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Monday, January 12, 2015

Kingfisher Drift Boat Build - Hatch Trim & Hatches

I enjoyed the holidays with my family and got back on the build with installing the hatch trim and making the hatches.

There are 4 deck hatches and two pedestal hatches. The 4 deck hatches access the dry storage boxes. There are dry boxes on each side, each with two access hatches.

I first had to make backing that glues underneath the deck plywood along the edges. This reinforces the decks and gives up something to attach the hinge screws. The hatch backing is made with strips of 1/4" Okoume plywood that are about 2" wide. I made the strips and cut them to length. I had to make special strips that were about 5/8" wide that butted to the deck rail that runs lengthwise under the deck. Once these were cut I set them aside to flow coat with epoxy before gluing them in place under the deck and around the hatch opening.

I them had to make the hatch trims. These are strips of white oak that are 1/4" thick  x 1 1/4" wide. I made a list of the sizes required for each hatch opening and cut them approximately 2" longer than the finish length. Once all the pieces were cut to length I had to cut a saw kerf on one side near the top edge create a slot to install hatch coaming. Hatch coaming is a type of gasket seal. The saw kerf is about 3/32" deep x 3/32" wide. It is cut on one edge about 5/32" from the top edge. I set up fingerboards on my table saw and cut the saw kerf on each piece. I then set them on a table to flow coat them with epoxy.

Here is a piece of the hatch trim. It is 1/4" x 1 1/4". The saw kerf is on the top right.

Once they were flow coated and finish sanded it was time to install them. The hatch trim pieces fit inside the hatch openings. The bottom of the hatch trims are set flush with the bottom of the hatch backing and stick up above the deck about 3/4". The pieces are glued in place with thickened epoxy. Once the pieces are glued in place. (4 for each hatch) I cut sticks that were wedged inside to hold them in place. I did this for the 4 deck hatch openings and the two pedestal hatch openings.

Here's a photo of the hatch trim installed on the front pedestal. It sticks proud of the opening by about 3/4". The back is flush with the back side of the opening. It was glued into the opening with thickened epoxy.

This photo shows the hatch trim installed at one of the dry box openings. The opening has been filleted with epoxy peanut butter to seal the deck opening.


I next had to make the hatches. They are constructed with white oak trim that has a rabbit to accept a 1/4" Okoume plywood panel. The stock was milled to 5/8" x 3/4". I milled a 5/32" x 5/32" rabbit on one edge to accept the panel. The hatches must be large enough to fit the weatherstripping. The next step was to mitre the pieces for each hatch. I then cut the plywood panel to size.
I glued the miters and the rabbet to accept the panel with thickened epoxy. I clamped the assembly all at once.

Here is one of the pedestal hatches. This is the back side. It looks sort of like a tray.

Here is the front side of he same pedestal hatch. It has been flow coated with epoxy and sanded. It will get one more flow coat of epoxy and then multiple coats of varnish.

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Have any Questions or Comments? Let me know, Clay.