(↓↓↓BASIC CALCULATIONS BELOW ↓↓↓)
A short video (including pictures) of the building progress on my small 12' sail cat, almost entirely built with cheap construction materials and with relatively few tools. The whole build lasted 3 weeks and costed about 500 US$. I didn't use any plans, but only relied on a few basic calculations kindly provided by my friend Dario.
Below are the basic calculations I did. Unfortunately I don't have much more... I built it a few months ago, at my dad's home, and can't access it at the moment. You can get most info through the video and estimate dimensions.
Note that with these dimensions (the mast has about 5.2m, the boom 1.8 meters, the hulls 4m long, about 60 cm deep and about 50 cm wide) the flotation is just enough for one 80kg person, and even so, the deck gets very wet. Deeper and possibly wider hulls would be better, although to make it faster, longer rather than wider hulls would be preferable. The sails are small, and perform well only in relatively strong winds, thus I suggest a longer mast if you can, or a longer boom (in case of a longer boat) depending on the average winds you have in your region (also, you can use a much thinner beam for the boom, like the "stick" I used for my bowsprit. The 2"X4" beam I used is way to heavy). I have a total sail area of about 10 sq. meters, which really isn't much in light winds. The mast stays are made of nylon on my cat, however I strongly recommend steel stays, especially with a skinny mast like mine (4cm X 8cm X 5.2m) since it bends a lot in strong winds.
My wooden deck is maybe pretty, however it's as heavy as both hulls combined(!!!). You can try to make it with 1/4" plywood, and add a few small structural beams under it, to lighten the boat.
Because of the very sharp hulls profile, I don't need any keels or centerboards to keep the boat in a straight line. However, like on monohulls with very long keels, tacking the boat is tricky since it won't turn around so fast, and the lightweight construction means the boat will stop immediately once you get into the irons and the sails lose all power. In my case, I use a paddle to help the boat tack around or either simply jibe (although when going upwind, jibing is very inefficient).
Негізгі бет Building a cheap sail catamaran
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