Article by Pere Riera from Barcelona
I want to share my micro cruiser project with you because possible it might be interesting to other enthusiasts of these mini boats, and we can share ideas.
I have been sailing since I was 14 years old, starting with dinghies, competing in the 470 class, family cruises on modern fiberglass boats, and currently on a beautiful classic 42-foot long keel ketch that I have owned for 26 years, sailing with my family all over the Mediterranean.
Now, at 66 years old and approaching retirement, I am thinking about a project for a tiny cruiser to improve mobility and eventually replace my beloved 42, which is fantastic but now demands maintenance work that I am unsure I will be able to handle in the near future.
The idea is to design a small but heavy sailing cruiser, but since I am no longer a tough "youngster," it must have the following minimum essentials:
Interior height of 6'
Self-bailing cockpit almost 6' long for a good siesta with a bimini.
Two generous single beds that can be converted into a large double bed.
Separate bathroom with shower and washbasin for my privacy.
Kitchen with 2 burners and space for pots, etc.
100-liter drinking water tank to aid keel ballast.
75-liter plastic gasoline tank for 200 or 300 miles of autonomy with a small outboard motor in calm seas.
Electric refrigerator for some beers.
Ability to install two 160-watt photovoltaic panels on the bimini for total autonomy.
Watertight, easily collapsible aluminum mast to facilitate road
transport on a trailer.Easy access from the ground via the stern when on the trailer, enabling amphibious mode for trips impossible with a large sailboat. This ladder will also help me climb back on board from the water in a dignified manner.
Must be usable for long periods both on land on its trailer (with a
dry toilet) and at sea.Made of plywood and easy to self-build.
Full keel with good displacement (heavy) for stability and self-righting in case of capsize. Cruising speed is somewhat secondary. The goal is to live on board without hurry, waiting for favorable winds.
Draft must not exceed 2' (0.6M).
Must not break my budget.
Must have an attractive appearance (at least to my eyes...).
Capable of long passages and unsinkable to avoid the need for a
heavy liferaft.Ability to install radar, VHF, and AIS.
DIY wind vane self-steering.
Well, this is the long list of my essentials, backed by my sailing experience. The challenge is fitting all these desires into a 15.5' (4.75M) sailboat.
How is it possible? Let's be honest, it won't be the fastest or most beautiful boat in the club, but I think it can be achieved. The fundamental, indispensable feature that makes these characteristics possible is the "keel box," a great idea from master Bolger, my inspiration. This keel enables the interior height, a large freshwater tank, and the ease of placing lead or iron ballast at the bottom of the keel box simply by gluing heavy pieces (lead or steel plates) at the bottom (no casting or juggling; ballast can be installed when the boat touches the water to gauge the real center of gravity).
Why 4.75M? It is the resulting measure of joining two 8' plywood sheets
lengthwise.
I don't think it will be an easy boat to build if all the details I've described are included, but it will surely be more economical than a 28' with the same requirements. I also don't want it to be an eternal project, as my expiration date might be short.
Can you spend long periods on a 15' boat? I think so, if we have a minimalist attitude. I get excited reading stories of bicycle travelers who travel the world for years with only 30 kilos of equipment. This 30 kilos includes the house, kitchen, food and water for several days, four-season clothing, enough changes of clothes, a mechanical workshop, computer equipment, and a few other things. If I tell these bicycle travelers about the comforts and equipment of my "super sailboat," they would surely think I
am a spoiled bourgeois with excessive luxuries.
Below are some photos of the design for anyone interested or just curious to
comment.
I must say that I am not a naval architect and cannot guarantee the results—
I am just an enthusiast.
The drawings are available on Onshape, searchable by the name "sailboat
Caracolito." They are public, and everyone can freely access them. You can
also contact me at my email Pedrorivi60@gmail.com to exchange ideas. •SCA•
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...
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