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Bulkheads and hatches

Intro

Well, a couple of weeks ago, we participated, as part of kayaking classes, of an eskimo roll intruduction. The original S and G Guillemot, which passed to my wife after I built the strip version, didn't have bulkheads installed, just a couple of large publicity bottles, which were more than enough in case of an emergency.

If the sprayskirt doesn't fail, rolls are perfectly feasable in this state, but, particularly during the learning process, sprayskirts do fail. Even though the floats will never let the kayak sink, the amount of water coming in is so large, it gets quite impossible to manage the boat, and a trip to shore is necessary.

As the S and G Guillemot was already closed, and access to the places where the hatches should go is difficult, the system used in hatches as used in the strip built Guillemot was almost impossible. The selected system, with a raised hatch, has resulted very effective, though somewhat involved to construct.

Preparations

Before starting the building process, it's very advisable to make a sketch on how to solve the problem. Many factors influence the angles of the sides of the frame: the width of the cut (to remove the hatch), the angle of the deck, and the thickness of the sealing.

This drawing is to determine the inclination necessary, taking into account the width of the cut, and the thickness of the sealing strip. First I drew the deck and the (raised) hatch. Then I drew a couple of wood strips separated with the correct distance for the sealing strip. I then rotated this last drawing till it touched both the hatch (outside) and the deck (inside). In the next section are drawings for different deck angles.

Once glues (with a couple of drops of fast-setting epoxy glue), I sanded the top and bottom borders to be flush with deck and hatch. Be careful not to unglue the strips.

Next step is applying glass cloth to reinforce the construction. I covered the hatch completely, but the deck frame only received a 6cm wide strip. Once the fibreglass has been applied you can use putty to fill out any spacing between frame and deck/hatch.

Finally, and after as many hands of sanding, epoxy and varnish as deemed necessary, you can glue the sealing strip (I used 1.5mm neoprene) preferably using (water-resistant) contact glue.

Specific drawings for the Stitch and Glue Guillemot

Below are a couple of drawing using angles which I measured on my boat. Yours might be slightly different, though probably near enough to use the drawings anyway. Of course, if you want to apply this method for another boat, you're on your own.

The construction if the deck were perfectly flat. A template made according to this drawing is useful to align the wood strips of the front and back of the hatch.

Construction of the sides of the frame, at the aft hatch.

The construction of the front hatch hatch frame.

If the work was realized with some care, you'll have hatches that close quite well. The ones described here survived (actually the next day) 5 hours of winds of more that 20 knots, and waves over 1 meters (which is quite a lot for our small lake). Not only were the hatches perfectly sealed, after opening them you could still appreciate the smell of the last coat of varnish.

Continues with phots of the construction (1)

9005


(c) John Coppens ON6JC/LW3HAZ mail