handle the sails. Going to windward that’s the wettest part of the boat. Therefore I will be running as I am used to. Now with twin rudders that I can individually adjust I can angle them outward creating a variable breaking force that will keep the transom to windward. Adjusting the rudders is done by a rope running the periphery inside the hull.

To avoid water and dampness enter the inside the ropes passes through the hull via cylinders. The part of the rope that is inside the cylinder will have piston rings or rather rubber washers to keep the water on the outside.

There is an aft hatch in bedroom. Normally it will not be opened in rough weather because if the bedding gets wet with salt water it will not dry. To overcome that disadvantage I am planning to learn to sleep without a matrass, then I can just toss my sleeping bag in a locker and no harm will be done if water enters. I will see if the years has made me soft.

I do not know what kind of problems that will pop up, therefore the testing.

What does XLX stand for? If a bureaucrat asks I will say Extra Large Experimental, if a friend asks I will say that it is Medieval Latin meaning, ex lex, bound by no law. I think an experimental boat deserves a bit of freedom early in her life.

The mast stands side by side. She has leeboards and twin rudders. She is built of 40 mm Divinycell laminated with NM-epoxy.

Below are some illustrations.

Above are the sections. The rounded lines are outside, the straight lines are lines from the inside of the hull.

Becouse the Divinycell is 40 mm thick I can shape her before laminating, thus getting a softchine hull on the outside and a hardchine one the inside. Where I take away to muck material I will compensate by gluing wedges on the inside.

The Divinycell gives flotation and insulation.

To be continued…

Regards Yrvind.