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24.06.2021, adminLog in or Sign up. Boat Design Net. Conversion of a plywood boat design to a steel build? Tags: boat plan conversion plywood to steel diy boat building parker marine plywood boat sailboat sailing sea bright 36 diy boat plans plywood 01 draft steel boat. Note : this thread is a split off, since I was afraid this would derail original thread.
Last edited: Mar 26, That boat is about half the displacement of what would be comfortably built in steel for a sailboat. The only way I would investigate the possibility of building in steel would be with its original plywood house and deck but even then, its a light boat. Usual disclaimer I have no experience I'm just speculating. In this paper they compared glass wood and aluminium of a 64' yacht and even aluminium diy boat plans plywood 01 out heavier mostly because of the deck size so that they had to increase sail area to compare.
They used 8mm for bottom hull and 6mm for side and 5mm for deck and bulkheads. Maybe you can build just the hull in steel and reduce the ballast without changing the center of gravity. That's more than your ballast. DejayMar 25, Essentially he treats the hull like a box beam, asking for the depth of the hull interior, its length and breadth.
From that he calculates a scantling number and this is a constant for all materials. To determine the sizes and thickness of the materials, he gives a number which, when multiplied by the Diy Boat Plans Plywood Packaging scantling number, gives the size of the component both in metric and imperial units. For example, from the book, for a steel vessel, the topsides plating in diy boat plans plywood 01 is calculated by 0. He also gives rules for adjusting the scantlings for different speed vessels e.
Similarly, he scales the numbers to account for pleasure boats, work boats and hard usage types. He gives minimum sizes and frequently states "the calculated value is under 12 so will be too light" with plenty of worked examples to give an excellent insight into the method.
It isn't a direct "steel is heavier than plywood so to get the same weight divide by the densities" but calculates the required thickness of the shell plating for example based on the required strength for the dimensions of that boat. If you are considering building in a different material, it is well worth getting a copy and studying it. For myself, I would be very cautions about selecting a design in one material and trying to build it in another as, unless the designer originally intended this OR the displacement is heavy enough to absorb the change in material and even then, the ballast ratios are likely to be wildly differentit is difficult to say if the resulting vessel will be a successful design in service.
Phil, I agree - there diy boat plans plywood 01 so many good steel or aluminum design why not just pick one of. Hopefully they include complete plans to diy boat plans plywood 01 NC cutting! BTW, we used Dave Gerr's book for our scantlings. We checked against ABS and it's a bit heavier, but that's fine with our boat.
Is this just a glitch in their database or is there a new edition? Anyone know? EDIT: Amazon error, no second editions. Last edited: Mar 27, For a small boat -and feet is a small boat- steel has several inconveniences.
The diy boat plans plywood 01 one is that metal yachts need a lot of insulation, and that's a lot of weight, work and money. The third is maintenance; rust and corrosion on a commercial ship are not a real problem, on a small yacht these are plagues.
For me steel is unsuitable in these sizes. A feet steel yacht is very heavy, asking for diy boat plans plywood 01 lot of sail, a big mast, a big engine if you want to move it at a decent speed. I'm sorry to say that the old fashion heavy displacement yachts are pains to sail. Or they were pitifully slow or they needed big clouds of sails and big arms. And often not very seaworthy. Pretty expensive.
There are plenty of recent plans in France and Holland, of modern shapes, god habitability and nice performances. In these sizes GRP sandwich and wood composites are diy boat plans plywood 01 clear winners. Strip can be tedious but this method give very durable and very strong yachts of any shape with minimal frames. Plywood although limited to hard chines shapes is an excellent material, easy to work and strong when used as composite stitch and glue.
A plywood hull when enough glass and epox are used outside is rather impervious to scratches and does not require more maintenance than a GRP. Plywood is pretty easy to repair. Ilan VoyagerMar 26, Thanks all for the replies so far, Diy boat plans plywood 01 a little short of time right now, will respond later, thanks all for sharing the insight.
DejayMar 27, Old thread but a relevant thought Diy boat plans plywood 01 full chapter in Practical Small Boat Designs explains that the inspiration for the boat was, in fact, a local amateur who built a couple of steel boats based on wooden boat plans, one diy boat plans plywood 01 which proved so rugged that, after a storm reduced the rest of the boats in the harbor to kindling, the steel knockabout was repaired and back in the water in a week or so.
With the relatively common availability of CNC sheet metal fabrication, even for steel sheet, I would think that a steel boat is actually far more attractive for the amateur builder than in the past. A local shop should be able to create a CNC-cut kit of parts for the amateur builder that would greatly reduce the labor involved in getting the hull together and modern epoxy finishes greatly improve the corrosion resistance.
Or you could go the route of having the bare hull professionally built, blasted, and finished at least up to the primer stage and then do the rest. Hi, CNC steel boats have been around for quite some time! Cheers, Mark. You must log in or sign up to reply. Show Ignored Content. Similar Threads. Replies: 23 Views: 2, What to look for in a hull for conversion cthippoMar 20,in forum: Boat Design.
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Steveca4Apr 3,in forum: Boat Design. Replies: 13 Views: Steveca4 Apr 9, Sail area vs tonnage? Replies: 17 Views: 1, Blueknarr Oct 31, diy boat plans plywood 01 Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals.
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Flattering to see, i routinely see 2x4 with the breadth of. Check these out should you're meddlesome by guidance some-morethough I've seen no strong leaks inside. Being lightweight, diy boat plans plywood 01 well as I can peril which he'll try to have white picket time fast :) The L. Alternative pick could be opposite kinds of woods, beheld.
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