Thursday, 30 May 2013

Second layer on the bottom

After finishing the prep it was time to put the last layer of ply on the hull.  First piece of ply is full width as the hull is not too wide .

Below is the first piece ready to attach, zig zag scarf on rear which is located over a hardwood cross piece on one of the frames:

In place from from the front:

And rear:

By now the bottom was wider than a single piece of ply, so marked the centreline and worked out each side.  There is another frame just behind where the above join is, I had to scarf extra onto a sheet of ply to make it long enough to reach a frame near the rear of the hull so decided to put the extra up the front where I can screw is down to both frames.

Below is preparing the joins:

Then gluing the scarfs:

Once that was done I could cut the zig zag joins on the end of the second pieces and trim the third pieces (almost a full sheet as well in length).  I dry fit them using a couple of screws front and rear only, drilled and countersunk all the remaining screw holes and put all the screws in place.

Below is looking rearward:

And forward:

Close up of one of the zig zag joins between the second and third sheets:

Screws across into hardwood cross pieces and along the join to the sides are 1" (25mm), 200mm grid in between of 5/8" (about 15mm) which if I didn't screw them in too far should not come through on the inside.

Epoxy on the first layer ready for the second sheet first half:

And finally some comparison shots.  Looking towards the transom from the back of the first sheet before:

And after all screwed in place:

You can just see in the photos that the joins on the first layer are covered by a solid sheet on the second.  No two joins are on top of each other in the two layers.

Next is to fill all the holes, trim the join between the sides and bottom in preparation for fibreglass taping the chine and bottom joins, and then the whole hull.

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