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Old 22-02-2013, 10:41   #1
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want to build a catamaran

hello, I would really like to build a small (maybe 8') catamaran. I have never built a full size boat but would like to start. I have no plans for one yet but I do have to windsurfing sails that I might be able to modify to work. I would like it to be fast, light, and look something like a hobie 16 or wildcat. has anyone seen plans for a boat kind of like this?
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Old 22-02-2013, 11:20   #2
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Re: want to build a catamaran

maybe a up scaled of version of this:
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Old 22-02-2013, 11:33   #3
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Re: want to build a catamaran

Here is a 9' catamaran skiff, which may give you a few ideas.

Duckworks - Catamaran Skiffs - Stable, Dry, and Versatile
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Old 22-02-2013, 11:37   #4
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Re: want to build a catamaran

thanks! 9 ft looks tiny with a person in it! when I measured out 8x4.5' on the floor it looked big!
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Old 22-02-2013, 12:47   #5
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pirate Re: want to build a catamaran

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thanks! 9 ft looks tiny with a person in it! when I measured out 8x4.5' on the floor it looked big!
14ft is generally the smallest for decent use... take a look at and maybe order the Study Plans ($20ish) for a 14ft Hitia Coastal Trek Cat at Coastal Trek - TIKI Designs | James Wharram Designs .. they're easy peasy..
Just cut, stitch and glue... I built the 17ft one..
The hulls on the 14 & 17 are light enough to be put on a car roof rack by one person, and the mast and beams/decking..
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Old 22-02-2013, 13:16   #6
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Re: want to build a catamaran

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14ft is generally the smallest for decent use... take a look at and maybe order the Study Plans ($20ish) for a 14ft Hitia Coastal Trek Cat at Coastal Trek - TIKI Designs | James Wharram Designs .. they're easy peasy..
Just cut, stitch and glue... I built the 17ft one..
The hulls on the 14 & 17 are light enough to be put on a car roof rack by one person, and the mast and beams/decking..
why is it that 14ft is the smallest? how fast is the one you built?
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Old 22-02-2013, 13:31   #7
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Re: want to build a catamaran

why are they not made smaller than 14'? I like the plans but I don't think i'd build a boat that large because I quickly loose interest in the things i'm building unless i'm working on them every couple days. that wouldn't happen. i'm 15 and don't have a job at the moment so it'd take a wile for me to get the parts, and then i'd get board of the idea and use them to build something else.
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Old 22-02-2013, 19:21   #8
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Re: want to build a catamaran

these ones look like a lot of fun to sail, seen a few in the med
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Old 23-02-2013, 04:31   #9
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Re: want to build a catamaran

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why are they not made smaller than 14'?
Am no naval Architect - but I suspect that below a certain size the catamaran doesn't work.......weight (including you!) vs power.

How about a trimaran? Could have a go a DIYing something up yourself - even if not actually building own Kayak (simply the outriggers?). 10 foot long......

Kayak & Canoe Sailing Rig: Ultra-Light, Easy to Assemble and Launch!

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Old 23-02-2013, 05:03   #10
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pirate Re: want to build a catamaran

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why are they not made smaller than 14'? I like the plans but I don't think i'd build a boat that large because I quickly loose interest in the things i'm building unless i'm working on them every couple days. that wouldn't happen. i'm 15 and don't have a job at the moment so it'd take a wile for me to get the parts, and then i'd get board of the idea and use them to build something else.
Then don't take up sailing... it all takes a long time...
Or develop an attention span longer than an advert....
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Old 23-02-2013, 05:05   #11
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Another Wharram you might consider is the Melanesia 16 which is a proa. Probably cheaper than the Hita (my favorite though) or the CLC trimaran that DOJ suggested.

http://wharram.com/site/catalog/buil...igns/melanesia
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Old 23-02-2013, 05:07   #12
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Then don't take up sailing... it all takes a long time...
Or develop an attention span longer than an advert....
Or just get a used Hobie Cat and be done with it.
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Old 23-02-2013, 05:10   #13
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Re: want to build a catamaran

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Then don't take up sailing... it all takes a long time...
Or develop an attention span longer than an advert....
Ohhhh!! Boatie--you heartless brute--but you are right.
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Old 23-02-2013, 06:58   #14
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Re: want to build a catamaran

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Then don't take up sailing... it all takes a long time...
Or develop an attention span longer than an advert....
I love sailing and will never stop. when sailing something new is always happening. it's just that the figuring out everything i'll need to do and building the basic shape is fun, and then after that I want to build something else.
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Old 24-02-2013, 08:20   #15
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Re: want to build a catamaran

There was a fiberglass Hobie 11, that would sink with more than 130# of crew. It is just a question of displacement; if you want to float something that weighs 130#, you need to build something that takes the same amount of room as 131# of water!

Picture a long piece of foam with a triangular cross section with the ends tapering to a point over a two foot length. They look like a very tall three-sided pyramid. If you l;ay them head to toe, they will together displace the same amount of water as a two foot length of untapered hull. The total displacement of your two hulls is now pretty easy to calculate, and the result would be a useable approximation of a hobie hull. You do the math!
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