Author Topic: yet another build option??  (Read 10327 times)

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arthor

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yet another build option??
« on: February 23, 2010, 10:07:48 AM »
Initially I was trying to fit a build into my garage but the wife put the mockers on that (can't imagine why???) and I have organised some space up at the marina but I will need a temporary shelter and so want to reduce the time needed up there to a minimum.
To that end, I want to prebuild as much as possible in my garage, sort of like a GA kit and also incorporate a few ideas. Some of which is similiar to jadranko's idea on the FAQ thread.
I want to prebuild bulkheads, - Forward outboard well, rear of pilothouse, front of pilothouse, rear of cuddy (I want a small area between for a head and hanging cupboard) and forward of cuddy. I figure that at each point where I want these, it should be possible to calculate dimensions (unless Brian could sort me some out if given the distances).
These bulkheads I would build to sheer height and in halves with appropriate notches for stringers and sheer shelves and steps for the chine flats. I would also have made ready some ply webs to connect them at the build site. The connecting webs would be fitted so there was a space enough between them and the join in the hull bottom panels, allowing me to run continous glass once I flipped the hull.
Once on site, I would set up the transom, bulkheads, bowstem. Make up the bottom panels and fit them, trim if necessary. Fit the chine flats. Fit the side frames then hang the sides. Fair and glass. Flip her over and glass the insides, extend the bulkheads where necessary. crack on.


Brian.Dixon

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Re: yet another build option??
« Reply #1 on: February 23, 2010, 10:18:40 AM »

This is sort of how you build anyway.  There are under-deck bulkheads that go in first, then everything is decked over, then the bulkheads that you mention are added from the deck up.  The construction manual describes how to fit the bulkheads to the boat, e.g. how to take dimensions and get them cut out.  Since the sheer structure and side panel plywood will always bend slightly differently for each build, it's best to fit the bulkheads to the boat after it is flipped.

Brian

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arthor

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Re: yet another build option?? part 2
« Reply #2 on: February 23, 2010, 10:19:24 AM »
Me again, can't seem to fit it all on that first bit. Forgot to mention that as well as the bulkheads, I would put in temporary frames.
I reckon that hanging the side panels will be easier with more fixed points of contact
I only turn it all once.
I also reckon that I can stagger joint the shelves (2 layers of 3/4 ply?) as surely their greatest strength comes when the are capped later.
I have seen other boat plans that stagger joint the bottom and side panels with some using two/three layers of quarter or three eight in strips sometimes quite narrow. Not sure why it all needs to be scarfed especially when the joints in the layers could be up to 4 feet apart??

One final point. In my quest for a kit that is not 28' long, is it possible to do the LVL in three bits using those zeddy step joint things with three quarter ply the same depth epoxied and screwed for a couple of feet either side of the join??

All nutty stuff and sounds mad but I can see it in my head ok but it looks a bit odd in type.

Your thoughts ??

arthor

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Re: yet another build option??
« Reply #3 on: February 23, 2010, 10:20:36 AM »
wow that is seriously quick tech help. Thanks Brian

arthor

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Re: yet another build option??
« Reply #4 on: February 23, 2010, 10:23:57 AM »
I see what you mean about the sides bending a bit but that is surely only because they are sort of hanging there on their own with not a lot to stiffen them up or fix them. If they were attched to bulkheads I would have thought they wouldn't flex much at all. I could even tack them on, mark them, trim them and then rehang??

Brian.Dixon

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Re: yet another build option??
« Reply #5 on: February 23, 2010, 10:26:43 AM »
If you're going to build stringers up from shorter pieces, I'd rather see you join them with a long diagonal joint, e.g. diagonal from top to bottom of stringer, that spans 6+ feet fore/aft, then glass it well.  Cut the joint with a saw, but do not sand it, then pre-wet with unthickened epoxy and glue it up on a flat surface (using a straight edge to guarantee a straight beam).  Use epoxy thickened made from about 20% glass fiber, 20% silica, 60% wood flour.

Brian

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Brian.Dixon

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Re: yet another build option??
« Reply #6 on: February 23, 2010, 10:30:48 AM »
I see what you mean about the sides bending a bit but that is surely only because they are sort of hanging there on their own with not a lot to stiffen them up or fix them. If they were attched to bulkheads I would have thought they wouldn't flex much at all. I could even tack them on, mark them, trim them and then rehang??

It's not that things vary a lot, but your molds for carrying the sheer shelves may be slightly different from somebody else's (width, height), the shelves may not bend exactly the same, the bottom panel assembly may not be exactly the same height above the jig when you put the sides on, etcetera.  You won't have much boat-to-boat variation, but may find differences around 1/4" here and there, maybe more for some.  Yes, you could build the bulkheads in advance but may have to trim them to fit (kind of a pain ...big bulky pieces to trial fit) or fill gaps larger than you'd prefer to fill (with epoxy.)  So far, those that have started on the boat report tight fits however, gaps no larger than 1/8" as things go together.

Brian

The Great Alaskan - Professional performance - Easy to build! - https://www.glacierboats.com  ><((((?> ... ><((((?> ... ><((((?> ... ><((((?>

arthor

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Re: yet another build option??
« Reply #7 on: February 23, 2010, 10:34:13 AM »
Thanks for that one on the stringers. All the other stuff I think wouldn't affect the strength of the boat but I was worried that the stringer thing would.
It is not what I intend to do anyway, I will look into the cost of transporting two full stringers from my home up to the build site. I just wanted to know that it was possible and if I have to then I will certainly do it the way you outline.

Many thanks

Brian.Dixon

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Re: yet another build option??
« Reply #8 on: February 25, 2010, 06:13:36 PM »
Thanks for that one on the stringers. All the other stuff I think wouldn't affect the strength of the boat but I was worried that the stringer thing would.
It is not what I intend to do anyway, I will look into the cost of transporting two full stringers from my home up to the build site. I just wanted to know that it was possible and if I have to then I will certainly do it the way you outline.

Many thanks

Haha ...shipping costs for long LVL beams is the main reason that I hear this question.  I should put something in the FAQ about it... (note to self)

Brian

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