Sheer clamp layer 2

Submitted by v28build on Sun, 2007-10-21 23:53

v28build

Dane and I spent a bit and got the second layer of sheer clamp on port and starboard. Actually went on easier than I expected. Nearly messed up forgetting to clean up some of the epoxy drips from the first layer, but went back over it with the hand planer and a hammer and chisel for a few nooks and crannies. Actually went really fast.

It was one of those jobs that I'm glad is done and worked well, but there really isn't much to "show"... just another board running right where one already was. I do have one issue that I will have to deal with somehow later... one of the notches for the sheer clamp on Frame B (at the bow) wasn't deep enough. I didn't notice it and the first layer was all attached and glued in. Now with the second layer on there, the second layer sticks out proud of the hull line. Its fine on one side, but about 1/4" off on the other. Guess I'll have to plane it down fair to keep things symetrical.

Dane also got to learn about surface area when he asked an very astute question... we had a little backing block that got glued onto the sheer clamp... he commented that it was part of the boat now. I stated that it would probably come off it I hit it with a hammer. He was immediately concerned with "if that will come off when you hit it with a hammer, what happens to the entire boat if a big wave hits it". Good question... another learning experience in explaining how a very small surface had the glue on it versus the entire structure, etc.

Time = 2 hours

Comments

Spliling the shape of your planks

Submitted by Anonymous (not verified) on Tue, 2007-10-23 15:36.

Currently building a 15 foot flatbottom crawfish skiff. Just thought you might appreciate a comment about how to determine the outline of the plywood plank which you will attach to either side of your hull. Its called spliling...google the word and you should come up with enough references to figure it out. Get yourself a long or large compass or scribing tool. Approximate the general shape of the side plank and cut a template plank to approximate it, then temporarily clamp it to the side. Make sure the plank is wide enough so that the compass you will use will reach from the tick points on your frames to the template plank. Mine is about a foot long. The compass will have a pointed end and the other end receives a small pencil. Place the pointed end at a point on any spot on a frame, stem or transfom and while holding the compass square to the surface, rotate it to make a semicircle on your temporary plank. You should "take off" from points at each chine and sheer point on each frame and at the chine and sheer points at the stem and transom. Once you've taken off all these points, remove the temporary plank from the frames and lay it flat on the plywood sheet on which you will mark the fixed points. Once the "template" sheet is situated on the plywood sheet that will become the sides of your hull, without moving the compass angle at all, place the pointed end of the compass at any pont on any semicircle and draw an arc onto the plywood plank what will become the side of your boat. Do this again on the same arc but this time use a different spot on the reference arc. Where the two arcs you have drawn on your plywood side intersect is a spot through which you will cut your final plank. Once you have done the very same thing for every semicircle you have on the reference plank, fair a line through all the intersecting points and you will have the exact outline on your plywood where you should cut it to fit exactly on to your frames, stem and transom. You may know al this already, but if not this will save you lots of time. I would not rely on measurements provide in any plan for the shape of the sides. This is the most accurate way to determine that.

Spliling descirption

Submitted by cac on Tue, 2007-10-23 22:51.

Thanks for a great description! I read it a couple of times and think I understand. You are very correct about not relying on measurements from plans... I know there are places my physical boat doesn't exactly match the plans already, despite my best efforts.

This sounds like a great way of pulling the shape off. I've been wondering about that.

I'll do some more looking/research and make sure I understand the process.

Thanks again!

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