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June 20, 2016

Details of “Ex Lex”

The fourth film from Cecilia and Kvarteret Filmproduktion.




June 14, 2016

The Masts

The third film from Cecilia and Kvarteret Filmproduktion.




June 7, 2016

How it works – showing on model

The second film from Cecilia and Kvarteret Filmproduktion.




May 30, 2016

The New Yolo

Cecilia was a nice beutifull smart girl I met in Brazil 1979 when I was there in Alu-Bris on my way to Cape Horn. She was only seven years old then, but now we have found each other again. She has made five little films for me. This is the first one. Se more films from Kvarteret Filmproduktion.




May 28, 2016

EXTENSION LAMINATED PART 2

Today I removed the pealplay and turned the boat over to evaluate the new set of possibilities and do some work on the inside. Meauring the boat she turned out be 5.76 meters, 18 feet and 11 inches, pretty close to 19 feet a bit longer than expected. I am pleased.

Foto 1 me with the ripped of peelply.

Photo 2, Me at the end of Ex Lex.

The extension will contain a box for more food, swim fins, snorkel and diving mask and such things. Behind the box a swim plat form that includes ground gear. Mock ups will determine it.

Also there will be a boarding ladder which foulded up and extended behind the boat will support the yuloh. Raised even more it will be an safe and comfortable place to excrete from.

Ex Lex will have twin rudders.

To be continued…

Regards Yrvind.




May 27, 2016

EXTENSION LAMINATED

Today Petter helped me to laminate the extension.

It went well.

Below are 3 photos.

Petter and me.

One more from an other angle.

Me and Ex Lex.

The boat is getting closer and closer to my “Boat Ideal” which is today 7.8 meter long by 1.3 meter beam. Ex Lex is 5.65 long by 1 meter beam.

Yacht design is an iterant process “Boat Ideal” will have the same square section. I wonder if she will go to windward without leebord or other lewaypreventing devices.

Might not the flat sides function a bit like a chinerunner now that she has a lenght/beam ration of six?

When healed over say 20 degrees she presents a lot of flat surface to lee, several square meters, many times more than other boats keels or centerboards. After all a hulls weatherliness is the ratio of her resistance to lee compared to her resistance forward. A long slender hull with flat sides has much to speak for her although a fin keel is more efficient per unit of surface the slender hull more surfaces and uses them in other ways to, like to get a very low displacement lenght ratio, say below 150 and for a given displacement a longe waterline lenght.

She will most probably not be as weatherly as a finkeelboat, but well satisfay my desires as well as give a uncomplicated shallow draft cruiser.

Also for my use, in the narrow boat I can make a much better layout.

Klick once or twice to enlarge.

I think Ex Lex will give me a good indication of how “Boat Ideal” will work.

To be continued…

Regards Yrvind.




May 14, 2016

STILL MORE WORK

Here are some more pictures of stretching the boat.

Making lids for the cut holes.

Fitting them into the holes.

Gluing on a smoth transition with Divinycell of diminishing thickness.

After a bit of gringding.

Turning the Ex Lex 90 degrees to do one of the sides. To avoid damaging the Divinycell glued on and to get the lifting point abouve the center of gravity I am using a beam. Picture 1.

Picture 2.

Picture 3.

There is plenty of space in the added section.

To be continued…

Regards Yrvind.




May 7, 2016

MORE WORK

When I stretched Ex Lex I got double planking and bottom for about 60 cm. The solution is to remove the extra inner bottom. Se pictures. Unfortunately I can only do that from the outside, but I will gain about 30 liters of stowage space and that will be worth it because those 30 liters of food might keep me alive for 2 or 3 weeks. In total I estimate that the stretching will add 250 or so liters of stowage.

As I said before Ex Lex started out as an experimental boat with two purposes, to teach me about the new rigging, leeboards and others things, also to give me a bit of fun I the summers.

Few plans survive first contact with reality. When I saw Yrvind Ten and Ex Lex next to each other I realized how ridiculous Yrvind Ten and the project was. I used my good recipro saw and a carbide tipped blade. The boat was well built, but after a busy weekend, two friends helped me to drive the pieces to the dump.

Ex Lex the new boat will have fewer problems crossing the Atlantic equator southbound due to her much longer waterline. Few if any small boats have done that crossing.

That passage is special because you meet the south east trades head on at the same time as the equatorial current carries you westwards with a speed of about one knot or 24 miles a day and than if you have not made enough southing before you hit the longitude of eastern Brazil you will be carried back up to the North Atlantic and will have to do as the square riggers of old days had to do, make a circuit of the North Atlantic before you can try again.

The southeast trade has a fetch of several thousands of miles and blows freshly. The waves you are heading into are impressive.

I have done that passage three times. Analyzing the forces acting on my boats I have come to the following finding.

I knew, and it is well known fact that a small floating artifact in big waves is subjected to a centrifugal force that is considerable. On top of the wave you are lifted, in the trough you are depressed. On top of the wave the centrifugal force is subtracted from gravity. There it’s like being on the moon, you weigh less. In the trough gravity and the centrifugal forces are added. There it’s like being on Jupiter, you weigh more.

A displacement boat can only travel as fast as its wave system and when that wave system is on top of the wave it weighs less, therefore it and the boat travels slower. The speed of a wave system depends on the forces acting on it. The speed is high if forces are high and slow if forces are small. On top of a wave where there are small forces. Therefore, there a displacement boat cannot travel as fast as on flat water or in the trough its being slowed down.

Another consequence of the boats little weight on top of a wave is that she is losing stability. She heals over, losing driving force and lateral resistance. People think this extra healing at the top of a wave is due to more wind. The fact is, its normal to lose more than half the stability due to the influence of the centrifugal force. Stability is a function of weight and weight is lost at the top of the wave.

Another complication is the surface current that on top of the wave is travelling with the wind against you. This means that three bad things oppose a small boat going to windward in big waves when trying to cross Atlantic equator from north to south.

The boats sail force is not big enough to overcome this momentarily increased resistance; therefore the boat has to borrow a lot of kinetic energy. That slows her down.

Now with Ex Lex much longer waterline I am more confident of making it across the equator. If I had tried sailing with the late Yrvind Ten my best chances would have been to hug the African coast, but there, there are pirates. Down in the Southern Ocean it’s a question of surviving storms and spending time and that is a different set of problems that I do not worry so much about.

Some pictures:

Above looking nice.

Holes are cut.

A lot of cutting, grinding and unpleasent work.

Starting the rebuild.

To be continued…

Regards Yrvind.




April 30, 2016

STRETCHING EX LEX

Progress is good and it would be nice if I could start my planned voyage to the antipode from Crookhaven Ireland end of April 2018, after first having tested her in 2017.

My first planned stop is Puerto Santo, Madeira, a distance of about 1200 miles. After that I will sail south, staying west of the Canary and Cape Verde islands. Crossing the Equator at about 20 degrees west, going south of Africa and Australia. A convenient port of ending the voyage would be Dunedin in New Zealand, that distance is about 14 000 miles at sea.

When arriving there I would be 80 years old and having accomplished the voyage would be a fine feeling.

I am getting conscious about the fact that the voyage will be more convenient if I can have more load capacity. It would make it possible to add luxuries like toilet paper, fruit and warm clothing. Also a longer boat will make less resistance and be a bit faster reducing the amount of food and toilet paper used.

The stretch will add about 1.2 meter to Ex Lex length. It will give me more storage space and a bathing platform.

I am not in the record business any more so I can build to my own design philosophy: small, but long and narrow.

I have always admired Captain Voss boat Tilikum. L. Francis Herreshof another one of my influences did likewise.

Fig 1.

Fig 2

Tilikum she started as an Indian dugout 11.6 m length, beam 1.67 draft 0.6  m sail area 21 sq meter.

Ex Lex started out as an experimental boat and still is, but she have shown her own will and my ambitions have grown.

A long narrow boat works on the same principle as the battering ram, a small frontal area and a lot of force behind it.

Resistance is mainly a matter of frontal area. I know that there is such a thing as frictional resistance but the effect of that is rather marginal especially to windward in rough seas. In heavy weather its mainly air resistance and the sea waves hitting the boat in the front that slows her down.

Displacement/Length ratio is a dimensionless number that indicates the slenderness of a boat. By stretching Ex Lex it decreases from 289 to 173 even though I have calculated with an added weight of 200 kilos, the lower that lower that number is the less friction.

In the table below one can see that for a 2 ton boat, if one increases waterline from 20 to 30 feet the needed horsepower to drive it at 6 knots decreases to less than half, from 8 horsepower to 3.6.

The table is from Philips Birth.

Fig 3 To enlarge click once or twice

I know that changing a boat in mid-building is not very rational, but after cutting up one boat I cannot afford to cut up this one to.

After New Zealand I hope to be able to start with Boat Ideal that is now 9 meter long with a beam of 1.5 meter, draft about 30 cm, strong bottom for beach landing. I keep adept it as my understanding of how I want to live my life develops.

More and more I like to spend long time at sea. I am now 77 years old and I am getting nostalgic. Life on land is no longer what it was when I was young, but at sea it is. It’s a never changing environment in which I feel at home and have control.

The average modern man does not get much natural satisfaction. A lot of artificial stimulants like TV consumption synthetic food and drugs have been introduced to satisfy him. They do not do a good job of it.

I like to live more like free animals live. The reptile brain where or feelings are has not changed for millions of years, only layers of sophistication has been added to it, nothing that makes us more happy on the contrary. Only free animals are never bored.

Physiologically all mammals are very similar, even their brains. That’s is why drug companies tests drugs on rats.

The pleasure of artificial stimulants, like TV consumption artificial food and drugs are overestimated.

Fig 4 The stretch hull.

To be continued…

Regards Yrvind.




April 28, 2016

THE MAST SUPPORT

Ex Lex masts are free standing, still they need support. The boat will have 2 or 3 mast there will be a holder in each corner of the boat in the form of a carbon fibre pipe.

Below are some pictures of how I made the tubes a two meter lenght cut down into 4 pieces each 50 cm long.

The masts are Europe Class Dingy masts cut down to size. The original sleveve where made of POM or acetal or Delrin. To me that did not have enough wear resistance.

Kindly UV-elast of Mariestad made a 1 meter long piece for me that I cut down in pieces.

After I put down the phone the man went right down to the factory and poured it. The next day I had it in my hand.

At Marström Composite 500 meter from my home here in Västervik at the Swedish east coast I am starting to build the pipe using prepreg carbon fibre.

Testing to see if the mast and the polyurethan sleeves fits in the pipe.

Putting in the inside vacuum bag.

The outside bag is on and the vacuum applied. The black butyl tejp closing the bag can be seen. There can be no leaks.

The product in the autoklav. When the door is closed 4 bar pressure is put outside the vacuumbag and the air is heated to 120 degrees celsius. After 3 houers the product is done.

Below the mast in the pipe.

There is play that it will not stick. I will put up and take down the masts as other people do their reefing.

To be continued…

Yrvind congratulates Manie to his progress. Nice choice of colour me thinks.

Yrvind thanks Angelique for the artickle on dyslexia. A French publisher is interested in my book. We are looking for a translater Swedish to French. Pierre Herve have done plenty of excellent illusstrations. God willing we might see a book one day.

Regards Yrvind




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