LATEST NEWS on the new 17' build-it-yourself trimaran
LATEST POSTINGS ARE ON TOP — scroll down to see early modelling and start of build
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Posted September 22, 2010
An AMA now has its chines (corners) taped and faired in (see Construction Tips on Taping Joints
Next step is sheathing the whole exterior surface.
There are a few easy steps that make this seemingly intimidating job quite easy to do.
Working from the center towards the ends is one.
See many more in Construction Tips on Sheathing a Hull
Posted September 20, 2010
A main hull has its exterior gunwales bonded on and ready for the cockpit sole.
Here the cockpit sole is pre-fitted. All interior parts will have 3 coats of epoxy before closing and the slot for the dagger board will be cut before bonding.
Note, not everyone will go for large hatch openings cut here. It will depend on the planned use of the boat and also what large standard covers are available locally.
Posted September 9, 2010
The bottom goes on a main hull and a boat takes shape in the Philippines. With sails already ordered, this one is scheduled for a boat show in October!
One may well ask: where's the gunwale? For a multitude of reasons, and ready to break tradition where it makes more sense, the W17 designer chose to place it on the outside! Here it better serves as attachment for the outer cockpit seat; moves the cross beam support as far out as possible; simplifies the inner structure by eliminating numerous bh'd notches; simplifies attachment of both mainsheet traveler and bowsprit; provides an exterior ledge to help lift the hull and finally, it removes this structural member from digging in your back when sailing down in the cockpit on light wind days ;-)
Posted September 5, 2010
Another W17 ama starts to take shape. Go here for more tips on Installing Gunwales and Stringers
Posted September 1, 2010
An AMA with its skin, waiting for a final sand and sheathing.
Before removing from the Building Platform, bond on the stem-cap and also make the support cradles (suggest 25mm foam)—placing them around Stn 3 and Stn 8. (Use the bhds you've already cut for the 2nd AMA as guides for the cradle.)
Here are the AMA ends. The hull is now all set to be lifted off the Build Platform, in order to add fillets to the inside.
Posted August 29, 2010
Here, the first of several W17s takes shape in a more factory-like environment.
While those long steel clamps are very useful to hold things together, care must be exercised to use them gently and with pads under them when bonding in order to distribute the load. The bulkhead in way of the daggerboard case is just a temporary one.
Posted August 27, 2010
Under Construction Tips
, you'll find some help for general assembly of a plywood boat but also specifically useful for the W17 amas and main hull. Several NEW articles have just been posted.
Posted August 25, 2010
Here is a fitted inboard AMA skin panel. Note the plastic under the staples into the stringer and stempiece, so that staples can be removed with minimum surface damage. Also note the strip of ply stapled to the front face of the stem piece, to keep it straight and vertical until the two side panels are bonded in place.
Here the outboard panel is being prefitted—always a necessary step. While web straps are useful to hold the panel up in place, I also prefer to place one central pin or 5mm dowel through the sheet into a stringer, so that after pasting thickened epoxy over the stringer, gunwale and bulkheads, the panel can be slid on the locating dowel into exactly the same location as during the pre-fit. Otherwise, much of the epoxy can be accidentally wiped off.
Posted August 20, 2010
One question that's starting to crop up fairly often is this, "Why do the plans not give precise offsets for the skin panels … why the 5‑10 mm margin on the Nesting Plans?"
A few builders even want to plug the panel offsets into a computer and have numerical controlled (NC) machines cut out their plywood for them! In a perfect world, that might indeed be a fine way to go, but to look at the issues involved here, see the article Why a Cutting Allowance for the W17 skin?
Posted August 19, 2010
Meanwhile in the USA, an ama starts to take shape.
The stringers look pretty solid, but that's because the section is actually fairly small.
Also keep in mind that on a trimaran, it's the amas that can be hit by another boat or the dock and the main hull is well protected from such impacts.
Note the small hole drilled in each vertical ply support to correctly align each bulkhead.
Also the lashings used to pull the stringers into place while the joint cures.
With a good fillet added later, no other attachment is required, as the ply skin will bond and connect to both.
Four partial-height bulkheads will be fitted once the hulls are turned over. Required for deck support and beam attachment.
Good idea to bevel or round off the inner edges of the stringers. Not only looks neater and saves a few grams but the main advantage is that the coating will not have to go around a sharp corner and therefore become too thin for good protection. Note here that for the W17, the position of a partial bulkhead has been marked, so that there's a square shape retained for the intersection. One can either round off the stringers full length and then make bhd. recesses for them with rounded corners - or as in this case, cut the recesses square and later round off the stringers between the bulkheads.
Posted August 14, 2010
Well, with typhoons, power cuts and loss of email service solved for the moment, some pics have finally arrived from the Philippines where a couple of boats are expected to be sailing this year. Seen here are the main hull bulkheads set up with the dagger board case unit and stempiece. The keel batten is temporary to hold things in place and check bottom fairing. Things can go quickly from this point.
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