LET ME EXPLAIN

Some people still do not understand how misleading it is to measure boats of different shapes by length. Let me explain. Physical objects, besides weight and inertia extend in three dimensions.

My anchor rode is 50 meter long, but I can coil it and put it in a locker in my boat so surely it is not bigger than my boat.

A scull weighs typically 14 kg and is around 8.2m long. A child can see that it’s smaller than Testas 12 foot Acrohc Australis and Spiess 10 foot Yankee Girl.

1956 Hannes Lindemann sailed a 17-foot Klepper folding kayak from the Canary Islands to St. Martin in the Carebian. His boat was 5.2 meter long, the weight was 25 kilos. With food and Hannes, 90 kilo heavy,  it displaced 300 kilos.

Testas 3.55 m boat displaced 800 kilo, Spiess 3.05 m boat 1000 kilos.

To any rational mind Lindemanns boat was the smallest.

I like to add that I think that Testa and Spiess made very interesting boats and voyages. I have read their books several times and enjoyed and learned a lot.

They did go their own way, so will I.

Regards Yrvind

YRVIND TEN WAS A STEPPING STONE

Changing course has lead people to criticize me because they think I am wasting other people’s time and money. That critic would have been fair if Yrvind Ten had lead to nothing. That is not the case. Valuable knowledge has been gained. Much progress has been made that can be used on other small boats.

Serge Testas, Acrohc Australis was not twelve feet. In the back end she had a big outboard engine and in the forward part a bowsprit. Although these things no doubt could be removed, they were permanent.

This is not against common practice, and it’s the duty of o person trying to brake records to try to stretch the rules and to find loop-holes. Tax layers do that all the time as do people involved in for example Am Cup.

I mention earlier the “Hula” that added unmeasured buoyancy to New Zeeland’s Am Cup boat. On a ten feet boat you could add huge twin buoyant rudders, then locking them making it into an twenty feet trimaran and still sail within the ten feet rule.

Hugo Vilens April Fool was not a healthy boat either. Not before he added an outboard engine could he get offshore. Gerry Spiess and Serge Testa also had to use engines. I believe a small boat should be able to manage with an oar.

I realized that if I did not bend the rule some other designer would, but when I started I did not realize how much the rules could be bend. Size cannot be determined by only length.

Living with Yrvind Ten for tree years did teach me to think small. She was a stepping-stone to a much smaller and saner boat, Yrvind Ex Lex 4.5 x 1x 0.2 meter displacing 500 kilos a third of Yrvind Ten.

I have talked this over with my sponsors and friends and they are willing to continue to support me. In fact some of them think it’s a very good idea.

Quite a few of my supporters are turning up here in Västervik Saturday 16 of May to help me to laminate the new hull.  First I will give a public illustrated talk at Bankens Dag 13:00 in Biostaden together with Captain Thomas Grahn. Everyone is welcome to the talk.

Below the 4 cm thick Divinycell core of Ex Lex ready to recive the NM-epoxy lamination.

To be continued…

Regards Yrvind

GLUING THE BOTTOM TO THE SIDES

I would not have the time to glue such a big piece singelhanded. I therefore bevelled the edges. Put the pice in position and used small vedges to glue it together.

The three following pictures hopefully explains the procedure.

From the front

from the back

To be continued…

Regards Yrvind

BOLTED-ON BUOYANT AND FAIRED EXTENSIONS

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

ABOUT RETHINKING

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

CONSTRUKTION HAS BEGUNN

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.

TABLE OF OFFSETS

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.

Yrvind 405 XLX AN EXPERIMENTAL BOAT

A PLATFORM TO TEST MY IDEAS ON

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

PARTICULARS OF THE YACHT:

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.