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July 29, 2015

A SIMPLE EXPERIMENT

The forepeak arrangement has after mockup been modified slightly. The water containers are now arranged longitudinal instead of athwartships. It was a bit cramped before. This gives me more space to move around. Now it is comfortable. The price is now there is 4 instead of 5 plastic cans. I can live whith that.

The original idea was that this boat Ex Lex 3/4 version of the 5,4 meter Boat Ideal was to be a test boat. However as I grow into her I realize that she probably have enough space and displacement for my things and me. If I use 2100 calories a day and bring food with an average calories density of 300 calories per hundred grams 168 kilos will give me 8 months of food.

Back to the forepeak. The anchors have obviously to be lashed down. The question was how strong would a fastening be. For a test I screwed a screw into H80 Divinycell through 450 gram glassfibre.  Into the drilled hole I put some glassfibre flock and injected NM-epoxy.

I found it was good for 6 14 kilos lead weights. Surely strong enough for my two anchors 6 and 15 kilos especially as Ex Lex is made of Divinycell H100 which is much stronger. There will also be more layers of laminate. I am going to use several screws as well. I hope to be able to do a more serious test later.

Below same pictures.

The anchors and the water containers.

The strained screw.

The load. Six 14 kilos weights. 84 kilos.

More water next to the bed. This gives me 8 cans each can be filled with 5.5 liter.

I will also have six one liter bottles, the ones in the bed. Total 51 liters. I use less than one liter a day. A good rain catch system will replentish my supply.

Next to the water there will be place for two Sonnenschein gelbatteries each 40 Ah.

More stowage below the aft deck.

The stowage to the right at the top of the picture is my lunch box.

All these compartments will have there individual waterproof hatches.

This arrangement divides the boat up into a good number of compartments making her strong and safe.

To be continued…

Regards Yrvind.




July 17, 2015

AN IDEA BORROWED FROM THE OLD EGYPTIANS.

Archeologists where surprised to find that the four corners of the great pyramids where level to within a few millimeters.

Later they found out that the ancients had digged a channel around the pyramids and filled it with water. What could be more precise?

When making waterproof hatches its important that level surfaces matches level surfaces otherwise the gasket cannot take up the play.

To achive a level surface blow the gasket I poured a few millimeter epoxy into the channel. See picture.

The other surface, that on the hatch. I ground it flat on a big flat surface. It was sandpaper on particleboard. Particleboard is very flat. I had found a roll of sandpaper on a flea market. The roll was five feet vide. It cost me 2 ‚ā¨. See picture.

Below the sandpaper on particleboard. The hatch being grinded.

I will have a gallow to lean against and hold into. It will also serve as the aft end of the awning/water catchment system.

Pictures below.

from the back.

The watercatchment on the model.

To bee continued…

Regards Yrvind.




July 12, 2015

CONTROLLING EX LEX

Production boats are optimized for windward work. Therefore they have weather helm. Cruising boats spend a lot of their time going downwind. A trade wind passage or a voyage in high latitude west wind belts in a boat that has weather helm is not optimal. I designed Ex Lex with leeboard so that I can get lee helm by lifting them up. Leeboards leave the boats bottom nice and clean, no centerboard case that creates turbulence. There is no better lateral arrangement than leeboard for going downwind.

External forces tend to deviate at boat from its course. The winds strength and direction keeps changing therefore the sailor has to adjust sail area and rudder angle. That work often exposes the sailor to the elements at awkward times.

To make it easier for me I have a dry and cozy sleeping room in the middle of my yacht enclosed by waterproof bulkheads. At either end there is a control area.

In the back a deckhouse, the forward end a smaller deckhouse. My boat is divided into three parts. From everywhere I like to adjust the rudders therefore the tiller lines run a circuit around the boat. The top line for the starboard rudder the bottom line for the port rudder.

The rudders can be moved independently of each other. To move both rudders I grab both lines.

If I like to slow down the boat, for example running before a gale or handling sails I move their aft end out letting them form a V. I light wind I tilt the windward rudder up to reduce resistance.

The tiller lines comes into the boat through a pipe under the aft deck. The line is sealed with piston cups that no water may enter the boat that way. To keep the pipe and tiller short a block and tackle is used.

Handling the rigging and leeboard is done from the forward hatch going downwind even if my destination is to windward; the reason less water is coming onboard.

To orient myself to the sea there are some small oval windows, 15×6 cm, in the forward deckhouse.

I like to be able to adjust the sheets from either deckhouse. To make me able to do that the sheet is in an endless loop with three attachment points, the sail and the two deckhouses.

The masts are short 1.8 meter and 2.3 meter above deck. In strong winds I dowse the big sail and place it and the mast on deck.

The masts are side by side. Using one mast on the lee side makes the boat more weatherly. Using one mast on the windward side gives lee helm.

Running with two sails wing a wing the sails can be let out more than 90 degrees making at very stable configuration. Balanced lugsails are only attached to the mast at the top and they do not need a boom vang as the dawn haul is aft the fore end of the boom.

The rudders are attached to the bathing platform that extends the waterline and gives the rudders more momentum.

Below are a few photos to illustrate my text.

The endless loop runs thrugh a single block in the boom, a dubble block on the deck – the sheeting point then on end runs forward to a cleat at the forward deckhaus, the other part back to another cleat at the big deckhous. Then the loop connects the cleats.

The loop seen from the aft deckhouse.

The loop seen from the forward deckhouse.

The loop seen from the port side

Last picture of the loop. I hope you get the idea.

Above the principal of the inside loop that goes all around the boat. A singel block at each side does the gearing. Rope jammers – not shown – will fix the rudders in the desired position. I will give enough friction in the system that the rudders do not easily move without my intention even when the jammers are released, when I move from one position to an other.

The rudders. The control lines goes into pipes under the aft deck, not shown here. The are sealed with leather cups to keep out water. The boarding ladder is in the water.

The rudders in the braking position to be used as a drouge.

In the above picture the two deckhouses can be seen. The small windows on the forward deckhous are indicated.

Above the forward deckhous in full scale. The windows gives me an excellent vieuw allowing me to orient the boat nicely before open the hatch. Saving me from useless bailing.

To be continued…

Regards Yrvind.




July 7, 2015

BUREAUCRATS AGAIN

I have received a box with spear guns from Dan Berg. As Ex Lex is so small I can only store food for about 8 months. I intend to use them if I run out of food.

The Swedish bureaucrats have given me many problems about it.

Unlike the other Nordic country’s Norway, Denmark and Finland spear guns are forbidden here. I wonder why.

I have asked the related authority’s to get a permission to carry a spear gun as a survival tool.

‚ÄúNo way‚ÄĚ, they say.

Finally I found a police recommendation from 1986 that said that small spear guns 50 cm, were OK. I like small things and I am aiming for small fish.

Below is the forepeak arrangement.

One Spade anchor 15 kilo for extreme storm use one 6 kilo for normal use.

6 plastic cans for water. Each holds 5,5 liters. There are 4 more elsewhere. I will also have 7 one liter bottles for dayly use. Over the years I found that I use rather less than one liter a day. Therefore whith no problems I can go two months between rains.

The main bulkheads are now attached. A taped fillet on each side and epoxy injected between should make a strong and precise connection.

I use a syringe connected to a cupperpipe to inject into a grove.

The Growe .

The bulkheads are made from 3 cm thick H 80 divinycell.

With the help of a piece of plywood the table saw cuts the grouwe at an angle making the grouve wider.

To be continued…

Regards Yrvind.

When I happily told my friend Björn, who knows about laws about he said:

‚ÄúThat was 1986, what about today‚ÄĚ He checked and it was OK.

I intend to have one in the forward hatch and one in the aft hatch and one spare gun with some spare parts.




July 1, 2015

ABOUT HATCHES

My hatches slide, but not on tracks, they are guided by strings. Over the years I have tried many different variations. Sliding and hinged hatches each have advantages and disadvantages. One disadvantages with hinged ones is that they collect spray and when you close them you get a salt-water shower if you do not close them very slowly.

An other disadvantage with hinged hatches is that they cannot be dogged on the hinge side. To get pressure there from the leverage from the hatch the gasket has to be of the correct size. An old gasket may not keep out the water. To overcome that difficulty, on Amphibie-Bris I made the hinges sliding up and down. On Al-Bris with a sliding hatch the slides could move up and down.

On the yellow boat 2011 I let the hatch be guided by strings. It worked very well. Now the hatch could slide forewards to open and there was enough play in the strings to let the tensioners mowe it down against the gasket with enough pressure al around. I will use that solution on Ex-Lex.

Having waterproof hatches is not a question of life and death. It is about peace of mind, of always being dry, warm and snug.

Below are some pictures illustrating my ideas.

The mock up of yellow boat. Hatch closed.

Below hatch open. The guiding strings can be seen.

Hatch of yellow boat, closed and locked.

Me in hatch i Poerto Santo 2011. Hat in hand shoes on hatch and landry in rigging.

Below open hatch in a calm tradewind crossing. I like this kind of hatches.

The little rope coming out of the hatch is my life-line. I always put it on before going on deck even in calm weather like this.

One time I had an American girl as crew. She had read Lin and Larry Pardey who said you need only lifeline in heavy weather. However I was the Captain. She wanted to learn, so one time she was in nice weather on the foredeck changing the wisker poole. When she pulled a string it let go of the jib. To her surprise it let go of the mast at the same time. Instantly she was in the water. It was rather cold becouse we vere near the Falkland Islands had just left them a few days before. I fished her up undressed and dryed her before letting her into the cabin. I do not like salt water inside my boats.

Later she willingly wore a lifeline.

The mainsail boom is let out about 120 degrees making the boat directional stable and reducing risk of gibe. The shrouds are tied on to the chainplates with knots making it easy to mowe them.

Below tensioners for Ex Lex hatches. There are two deckhatches, two bulkhead hatches and two storage hatches. The deckhatches need two tensioners each. By using Dynema-strings the tensioners can be a distance away from the hatch. That way there is no chafe.

The bulkhead hatches are also sliding guided by ropes. Unlike a Japaneese door, as they slide they also twist 90 degrees as boat is very narrow. I have found a neat solution for that. More aboat that later.

To be contiued…

Regards Yrvind




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