Discussion about this post

User's avatar
Jerry Culik's avatar

Once again, the genius of Phil Bolger reappears...in the form of the box keel to solve the height problem inside the cabin of a small boat. I've noodled around with the problem -- and the solution -- on my own mini-cruiser design. And I'm looking forward to seeing more when you start building! Can you clue us in on your self-steering system? I agree with the small refrigerator and solar for a few creature comforts. We're sailors, not backpackers! Let me know if you need some ideas...

Expand full comment
Pedro Riera's avatar

I would like to add some notes about the design of Caracolita. It has been like designing two boats: one that floats, which is the upper part minus the keel, and the other is one of neutral or slightly negative buoyancy that we could call a "submarine." The floating part has a displacement of 370 kilos without load and 670 with crew, which I believe might be quite optimistic, but in flat-bottomed boats, this is not a major issue if we err in this data.

The submarine part has two sections: the stern volume is neutral because it will be filled with 100 liters of fresh water (at least at the start of a long journey...). The bow section has a volume of 260 kilos (for the 40 cm keel width version) that must be kept neutral by placing the same kilos of a heavy metal like steel or, preferably, lead in the flat bottom of this keel to offset this buoyancy. This ballast will also support the sail and right the boat in case of capsize. This ballast can be placed after launching the boat into the water and adjusted after equipping the sailboat and with the crew on board.

To reduce volume, I have designed this wide keel where we "walk" and narrow at the ends. It is not the most hydrodynamic design, but it is the lightest.

I have drawn three "widths" of the keel: a minimum of 40 cm or 15.7 inches with a displacement of 230 kg, another of 50 cm or 20 inches with 310 kilos, and another of 60 cm or 23.6 inches with 375 kilos, which can be very comfortable but seems excessive to me and also reduces the width of the cabin berth, which is one of the important aspects of this design. I think I will go for the 50 cm width, which is a good compromise.

This keel also has the advantage of being the "chassis on the ground" for the rest of the construction, saving on wood used.

https://photos.app.goo.gl/exvGAdbTrvHZrr5h9

Expand full comment
7 more comments...

No posts