A STRONG BOTTOM

Exlex Minor will sometimes, after an ocean crossing be used as a beach landing craft. She will also be transported on trailers. This calls for a strong bottom.

To get a very strong bottom on a sandwich construction you need a tough core. Diab has supplied such a core. It has military specifications and is used for submarines among other thing. Yacht 40 – 50 -60 feet use a core of a density of about 80 kilo per cubic metre. The core I have chosen has a density of 350 kilos per cubic metre and is very strong, roughly strong in proportion to its density. Each sheet is tested.

I have now started to do the bottom.  The core is 27 mm thick. I cannot bend the sheets. They are to stiff.  Therefore I have cut them into smaller pieces and I am cross planking her bottom. That way I can give her the desired lungutudinal curvature.

Below some pictures.

Abowe: The first three cross planks.

A closer look. The circle is where the test piece has been taken. First I got angry at all those holes, but when Anders at Diab explain the purpose I got proud that such care had been taken to produce the material to my boat. No haphazard manners here.

65 centimeters of the lenght of the boats bottom has been done today.

I have also added 10 fluoerscent tube to get more light. Winter is coming. Being in a well lit workshop brings happiness.

In the bow end of the boat I have with the help of a laser marked the center.

To be continued…

Regards Yrvind.

BOW AND MASTS

I got the mast safely to the workshop yesterday. After walking a while I saddled the bike and started pedaling. It was wobbly but I mostly keept to smaller streets. When crossing heavy trafficed streets, if such are to be found here in Västervik I did it by walking.

Today I have cut down the masts to size 2.6 meters long. They weigh in at about 2.5 kilos without paint and a few small fittings. The track will be grinded away  so they will weigh about 3 kilos each when finished. That will be wery handy. They can easily be set and taken down to suit the weather conditions. The masts of late Exlex had a weight of about 5 kilos so this weight reduction will improve stability and handling a lot.

 

The bow panels seems to come together nicely. I do it bit by bit as not to crack them.

Some pictures below.

Starting the mast transport from Marström Composite factory idyllically situated at the Baltic a few hundred meters from my small flat.

One of the masts cut to 2.6 meters on the scale.

The scale reads 2656.7 grams or about 2,7 kilos

The difference between the weights of the masts is 63 grams.

There will be a third mast made from glass fibre. Glass fibre makes it possible to place the AIS/WHF antenna inside the mast. This protects the mast and an eys sore is gone.

A combination of Spanish windlasses and clamp gets the side panels gently into place. The panels are here a bit longer than the boat. The reason to get a good curvature by bending. Once the are fixed the excess material will be cut off.

To be continued…

Regards Yrvind.

NEW MASTS FROM MARSTRÖM

Taking delivery of my new masts by bike since i put my car on hold…

The masts intended for the Europe Dingy class and will be cut down to size for the balanced lug sails.

To be continued…

Regards Yrvind

 

REPORT ON PROGRESS

Today the 27 of August it is exactly one month since I came back from my voyage in Exlex. The progress of Exlex Minor is going well. Today I put on the first pieces of Divinycell on the mould. Pictures below.

The first three pictures show how I managed to bevel the bow with the help of trunnels. This is the first step in converting a hard chine boat to a boat with a spoon bow. When the Divinycell comes on more shaping will be done.

The bow from the side showing how the trunnels keep the plywood in position.

Below, one more close up of the trunnels.

The male plug is now ready to take on the Divinycell, but first I insulate it with a plastic film to prevent the Divinycell from getting glued to the plug by any epoxy leaking between the pieces.

Finally two sheets of Divinycell H 100 40 mm thick is in place.

To be continued…

Regards Yrvind

SHAPING THE BOW, THE START

I am have now started to shape the bow. Its not evident how to proceed. I am trying to bevel the edges much in the front then let it taper of towards the back. To keep the plywood together I am using trunnels or treenails set in NM-epoxy, because  it is easy to saw and grind them.

Below are some pictures. The plywood is screwed at the edges. If I remove the screws it will fall of. The trunnels are inside the screws. When the epoxy has set I can remowe the screws and bevel the edges.

Below a closer picture.

And one from the front. Click once or twice to enlarge.

The material for the trunnels comes from a flower shop. Its sticks to help the lazy flowers stand up. Flower crutches. I mean what motivates a flower to stand up once its stem has been cut. If I was a flower and a big animal came and cut me lose from my roots. I would not stand up just to please the cruel cutter.

To be continued…

Regards Yrvind.

ERECTING MOULDS

Its not going to be a plywoodboat, but I cover the moulds with plywood to in an effort to shape the bow to an compound curvature. That way I hope to be able to give Exlex a spoonbow.

Some pictures below.

The first one the bow that I try to make into a spoon shape. It is not evident how to do that but the idea is to make it in stages.

The aft part from above. More plywood pieces is on its way.

The stern.

Screw scarfing the Yrvind way.

To be continued…

Regards Yrvind.

 

VISITING FRIENDS

 

 

 

 

 

VISITING FRIENDS

As late as Sunday night 12th of August 2018 the idea was to first to build a prototype of plywood before starting on the real composite Exlex Minor. Somehow, for several reasons, very late in that night I changed my mind. The train of thoughts started with me having problems finding good marine plywood. Some people say that if encapsulate the plywood in epoxy you can use the cheapest plywood. Maybe so but the idea of using an inferior product goes against my grain. Then it was the spoon bow; with thicker Divinycell it would be easier to sculpture a nice round shape, an other reason was that the plywood version and the composite version always would be different due to different skin thicknesses 18, 12 and 9 millimeter for bottom side and deck for plywood versus 25, 40 and 20 for the Divinycell core. A third reason was I was eager to get sailing and would be more motivated if I was working on the real boat. It was a complex decision with several factors working for and against the final decision. During the night I kept tossing ideas against each other. Finally when I fell asleep Monday morning the decision was to go composite. I hope I made the right decision, time will tell.

When I woke up I phoned Anders Lindström at Diab in Laholm, the Divinycell people. Over the phone we worked out what suitable core materials where in stock.

Then I phoned Sten Fransson at Tanso in Jönköping for Carbon fibers peel ply and protecting gloves. He said I could come by. The carbon fiber will be used on the inside laminate to absorb impacts. More about that later.

Finally I phoned Gunnar Malmgren at NM-epoxy in Ytterby just outside Kungälv telling him that I was coming over to the west coast and asked if it was OK if I came by to pick up epoxy

Håkan Johansson at Mekonomen Västervik lent me a big van.

Tuesday 14 of august in the morning I started. My first stop was Tanso Jönköping. Sten took me to lunch and I explained my project and what I needed.

From Jönköping I drove from Ytterby near Kungälv where Gunnar greeted me,

then finally to Laholm. Now it was late. Being frugal I slept in the big car. My money would be better spent on the boat than on a hotel.

Early next morning Anders showed me around in the factory and helped to stove the Divinycell in the car.

On Wednesday afternoon I was back in Västervik. Håkan helped me to unload the car.

Today thuesday 16 of August I have again borrowed Håkans van now to porchase plywood and particle board for the moulds. The ones I made for the plywood version is of no use now as I will build differently. Now I can start to build in earnest.

Below Håkan and the van he lent me.

Below Sten at Tanso

The picture below is from inside the factory, showing a friendly girl tempting me with apples and a machine that works graphite.

Below Gunnar showing me around in the epoxy factory here a mixing machine.

Below a filling up machine.

Below some of the MN-epoxy for the new boat.

Below Anders showing me around in the Diab factory. The machine shown grinds the Divinycell sheets to exact thickness.

Below me and Anders and the Divinycell sheets in the van. My sleeping bag is in the blue sack between us.

I am now safely back home in Västervik working on Exlex Minor. I am thanking everyone supporting me and Exlex through Swish and Pay Pal. Please continue. Your contributions are needed.

To be continued…

Regards Yrvind.

 

MORE MOULDS AND BULKHEADS

Today I cut out the rest of the moulds and put two of them up to take the hull sides. For fun I also placed two more in an approximate position to get an 3 dimensional feeling of Exlex Minors size. She certainly is not a big boat, but thats the idea on the other hand she looks like she will be handy and easily handed.

Below a few pictures. First the frames and mould and me to give scale.

Below: One bulkhead and one mould fixed, parrallell and not twisted and in line, ready to take the hullsides.

Me, Yrvind and some bulkheads and moulds to give scale to Exlex Minor, she has 8 cm or about 3 inches more beam than Exlex. At this stage it is easy to suboptimise and give planty of beam, but give 8 cm to an contortionists doesent matter if she is a “frontbender” or “backbender” I guarantie she be out of her job in no time at all.

When I as a child told my late mother that 5 cm was not much she countered and said it was much on a nose. I think 8 cm extra beam will make a lot af difference on Exlex Minor. She will also be higher in proportion and the hatch in the main bulkhead will increase from 38X40 cm to about 60X60 that is the area will be more than twice as large. Anyway, its an experiment and the only way to find out is to try.

The setup from a distance. The modell in the foreground. The sight pleases me.

About parabolic lines, for those interested in elementary mathematics: The deck beam and sheer line and other such lines are are beutiful if they are parabolic. To find the points, for exampel on half a deck beam divide the distance into four equal parts, that gives five points. Square the distances as below and multiply by how much beam height that is desirebel. The height of any point can be found by taking the fraction to the whole and square the number. Same thing with sheerline, start with the lowest point and go forward and backwards.

To morrow we will here in Sweden have a cooler day after a summer long, killing heat wave. I have not been out running since I been back. The cramped conditions in Exlex have wasted away my leg muscles. To run in that condition whith so much heat I thought not advisible, but tomorrow is time to start.

Health is important. Therefore when I left Irland I started to eat, strictly, only one meal a day. The purpose is to limit insulin which is a poison had in big quantities. Diabetes is a bad disease, they say Alzheimer is diabetes type 3. Its no use having an fantastic boat if you are ill.

What is the value of health?

Ask an invalid person.

To be continued…

Regards Yrvind.

MOULDS AND OFFSET

I use a rather improvised method, not the most efficient, but OK and economical if you only design one boat every few years. Below waterline and up to the sheerline I use offsets from a half modell, abowe that I use a simpel analytical method parabolic for the sheerline and and deckbeam, linear for the deckprofile.

I note the measurments on a yellow paper. Becouse I use this kind of thinking not dayly, but rather seldom I often get confused and do mistakes. Fortunately this is because I am not in the habit, not because I am old. I know that because the same things happend to me in the the sixties and seventies, forty, fifty years ago, during the first days on my ocean passages when I was doing astro navigation. After a few days I get the hang of it, but then when I was back to the sextant after buildning a new boat a few years later, again the first days were confusing.

Now like then I just have to be extra careful. Sailing the ocean, the sea looks all the same, luckily making a hull its pretty obvius if you have made a mistake in the calculations because you get a shape that does not look like a good boat.

Below are some pictures. First the half modell.

The notes for station # 500 that is 500 centimeter from the back.

Below some of the bulkheads and moulds. Hopefully they make a fair surface when lined up.

To be continued…

Regards Yrvind.