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Old 22-02-2010, 14:01   #1
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Interesting Aluminum Construction

I ran into a fellow who is building an aluminum boat with a very different method than any I have seen. I thought some here might find it of interest.

I know almost nothing about what he is doing other than what you see here.
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Old 22-02-2010, 14:38   #2
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Looks like he is going by the "Be reasonable and do it the hard way" philosophy. What a horrendously complex and labour intesive way to go about it! Must love extra welding and fitting. I'd rather be sailing.
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Old 22-02-2010, 14:42   #3
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To my untrained eyes, it looks like he's building a wooden boat out of aluminum...
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Old 22-02-2010, 14:53   #4
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Brent, we just bought a 1985 44' steel Pape design boat. 4 chines. It has no stringers. The chines appear to be but welded but also have about 3/4" pipe or conduit on the inside, welded top and bottom. So the "rounds" are the stringers. It is kind of neat in that there is no place for water to accumulate.

I have seen pipes on the chines before but always on the outside where they sort of double as rub rails. So this was a new detail to me.

Being a 1985 boat she has "been around" and is showing no signs of wear and tear. It looks to me to be a plenty good construction method. But, it also looks to involve a lot of welding, though not as much as this fellow.
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Old 22-02-2010, 16:10   #5
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His name is Zeyang, and he's building an aluminum copy of an 1800s wooden lapstrake design used in the North sea and the Arctic. I've been chatting with him on and off for about 6 months. Right now he's in the process of turning the hull over. He has a build thread going on this site:

alu sailboat buliding - WeldingWeb™ - Welding forum for pros and enthusiasts

Anyway he's a nice guy to chat with, working on a boat. Have a look at the thread, it goes into more detail on the boat design n such.

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Old 22-02-2010, 16:12   #6
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Extensive thread by the builder over here

boatbuilding - Sailing Anarchy Forums
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Old 22-02-2010, 16:32   #7
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And one here at CF as well.

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Old 22-02-2010, 16:41   #8
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wow. lapstrake. welded lapstrake.

how does he plan to fair this hull? that's gonna take A LOT of grinding.
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Old 22-02-2010, 17:26   #9
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Seen a couple of steel boats welded this way. Why not alloy.

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Old 22-02-2010, 19:25   #10
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This is the same boat as The Girls thread...for some reason I though this was an all Woman project...which I find very cool for some reason...I guess I get all worked up seeing chicks all dirty grinding away..
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Old 28-02-2010, 02:41   #11
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Quote:
Originally Posted by Brent Swain View Post
Looks like he is going by the "Be reasonable and do it the hard way" philosophy. What a horrendously complex and labour intesive way to go about it! Must love extra welding and fitting. I'd rather be sailing.
Hi Brent. Im the guy building that 100 year old lapstrake boat. Lapstrake boatbuilding has been out there last 1000 years shaped with iron-axe and some bendingforce and iron nails. (just look at some of the old viking boats) I just swapped oak and pine planks for alloy planks instead (+ added a welding machine instead of iron nails)

its not complex and probably less labour intensive if you compare to shaping plates for a cravel hull, especially if you want a real nice looking looking wineglass shaped hull. (not radius chine which is more or less a fake way of try to have a boat look like a wineglass shaped hull)
You also avoid using pyramid roller and english wheels to shape the metal. ordinary woodworking tools is enough..

For me I like nice looking traditional wooden boats, so I prefer this style of building.People who want a hull built faster should probably use another technique. (hard chine planks etc)

It would be an interesting exercise to compare how many manhours we use on different boatbuilding techniques, then people could decide for themselves how much time they are willing to spend.

I rather like sweet looking curves on a lady. :-)


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Old 28-02-2010, 04:43   #12
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Interesting build How are you sealing the "lands" where the planks overlap.
Tapering the lower plank so that the upper lies flat, as in wooden boats?
Where will you run your bead. inside, on top of your lower plank?
Would solve your moisture problem.
I would think, in the final analysis, this hull will not be more labor expensive than a similar wooden lapstrake or carvel planked hull.
You will however, have to be mindful of the electrics in your marina.
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Old 28-02-2010, 09:53   #13
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Quote:
Originally Posted by zeyang View Post

It would be an interesting exercise to compare how many manhours we use on different boatbuilding techniques, then people could decide for themselves how much time they are willing to spend.

zeyang
"we use" - ???

Once you introduce the "we", you can no longer compare (the man-hour requirement of) one technique with another.

Based on the ratio at which a boatyard can spit out hulls, I would guess the building speed order (that may be related to man-hour requirement) looks more or less like this:

-roto,
-laminate,
-welded metal,
-wood.

But note that the tooling and the level of skill in just these 4 samples escape any comparisons. Apples vs. onions.

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Old 28-02-2010, 10:22   #14
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Having spile'd (fitted) many planks on wooden double enders it takes a wide board to get a long plank. as they look stright when in place but in fact are curved when laid flat. How much waste do you get wth the ALuminum? How long s your average plank? Very cool stuff! am now thinking of this for a 4 -5 meter tender project.
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Old 28-02-2010, 10:40   #15
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Wow, to judge someone for undertaking a project that he chooses to seems a bit much. There is no question that Zeyang will have enough linear feet of weld in his boat to have built many single chine hulls. But so what? It's his project and he has his reasons. It is a beautiful boat! It'll be strong and tough and will probably be around for longer than anyone here. I don't think man hours is his primary concern. Craftsmanship is something that we seem to have lost appreceation for. Damn! Look what he's doing!
Carry on Zeeyang. Beautiful job!
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