Useful info if you wish to build a hollow ama.
Tuesday, January 2, 2018
Thursday, December 28, 2017
Sunday, December 17, 2017
Sunday, November 12, 2017
Michael Coonrod has an Ulua for sale at Lake Wanaka in the South Island of New Zealand.
The hull is made of Kahikatea and Red Cedar. The decks have Totara and Kahikatea. It's set up with a stub mast rig for windsurfer sails. The boom was made for windsurfer sails, and any windsurfer sail can be adapted to fit this rig. This is the high wind sail, but it has two others that could go with the boat if wanted as well. It can also be sold with a 2HP mercury.
Contact Michael at: email@example.com
Monday, October 23, 2017
Monday, September 25, 2017
While my small outriggers don't require this degree of effort in lashing them together, it is still of great interest to see how larger vessels accomplish this task. Lashings reduce the stress concentrations that would result from simply bolting things together. The first time I took my Ulua surfing and watched it cartwheel though the surf after it threw me out, I have been sold on lashings. If it had been bolted together I would have been gathering up pieces, but instead it was completely intact.
Monday, September 18, 2017
Friday, September 8, 2017
Monday, September 4, 2017
I thought I'd share what my Wa'apa looks like these days.
I've put a shunting dipping lug schooner rig on it. The sails are pretty well balanced, I think each COE is about 12-18 inches aft of the mast. Each sail has a continuous tack line that goes through two blocks, one ahead and one aft of the mast. Hauling the tack to the new tack point is generally enough to get the yard to dip over to the new side. The sails set beautifully and symmetrically on each tack. The total sail area is 160 square feet. On a recent outing (with mutli-day camping gear aboard) I was able point higher and sail faster than a Welsford Navigator, so the rig does fine working upwind. I couldn't really tell you how close I can sail to the wind, since I generally sail in pretty significant currents. It does seem to point better when the currents are favorable... I haven't come up with a great way of keeping the sails from blocking each other on a run, so it isn't the fastest boat going straight downwind although it does fine. I'm working on extra tack points to move the fore sail more toward the ama. The sails have two reef lines at 25 and 50%. Since I generally do multi-day cruises, I love knowing I can reef and do it early and often.
It started out life with the oceanic lateen shunting rig. A beautiful, fun rig to sail. I decided to try another rig in a powerful afternoon wind on a mountain lake. While shunting in high winds, the sail with both 20 foot spars would kite high into the air, occasionally swooping in to snap off an unsuspecting cleat or body part. At that moment a pair of smaller, reefable sails sounded more manageable.
The photo shows the boat in full cruising mode. You can just see the inflatable kayak/safety ama on the leeward side. That is a fantastic combination. Anchoring is often more practical than pulling ashore here (Puget Sound) with tide swings that seem to generally be in the 15-20 foot range. So having the kayak as a tender is very convenient.
The main hull is fully decked. Each of the three sections is divided in two with a watertight rigid foam bulkhead. Each compartment has a somewhat watertight hatch. The center section hatches are stored inside their compartments most of the time, but get put in place in force 4 or 5 when the reefs go in.
I have a 30 inch wide trampoline and a park bench for comfort. I sleep on the trampoline and set up a lean-to tarp between the bench back and the masts.. The park bench makes for comfortable sailing in high winds or when I'm not worried about performance. The bench also provides a solid surface for setting up a stove.
I have an asymmetrical triangular cross section ama. The ama has about 1 person worth of buoyancy. It is a single piece, 16 feet long and has two removable hatches to air it out during storage. The leeward side is vertical. I have a foil whose top slides along a rod above the ama. The lift gets transferred to the straight, flat side of the ama. The foil needs to be a couple of feet behind center when working upwind, and can go all the way aft for downwind. The lines that pull it along the rod also release a brake that clamps onto the rod. When the sails are aback, the foil is free to pivot up, so the boat has relatively little lateral resistance aback, which makes me feel like there is less stress on the parts of the boat that weren't really designed for those forces. I have stays on the masts going out to the amas that have been converted to 1/8" dyneema since this photo was taken. They make me feel better about the forces on the masts while working upwind.
Shunting is pretty quick, but also pretty busy when singlehanding (almost always singlehanding). Release the (continuous) sheets (aft first to get the old bow to start falling off). Release the (continuous) tack lines. Tighten the new forward tack line. Shift the foil aft. TIghten the new aft tack line. Sheet the aft sail in part way (not all the way, it will stall). Sheet in the forward sail. Generally sheet in the two sails together, keeping the aft sail a little tighter, since you are also trying to swing the bow to windward. With camping gear, and a few days food and water aboard I can shunt about as fast as I can decelerate the boat and accelerate it on the new tack.
I transport the ama and masts on my car top. The rest of the boat gets stacked on an 8 foot utility trailer. I can set up or take down the boat in about 45 minutes for day sailing. It takes 1.5 hours if I need to inflate and attach the kayak and load up all my cruising gear. It often takes longer when I'm talking to people who are interested in the boat. My record is about 2.5 hours when I assembled it at the Port Townsend Pocket Yachters Palooza while talking to many interesting people.
The boat (just the two hulls, actually) is about 5 years old now. Still no name; I'm open to suggestions...
Tuesday, August 29, 2017
Sunday, August 20, 2017
Wednesday, August 2, 2017
Monday, July 24, 2017
Tuesday, July 11, 2017
Thursday, July 6, 2017
Saturday, June 17, 2017
John Misky and friends in New Zealand are building a Samoan style sailing canoe. He sawed, planed and sanded a big block of foam to the shape he wanted and then took the sectional shapes off of it to make ply molds for strip planking. Follow progress at his Facebook page.