Welcome to Yrvind´s website: small boat designer, builder, sailor & writer
I have now two stripes of 5 cm planking all around Exlex the Canoe Cruiser. The second was a bit more easy as I had the first one as support. Also I had learnt a bit how to handle the pieces. The plywood is 2.4 meters long hence a lot of scarfing, 3 on each stripe on each side. 12 scarfing so far, but I am learning. It goes better and better.
Below a photo, click once or twice to enlarge.
To be continued…
Regards Yrvind
Hi Friends.
Today with the help of Peter we cut 2 sheets of 15 mm birch plywood into 5 cm strips. 6 cm was the original idea. I cut one 6 cm strip with the jigsaw to test the bending. It worked and I cold have bent it more with some force but take it easy. Therefore 5 cm was decided. It was easier to twist and less angle to twist.
Not a good idea to glue the planking to the molds. Previusly I put tape on the frames to isolate from the glue. Today I split PVC hose. That will also be kinder to the real composite boat so I thougt I might as well test it now on the mock up.
Below one picture.
To be continued…
Regards Yrvind
Today I completed the jig.
Paradoxically, its seams that the boat going to give me lots of space at the sme time it do not take up very much space in my workshop. The is plenty of space for me to do good work.
I am very happy with the lines so far.
Now I am going to clean the workshop and sweep up the sawdust before cutting up the 15 mm birch plywood into 6 cm stripes.
Below are two pictures. Click once or twice to enlarge.
And one without me.
I am going to try to get a phone that has a camera with a wide angle lens that better can show my new boat that is longer.
To be continued…
Regards Yrvind
Hi friends
There is good progress on the hull jig.
Half of the molds are now on the strongback and me I think it looks fine.
Below are some pictures, click once or twice to enlarge.
Also Sailing la Vagabonde have published a video interview with me done in the Azores. We also spent some time together in Porto Santo. There is many comments.
To be continued…
Regards Yrvind.
Molds and other rigid bodies have six degrees of freedom. They can change their position forward and backward (surge), up and down (heave), left and right (sway). Translation in three perpendicular axes, combined with changes in orientation through rotation about three perpendicular axes, often termed yaw (normal axis), pitch (transverse axis), and roll (longitudinal axis).
When setting up the jig it is important that the molds are rigidly fixed in all the six movements movements.
The aluminum profiles take care of the up and down movements and roll.
The lengthwise markings on the aluminum profiles takes care of the forward back position and yaw.
The centerline takes care of the right left movement. The plumb bob takes care of the pitch.
Its good to be careful and make strong hull jig because each plank adds to the pressure on it. There is a concrete flor in my workshop. It is strong.
Below is a picture of the aluminum profiles fastened to the floor.
Click once or twice to enlarge
To be continued…
Regards Yrvind
I started to cut the middle mold from 18 mm spruce plywood supplied by CEOS. Then I did the ones fore and aft. To my surprise the had more beam. The joy of my idea to mirror the aft part of the model had clouded my thinking. Of course the widest part of the boat was not in the middle but a bit aft.
A step from the beaten track and you are a child in a new world. There is always something to go wrong when you try something new. The world is to complex to be predictable. My molds had brought me back to reality. If at once you, fail try again.
The easy fix was to make the middle one a copy of her neighbors. When the hull is lifted of the molds it bulges out in the middle anyway a small bit. So that takes care of that problem.
Click once or twice to enlarge.
If you like please support to my project. Use the donation button. I thank all of you who have already done so.
To be continued…
Regards Yrvind
Today i borrowed a big van from Håkan and drove to CEOS in Norrköping and loaded a big pile of plywood. Thanks CEOS for that, more about that later.
Peter helped me to get it into my workshop.
I also got new ideas for the lines. I cut the parabolic stretched model in the middle and put her on a mirror and played around a bit. Slowly as I watched the images from a distance it became very clear that mirroring the aft end was the ansver especially taking a Cape Horn passage into consideration.
Click once or twice to enlarge
I have also changed the layout. Below is picture of my notebook.
To be continued…
Regards Yrvind.
Hi Friends.
Space is now created for next Exlex the full scale wooden mock up.
The base the aluminum rectangular hollow sections are going to be securley attached to the flor.
After that getting plywood or kryssfaner as we used to say here in Sweden before our proud language got anglicized.
Photo below.
To be continued…
Regards Yrvind
Hi friends.
I am working on the lines for my canoe cruiser. Below is three 1/10 modells.
The first one 5.4 meter long from the year 2003. The two other now both 7.68 long carbon reinforced one lineray stretched by 1.42
The one not yeat finished stretched paraboliccaly to 7.68 to give her a bit more volume in the ends. The parabolic stretching gives fuller ends. The parabolic is a squared function, like the series 1 4 9 16 25 …
The beams of all 3 modells is 1.28 meters. Thuse the lengt is six beams long. Modern boats are unfortunaturally only 3 beams long because lenght is nowadays so penelised. But traditionally, before engines many boats used the six beams lenght for easy resistance, when powered by oars and sail. The first naval arkitect and by definition the greatest, God instrukted Noa to use those proportions when building the Ark.
Accordingly, Noah’s instructions are given to him by God (Genesis 6:14–16): the ark is to be 300 cubits long, 50 cubits wide, and 30 cubits high (approximately 134×22×13 m or 440×72×43 ft)
The Azorian whaleboats where 12 meteParabolic curves have pleasing shape.r long with a boam of 2 meter. Very seaworthy boats. The Cornish pilot gigs had similar proportions as do the Venetian Gondola. According to Wikipedia they are Today’s gondola is up to 11 m long and 1.6 m wide, with a mass of 350 kg, Often five persons are on them one man rowing.
One more exampel of a group of succesful narrow boats are the Swedish skerry cruisers. They are slender boats, with low freeboards and tall rigs. In 1923 Westin designed a 40m² boat which was 15.2 metres long and had a beam of only 1.74m – a length to beam ratio of nearly 9 to 1.
Gerdny 18.8 long with a beam of 2.85 designed by Erik Salander, 6.7 beams long is an other example.
Captain John Voss famous canoe Tilikum in wich he sailed across the three oceans 1901 had similar proportions, 11.5 long 1.68 beam
I am now ready to start building the full scale wooden, sailing mockup. The planking will be 15 mm plywood or so. I look forward to an interesting Christmas and New Year.
I have been talking to the plywood man. Now I have to do estimate of how much material I need.
To be continued…
Regards Yrvind.