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.
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.
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.
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.
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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.