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Boat Building: Plywood Boat Building Plans
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The typical assumption is that plywood used in boats must be made with waterproof glue. However, the accepted standard for such a glue is one whose bonds will survive a boil test.

How many boats are ever subjected to boiling water conditions? None I know of. Fact is, for generations, countless plywood boats have been glued together successfully with low-cost powder-water mix plastic resin glue a urea-formaldehyde product.

But it will survive hundreds of consecutive cycles of immersion in water at room temperatures. The point is, Interior grade plywood is not rated for exterior or marine use where such panels may be exposed to moisture because grading standards permit non-waterproof glues in their manufacture.

However, does this mean that such a panel might fail if exposed to exterior or marine conditions? Perhaps not if it is assembled with a highly water-resistant glue such as plastic resin. Besides, the practice is penny-wise and pound-foolish. For structural members, stick to either Exterior or Marine panels. But I think this is too rigid a rule. The important quality separating Marine grade from Exterior panels is the quality and soundness of the inner plies and their construction both are made with waterproof glues as noted above.

With the Marine panel, there should be no major voids or surface defects, and inner veneer joints if they occur should be tightly fitted. You might be able to save some bucks by using Exterior plywood for planking curved areas. But the problem with lower-quality panels is that you may not always see the voids. And if your panel does break while you are installing it due to hidden voids, you will have to replace it with another, thus making the cost about comparable to what you would have spent on the better Marine panel in the first place.

You may have to make some repairs to the panel e. But in flatter hull areas such panels will suffice for most boats. Exterior panels with any major defects repaired when possible can usually also be used for most internal members throughout a boat without problem for such items as transoms, gussets, bulkheads, etc. But since the boat will probably by sheathed with fiberglass, some builders use the C-side outside and fill all the defects with resin putty prior to fiberglass application; they become invisible once painted.

On smaller, simpler, low-powered boats without a lot of curvature, I see nothing wrong with this practice, and again, have not heard of such a boat disintegrating over time because of it. A: We generally recommend covering all plywood boats with fiberglass no matter how small. While some complain of an increase in weight, this is seldom more than an ounce or two per square foot of area in the typical application. Then too, even lightweight coverings say 4 ounce cloth are better than nothing.

When I speak of covering the outside of plywood boats with fiberglass, I use the term generically; you can use other fabrics such a Dynel or polypropylene, but fiberglass gives the best combination of price, ease of application, ready-availability, and protection in my opinion. Whichever fabric you select, the reasons for applying the covering are the same; added abrasion resistance, improved durability, extra reinforcing for finish coatings especially at joints , reduced maintenance, better appearance, and to help insure against leaks.

Thus sheathings should be considered as basically cosmetic coverings; their intent is NOT to add strength. In fact, plywood is far stiffer than fiberglass. Hull strength comes from the plywood hull structure itself, and with proper design and construction, should prove more than adequate.

Glen-L carries epoxy , fiberglass cloth and application materials. A: If it is made with Douglas fir a reasonably tough material , surface checking and wavy surfaces will soon occur even if painted.

These will be very difficult to alleviate even if the boat gets painted each season. Other plywood types with a more uniform grain pattern will fare better in this regard, but these will still require routine coating applications. And because many species of plywood are not as tough as fir, they will more easily suffer damage without sheathing. If you absolutely insist on not sheathing your plywood boat, consider using medium-density overlay MDO panels.

These still require routine coating, but the overlay prevents surface checking and presents a smooth paint-ready surface. These do cost more and may not be readily available, however. Q: Epoxy resins sound great but they cost too much.

Can I use polyesters for sheathings instead? A: We quit offering polyester resins for sheathing application years ago simply because we no longer believed in them anymore for this purpose. Finish results with either otherwise appear the same, but polyesters are less flexible and resilient so tend to crack more easily over time.

When this occurs, water can creep behind the sheathing and cause problems. As for the encapsulation process where all wood surfaces inside and out get coated, do NOT substitute polyesters this way in place of epoxies. See the epoxies available from Glen-L. A: Because the stresses on a plywood boat are ultimately transferred to joints in the hull, a hard-setting glue rather than a flexible mastic, for example is required.

As a result, glue choices are few. But as discussed above, plastic resin glues can work successfully in plywood boats for all practical purposes. Currently resorcinol costs more than epoxies, and offers no benefits over plastic resin glue in my opinion. Unlike epoxies, both need well-fitted joints, specific limited temperatures, heavy clamping pressure, and leave colored glue lines.

This uses a powder-water mix along with a second liquid component, dries clear, and has some gap-filling properties. Once popular with kit airplane builders, it may still be available from suppliers in that field. Q: Can I increase fiberglass thickness in order to get by with thinner plywood or compensate for lower quality plywood? Primarily it involves the fallacy that plywood is weaker than, and inferior to, fiberglass. Keep in mind that while fiberglass is strong Plywood Boat Building Plans Growth in tensile strength, it is not very stiff.

Conversely, plywood is actually stronger on a weight basis in both tension and compression. More to the point, the modulus of elasticity stiffness is actually much higher for plywood than fiberglass for the same thickness. Then too, for some reason many who ask this question think fiberglass is lighter and will thus save weight. This myth is quickly dispelled when a piece of each material gets thrown into a pond of water and the fiberglass sinks like a stone while the plywood floats.

So the simple answer is that if you reduce plywood thickness and make up the difference with fiberglass laminate, you get not only a more flexible panel, but one that weighs a lot more. It will also add considerably to your cost and effort.

And if this question is asked because thicker panels are not available, the answer is to use a double thickness of plywood rather than attempt to make up the difference with fiberglass. Environmental and economic factors, coupled with very modest demand should warrant even higher prices in the eyes of producers.

On a cost per square foot basis, many common materials are considerably more expensive than plywood, such as carpet and resilient floor coverings. Compared to all the other boatbuilding materials an amateur may use, only steel is cheaper than sheet plywood. A: This is generally poor practice in the framed plywood boat for several reasons. First, a main reason for using solid lumber for frames is that grain gets oriented in the direction we want for strength.

If plywood is used for frame members instead, because of the alternating grain direction of the plies, there is no strength in those veneers in the cross-grain direction. Rows and Motors and will sail rings around other character boats. Quick DIY wooden canoe that works better than most flat-bottomed canoes and many fibreglass ones. Half the weight of many fibreglass canoes. Lighter than most plastic. It has been designed to be as easy to build as possible while keeping most of the qualities of a nice paddling wooden canoe.

In particular the ability to track � excellent first boat plan. Click here for a comparison between our fast and our classic paddling canoe plans.

More Information about the plywood Quick Canoe Plan. Light on the land, Prettiest Plywood or wooden Canoes anywhere. Click here for a comparison between our paddling canoe plans.

Click here for more information about the Eureka Plywood Canoe. DIY plywood canoe for fishing and roof racking. Click here for more information about the Plywood Quick Canoe Electric. Cruising or teaching with three adults or excellent club racing performance sailing with 1 or 2 in the boat. The famous line is we can build 10 of these in the Philippines for the price of importing a single Laser sailboat.

Boat speeds are very matched for excellent Plywood Boat Building Plans Meaning tactical racing when not heading off for a family picnic with two adults and a bunch of kids aboard. For training, the goose will carry an instructor and two adults to sail with good sensitivity and speed. In stronger winds, we commonly see downwind speeds of 10 to 13knots and sometimes much more.

Yawl Rig with speed � a wooden canoe that can scare the Lasers at your local club. A small boat for amateur boat building that is light enough for one person to roofrack 70lbs plywood canoe hull. Sailing Canoe boat plan. Create a paddle or sailing outrigger canoe from a fibreglass or wooden Canoe or Kayak. Convert your old canoe into an awesome sailing machine or fishing or diving platform.

Each component is under 10 pounds and everything removes cleanly from the boat apart from 4 small fittings and a mast step.

These Amas and crossbeams work for fibreglass and wooden canoes and dinghies, Fibreglass, Aluminium and some plastic canoes. Performance sailing see the video on the plan page or as a stable fishing platform or to make a super quick sailing multihull. If you buy the plywood boat plan for the outriggers there is a free supplement available to set it up for sailing.

Very cheap plan for a big boost in performance. Find out how to convert your canoe, kayak or dinghy to a fast sailing outrigger canoe. Click here to find out more Outboard Punt Boat Plan. Simple lightweight rowing skiff for one person and maybe a passenger based on the Goat Island Skiff. Simple lightweight rowing skiff for one person and maybe a passenger or a couple of kids.

Based on the Goat Island Skiff. I used to get enquiries about using the Goat Island Skiff sailboat hull for rowing. It does row well but blows around too much. Find out more about the plywood Rowboat Plan.

Picnic boat, party boat, river-cruiser, camp aboard, mini home-away-from-home. Simple plywood construction. Read more about the 27ft Venezia cruiser canal boat plan. OzRacer RV is the same small boat hull but with more space in the cockpit and is a slightly simpler build. These Boat plans are a modern boatbuilding course in a book. Capacity 1 adult and one child or maybe 2 adults.

Find out more about the OzRacer RV. OzRacer Mk 2 has a centreboard for more performance but a bit less room for extra crew.

Three sheets plywood. Simple Plywood Boat Plans. Find out more. Download Free Oar and Paddle Plans from this page. The Kombi is the boat for this use pattern. Mast diameter will have to go up to 60mm to handle the greater stability from the outriggers. I would suggest setting up two spreader bars set the same distance apart as the outrigger crossbeams with the mounting points for the outrigger tie downs just behind the spreader bars. I think it would be quite a satisfactory boat.

I would definitely carry paddles as I suspect the tacking technique will be like a roll tack for the standard Kombi so it will spin fast.

With the outriggers it may be a bit sluggish � or maybe it will be fine. Also there is a free supplement written for buyers of the outrigger plan to alter the crossbeam curve to match canoes with lower freeboard. That would match the Kombi too. Single or tandem paddling rivers estuaries and such Sailing safe not high performance Fishing. When Viola appeared I thought this could be it? But a bit wide for paddling, a bit flighty and a bit heavy.

The along came Kombi! And I already have your drop in outrigger plans�Perfect! Could you perhaps suggest a layout for a Kombi Tri including any hull mounting reinforcement.

As we age needs change and I am going to jury rig a couple of amas to the GIS this summer as a proof of concept experiment. The Kombi Tri I would build as a package , concept already proved.

Thanks Wayne Fremantle. Storer, I am thinking about combining your drop in outriggers with either the new Combi or the Viola sailing canoe.

Has it been done? Your thoughts? Thanks, Gary Moore. If you have facebook, Thomas Newton made some changes that seem to have worked out well removing the need for the centrecase bulkhead and associated seat. I am interested to learn how many plywood sheets go in 27ft Venezia and 35ft TC35 builds. And also the TC35 resulting hull weight estimate.

Can you share on that? Is it available? Thanks in advance,. It can be tricky to find roof racks for some modern cars that can handle even the 70 odd pounds of the OzRacer RV hull. But if you can do that, then no problem. Really good stuff that simplifies everything considerably, especially in regards to point of sail. The reason I chose the RV was purely for space reasons. Another question I had was in regards to whether the RV is suitable for roof rack transportation?

Not having to buy a trailer would also cut down on costs :. But I would also have a careful look through the basics of my online lessons as they are closer to the state of the art than many sailing schools. There has started to be large difference between what is taught and what the best sailors are using.

Also, have you considered the 12ft Oz Goose. The biggest reason for choosing the shorter OzRacer 8ft is the storage after building. The cost is only a little more because the sail and everything above the decks and the fittings etc are all identical. Building difficulty and time is identical too � about an hour different actually. I then went down the rabbit hole and started digesting countless books, researched terminology and watched demonstrational videos.

This also seems like a great beginner boat. My big question however is would you recommend I take sailing lessons before building and sailing the RV?

Hi Michael, Thanks for your prompt reply. I replied yesterday but had issues with my browser. Anyways a putt putt boat is fine and the ability to trailer the boat is paramount. Getting down around southern moreton bay or the Noosa river, lake Cootharaba. Do you know of any builds in my neck of the woods, sunshine coast.

Kindest Regards Tony. With the high thrust 10hp Yamaha it has substantial grunt. But despite the cabin you really need to think about it in terms of being like the old open Putt Putts. There would be conditions that would be unwise to go out in, but plenty of conditions and parts of the bay that would be available as they are quite protected. It would start to get tricky heading up to the North part of the Bay parallel with Moreton Island with one of the strong North Easters.

But down toward the South you would just pick the location relative to the water conditions on the same day. It will be a bit big as the wind gets stronger but sparkling performance in up to 12knots of breeze. Might be exciting by the time the wind is at 15 and hard to sail in much more than that.

Could trial it with the full rig and then get a local sailmaker to cut some sail off the bottom if it is too frisky and cut a similar length off the bottom of the mast. Another way, though not very good upwind would be to wrap the sail around the mast a few times when the wind gets up. Though the sail shape will become a big baggy for going upwind well. There is also a supplement for the Eureka and other canoes as the freeboard can be a bit low for the drop in outriggers.

I provide a drawing on request for making a mod and it also includes how to build the upper mast support into the front crossbeam. The plan itself is more like an instruction book for boatbuilding techniques to build the particular boat. Do the steps one by one and you will have the boat. Basically you draw straight lines across the narrow width of the ply sheets at a set interval � dotted vertical lines in drawing below. Blue is the plywood.

Green is the curve of the panel. The dimensions are purple. Then put the end of the tape on the edge of the plywood and measure along each dotted line it will be a solid line on the ply. Put a mark at the distances from the edge shown in the plan. After marking the points on the first line vertical line, do the same for the second line and so on to make a series of dots in a curve. If there is an error it will stand out either when you stand at the end of the sheets and look along the line, or the batten will tell you the point is out of place.

If the point is out of place it is very likely a misread or a mismeasure as most of my plans have been corrected over time.




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