Kaimusailing

s/v Kaimu Wharram Catamaran

Vessel Name: Kaimu
Vessel Make/Model: Wharram Custom
Hailing Port: Norwalk, CT
Crew: Andy and the Kaimu Crew
About: Sailors in the Baltimore, Annapolis, DC area.
24 March 2017 | St. Marys, GA
23 March 2017 | St. Marys, GA
20 March 2017 | St. Marys, GA
15 March 2017 | St. Marys, GA
05 March 2017 | St. Marys, GA
28 February 2017 | St. Marys, GA
24 February 2017 | St. Marys, GA
24 February 2017 | St. Marys, GA
24 February 2017 | St. Marys, GA
18 February 2017 | St. Marys, GA
11 February 2017 | St. Marys, GA
11 February 2017 | St. Marys, GA
09 February 2017 | St. Marys, GA
06 February 2017 | St. Marys, GA
31 January 2017 | St. Marys, GA
22 January 2017 | St. Marys, GA
12 January 2017 | St. Marys, GA
04 January 2017 | St Marys, GA
29 December 2016 | St. Marys, GA
26 December 2016 | St. Marys, GA
Recent Blog Posts
24 March 2017 | St. Marys, GA

French Toggles

The goal is to refinish the foredecks and the rest of the cabin sides by the end of the month. Some work on the outrigger canoe is being done at the same time.

23 March 2017 | St. Marys, GA

24 In. Multipurpose Trim Guard

I can tell when I have undesirable work ahead of me, I start doing everything else that I can think of. The hatch installation job was set aside so I could do something else, which turned out to be the proa, outrigger canoe, project. Now I had to get back to the hatches, but I still found other things [...]

20 March 2017 | St. Marys, GA

Birdseye View

It was time to return to working on the big catamaran and the installation of the new large Bomar hatches. I had cut out the hatch coamings to accept the new hatches and added new wood to the perimeter of the coamings to compensate for the wood removed. In order to get a perfect fit, I taped off the [...]

15 March 2017 | St. Marys, GA

BeamBrackets and Cold Snap

The remaining fiberglass work on the outrigger canoe included the underside of the inboard side deck and the bottom of the main hull. The inboard side deck already received a 3 foot wide fiberglass belt amidships and now only needed two 3 1/2 foot sections fore and aft to be completed. These are the [...]

05 March 2017 | St. Marys, GA

BFB Test Fit

The epoxy order was on its way so I used up the last little bit I had, priming the main hull’s decks and the bow compartments. The ama deck was primed and then I was out of epoxy.

28 February 2017 | St. Marys, GA

Side Deck Trouble

I had to order more epoxy, I was using it like a fiend. Laminating the hiking seat took 900 ml, about a quart, and that was only for the core. The two layers of fiberglass that wrap it will take as much or even more.

BFB Proa Assembly

18 February 2017 | St. Marys, GA
Capn Andy/mild winter
First I have to give some good reviews to a couple of businesses that have done an excellent job, both sell products on eBay. lcd4notebook is a vendor of laptop computer displays and I ordered a new display for the new toughbook. The display came in, but its backlight didn’t work, so I contacted them and they shipped out another, expedited the shipping, and it was their big New Year holiday. Very happy with them. The second is Grant Philips, emmy1234us on eBay, a custom machined bolt vendor. He made an adapter for my VHF antenna and in talking with him I found he also can do almost any kind of foundry or machining work. I spoke with him about the need for custom parts for solar panel installation and wind vane self steering installation.
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Back in the woodshop I continued with the outrigger canoe. I cut out the panels for the main hull sides. The hull sides consist of a total of 8 pieces of plywood, but they can be laid out with just 2 patterns. One pattern is the bow section, 5 feet long, and the other is the midship section, 4 feet long. A hull side consists of two bow sections at either end and two midship sections in the middle. The seams between the sections are butt seams with butt plates or butt blocks glued over the seams. The width of the plates is equal to the width of a scarf joint. The design puts these seams at stress points in the hull because they have a double thickness of ply. Where a scarf joint would provide equal strength as the surrounding plywood, the butt plates provide a double thickness of ply, thus greater strength.
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The ama, or outrigger float, was wound up with its spanish windlasses, bulkheads, and center keel seam stitched with copper wire. The seam and bulkhead edges were then filleted with epoxy filled with 50/50 phenolic microballoons/"glue strong” mixture. Glue Strong is colloidal silica with 20 percent milled glass fibers. Instead of filleting the seams and then glass taping over them, the mixture I used provides plenty of strength and is lightweight and easy to work with.
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After the epoxy set, the copper wires and spanish windlass twine were removed, and the tops of the bulkheads were trimmed down flush with the gunwales. I decided to install the flat deck on the ama with a 12“ circular cut out right amidships. It will just fit. In the cut out I’ll install a Gamma Lid, which is a screw on lid for a 5 gallon bucket available at the local home improvement store for less than 10 dollars. If the lid and its surrounding plastic rim won’t fit, I’ll cast the female threads into the deck opening out of epoxy mixture.
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I cut out the two bulkheads for the main outrigger hull. They are rectangles 1 foot wide and reaching from the bottom of the boat up to the gunwale. They are installed 4 feet from the
bow(s) and form a flotation chamber with the deck at the bow. I made sure they were wide enough for the gamma bucket lid to form a hatch allowing access to the space in the bow. The shape of the side of the hull is slightly flared amidships, then going to vertical at the bow bulkheads, then with slight tumblehome at the bows. This produces the “destroyer bow” shape.
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Amidships I plan to have no bulkhead, but will use a former to maintain hull shape while it is being built. Later, side decks will be installed to maintain the shape.
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I would need an 18 feet long workbench to build the outrigger’s main hull, but my table is only 8 feet long. I made sawhorses along the lines of those in the “Kayak Shop” book. I made an extra one for the woodshop to use as a support when cutting long pieces of wood on the table saw.
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The long stringers for the main hull were sanded smooth and then the hull sides were glued up, first each bow piece and midship piece were glued together producing 4 pieces that represented the bow and stern of each hull side, then these were glued together to produce the 2 pieces that are the hull sides. The stringers were glued on using sheet rock screws to clamp them together. This produced about 250 little holes left over after the screws were removed.
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The hull sides were temporarily clamped together with the bulkheads clamped in place and then the ends of the stringers were trimmed. The gunwale stringers were lopped off and the ends rounded to a 1 1/4 inch radius. The chine stringers, called chine logs, were bevel cut so that they could fit inside the narrow angle of the bow.
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The midship beam was set by clamping a piece of stringer to one gunwale and adjusting the other till the beam was correct, 20 1/4 inches. The beam of the chines was set similarly to 15 inches. Now something looked wrong. The shape of the bottom, the shape made by the chine stringers, was distorted. It looked pinched, not fair, amidships. Then I remembered I made the bulkheads 12 inches wide to accommodate the Gamma Lid access ports. It was only a little change but it looked ugly. I experimented with the shape at the bulkheads, keeping the gunwale beam at 12 inches, but letting the chine beam reduce to around 10 inches, the original computer rendered beam. The gamma lid would still fit and now the hull looked fair again. The photo is of the hull being temporarily clamped, resting on the sawhorses.
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