Bill Burruss
Well-known member
All,
It’s looking like a Cacklery kind of summer on Duckboats. We have started the build process on our upsized Cackler, and will see if we can keep up with Bob. The wood arrived last week, and epoxy/fiberglass today. We decided to go with 3/8 meranti hull/deck, 3/8 okoume deck, ¾ okoume bulkheads, and ½ meranti floor. Will try U.S. Composits 3:1 epoxy this time.
To enlarge the boat, we are adding ¾” to each lofting station, and multiplying each offset by 1.0625(12.75/12). This should result in a dimensionally correct Cackler hull with all the lines as designed, just a little larger at 15’ 2” length with 6’ beam (very close to a snow goose). One minor exception is the ply is ¼” too narrow to cut both the upsized side and bottom panels from the same wood, so we will reduce the side panel height ¼”, resulting in overall freeboard only about 3/4” higher than original. This will leave little scrap on the shop floor. I have a little extra ¾ and ½” ply, so hopefully we will have enough wood for bulkheads when we get there.
For the bulkheads, the plan is to custom fit each one by making a “jig” from a spreader bar at each of the “stretched” bulkhead positions. The spreader bar will be scaled to the width of the respective bulkhead. We will then attach pieces of scrap ply to each spreader bar, with a corner touching each chine line. This should establish the 4 outside corners of the bulkheads. Attaching a stick from the center of the spreader bar to the low point of the keel should give the 5th critical point on the bulkhead, and from there we should be able to transfer the “jig” dimensions to the ply. Will post pictures when we get there.
Had to pull the Gougen scarfing tool out of retirement.
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Amazing what a new high tooth blade did for the old saw. For 3/8 ply, it still takes some cleaning up for a proper scarf.
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Took a little time to calculate the new offsets. Almost wish I had bought the metric plans. At least Alex got to do a little practical engineering work.
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Take Care!
-Bill
It’s looking like a Cacklery kind of summer on Duckboats. We have started the build process on our upsized Cackler, and will see if we can keep up with Bob. The wood arrived last week, and epoxy/fiberglass today. We decided to go with 3/8 meranti hull/deck, 3/8 okoume deck, ¾ okoume bulkheads, and ½ meranti floor. Will try U.S. Composits 3:1 epoxy this time.
To enlarge the boat, we are adding ¾” to each lofting station, and multiplying each offset by 1.0625(12.75/12). This should result in a dimensionally correct Cackler hull with all the lines as designed, just a little larger at 15’ 2” length with 6’ beam (very close to a snow goose). One minor exception is the ply is ¼” too narrow to cut both the upsized side and bottom panels from the same wood, so we will reduce the side panel height ¼”, resulting in overall freeboard only about 3/4” higher than original. This will leave little scrap on the shop floor. I have a little extra ¾ and ½” ply, so hopefully we will have enough wood for bulkheads when we get there.
For the bulkheads, the plan is to custom fit each one by making a “jig” from a spreader bar at each of the “stretched” bulkhead positions. The spreader bar will be scaled to the width of the respective bulkhead. We will then attach pieces of scrap ply to each spreader bar, with a corner touching each chine line. This should establish the 4 outside corners of the bulkheads. Attaching a stick from the center of the spreader bar to the low point of the keel should give the 5th critical point on the bulkhead, and from there we should be able to transfer the “jig” dimensions to the ply. Will post pictures when we get there.
Had to pull the Gougen scarfing tool out of retirement.
Amazing what a new high tooth blade did for the old saw. For 3/8 ply, it still takes some cleaning up for a proper scarf.
Took a little time to calculate the new offsets. Almost wish I had bought the metric plans. At least Alex got to do a little practical engineering work.
Take Care!
-Bill
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