May 25, 2014


What you desire is a question of taste. Production boats are not to our taste. We like a boat that is small cheap and functional, have shallow draft, can be propelled by wind, wave and muscle power, a boat that can ride out any storm at sea and at the same time protect you from the weather, a boat that is directional stable upwind and downwind so that it do not need your attention.

This long and narrow boat meets these demands. Pierre’s boat is 5,6 meter long with a displacement of 778 kilos, my is stretched to 5,8 meter and have a displacement of 806 kilos. They have the same square midsection and a prismatic of 0,723. The draft is tolerable 19 cm or 7,5 inches.

The boats have balancing lugsails. There are two pivoting side-by-side mast and leeboards. The mast and leeboards pivot on the same axis. Because the section is square the leeboards will lay flat against the hull. Because the boats are small, they will attract small forces. The same mast and leeboard arrangement will not work on a bigger boat ( Galileo’s square-cube-law ).
This is the beginning of a project and as yacht design is an iterating process many changes will be made. Only the imbecilely never changes their mind.

One reason I like you to know this is that so that you will not think that my Yrvind Ten is a good cruising boat. She is twice as heavy has twice the draft and half the speed. Yrvind Ten is made to set a world record. She will be good at that and give me a unforgettable time at sea far from land.

Below are some pictures.

Pierre and me putting the modell together.

Abouve: Viuw  from below.

Above: Pierre inside the boat. The inside measurment is 1 meter. All that space comes from the square section.

Regards Yrvind.

May 18, 2014


After we had found a good way to do the book, Pierre, Maelle his girlfriend and me drove back to Sweden. Here I gave Pierre more material for the book. Pierre liked my boating concept so we decided to do a design that he could build; a design that also would suit my future needs.

Restricting a boat to ten feet is only good for records. I believe a boat should be long narrow and have shallow draft so my next one will be 7.2 meter long 1.1 meter beam with a draft less than 0.2 meter, displacement one ton, displacement lenght ratio 80 compared to yrvind tens 2500 . Pierre’s will have the same midsection but will be 5.6 meter long and have proportionally smaller displacement .

More about this is to follow – of course I will continue to work on Yrvind ten – just made some important improvement on the rigging.

More will follow.

Above me and Pierre at the mock-up of the midsection.

Above: Me and Pierre looking at the coordinates from a rhinofile of the hull a friend has done.

Above: Me and Pierre busy plotting out the coordinates for hulls; scale one to ten of the new boats.

Regards Yrvind.

May 2, 2014


I am now in Landevennec, Finistere, Bretagne, France. The reason; I have found an illustrator for my new book which I try to get published in english and french. His name is Pierre Hervé, a well known nautical illustrator.

For those interested in his work, please visit his website:

Now we just have to keep working and find translators.

Regards Yrvind.

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