Category: Miscellaneous

I have made progress on the bulkhead hatches.

I am using “tufnol” an early composite material of phenolic resin reinforced with cotton fibres to get edges that will put pressure on on the EPDM cell rubber gasket.

To get an overlapp I am adding 5 mm Divinycell to the bulkhead frame.

Gluing them

Now comes the outside pieces holding the gascet. Instead of gluing the EPDM I am squising it in position. That makes it very easy to replace them, if need should be at sea as EPDM is difficult to glue, but you have to work within a 0.5 mm margin to get it good. The gasket is 15×20 mm. The gap is 14.5 mm. To get that pricision I am using spacers.

Gasket in place.

The hatch fits.

Detail.

Next problem, working out a system to get enough pressure on the gasket to make the hatches waterprof.

I am quite pleased with this idea. Its fast and gives good pressure. Top view.

Side viuw. I am using a over center fastener and rollers to get even forces in the dynema rope.

To be continued…

Regards Yrvind.

This is the position of the main bulkheads.

Before epoxy them into place i will do the waterproof hatches on the bench horisontally as that is much eaysier.

To be continued…

Regards Yrvind

The bulkheads are now laminated. The core is Divinycell H80 30 mm thick 450 gram glass on each side in NM-epoxy. They are marked ready to be cut. Photo below.

To be continued…

Regards Yrvind.

After a few days of tweaking the layout is now OK. It has been a balance of how much room each compartment should have.

I decreased the size of the doors to 45×40 centimeter wich is ample. The bed will be 3 cm narrower and the stowage to port 3 cm bigger.

Some numbers.

The seat:

By having my legs through the door into the bedroom I gained a lot of space.

The deckhouse will cover my head.

The bed is 1.9 meter long and 70 centimeter wide, much bigger than the bed in “Yrvind.com” the yeallow boat. Plenty of space.

Passing through the door to the front room from where sail handling and adjusting the leeboards will be done.

In the front room.

After closing the waterproof hatch to the sleeping room I open the deckhatch. In this position I can handle sails and leeboards.

Some people say the lenght of your yacht should correspond to the your age.

Thats is: Ten year old your boat should be ten feet

15 year old your boat should be 15 feet

30 year your boat 30 feet

40 year your boat 40 feet

50 year your boat 50 feet

60 year your boat 60 feet

Well thats certainly is a good formula for comfort, but comfort makes you lazy, fat and bored. Comfort gives a short life.

Better be active and happy in a small boat. It is also better for the enviroment.

To be continued…

Regards Yrvind

Ex Lex is now laminated on the inside and i have started the delicate compromise of of dividing the space. There is a bedroom in the middle and in front of that a waterproof bulkhead with a door leading to a foreward compartment where from a hatch I can handle the sails and leeboards.

Behind the bedroom is a similar arrangement. From that hatch I will scull the boat and do a bit of observations and enjoy nature.

The hole in the foreward compartment seams to be more than ample. I probably reduce its size.

So far thing are working very well.

Tomorrow I cut the hole in the back bulkhead.

To be continued…

Regards Yrvind.

Ex Lex is now lifted off the moulds.

Below are some pictures.

Knocking down the front mould.

Lifting her

Stern viuw.

First look inside

First time inside

4.48 long with a beam of 1.04 and a high prismatic she should give me enough space and at the same time be easy to handle.

To be continued…

Regards Yrvind.

The bronze plate is there to protect the boat when beach landing and act as ballast to give stability.

Phosphor bronze has excellent wear resistance and corrosion resistance. Their spring qualities are also fatigue resistance very good.

I believe in belt and suspenders so in addition to gluing I have screwed the plates with silicon bronze screws. I do not like to use stainless steel below the waterline.

Silicon bronze is just a bit nobler than phosphor bronze and that is as it should be because their surface is smaller.

The scarifying metal will be the phosphor bronze.

Below, part of the galvanic series:

Graphite

Palladium

Platinum

Gold

Silver

Titanium

Stainless steel 316 (passive)

Stainless Steel 304 (passive)

Silicon bronze

Stainless Steel 316 (active)

Monel 400

Phosphor bronze

Admiralty brass

Cupronickel

Molybdenum

Red brass

Brass plating

Yellow brass

Naval brass 464

The screws are set in NM-epoxy. When drilling the holes I pendeled the the drill creating a conical hollow in the Divinycell below the plate and glassfibre into that hollow i injected epoxy.

To be continued…

Regards Yrvind.

To protect Ex Lex bottom and increase her stability I am adding two 4 mm thick phosphor bronze plates. Together they are 2 meter by 0,6. The high cupper content makes them antifouling.

Thomas and me checking if they can take the bottom curve.

Petter is helping to glue them.

The bronze surface is prepared by wetsanding it in NM-epoxy to make sure no oxygen will oxidise the surface.

In addition to gluing they will when the glue have set be scruwed.

To be continued…

Regards Yrvind

The outside of Yrvind Ex Lex hull is now succesfully laminated. She got twelve layers of 450 gram glassfiber in the bottom for beachlanding in NM 275 epoxy.

The hullsides got 2 layers. The last layer is peelply.

From left to right Jonas, Thomas, Matthias, Oskar, Maya, me i the foreground. Petter and Jerker are hiding.

To be continued…

Regards Yrvind.

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