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#1
10-12-2009, 07:55 AM
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| Trimaran motorboat / stabilized monohull Some pics of my 10m proto and drawing of the futur 12m. On the proto : The center hull is 80 cm wide, the amas are 20 cm wide. The hull is 500kg in plywood/fiberglass. The 60hp outboard make her going 22 knots woot / 17/18 cruise. Does somebody made something similar to share numbers with me ? Sorry for my bad English, I am a french frog!         |
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#3
10-12-2009, 12:12 PM
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| Hi Eric, welcome aboard  Quite a stylish thing, ain't she? (And I, too, am jealous of your beach  )Rick Willoughby (member on here) has been tossing around some variations of a "faux-tri" concept with some similarities to your hull. And on the larger side, one of the U.S. Navy's new Littoral Combat Ships also uses a similar tri-hull configuration.
__________________ - Matt Marsh - Marsh Design (small craft blog and designs) |
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#5
10-12-2009, 12:49 PM
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| Interesting design ! If you have more pictures it would be nice to see more of it. The rest of you should note that Eric is a very clever person - note the fishing rods on his boat 
__________________ Regards Fanie Water ! Just gimme water ! |
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#6
10-12-2009, 03:34 PM
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| thanks ! more pics of the construction on http://cinqiles.blog.fr/ more pics of our beach on the same link ! |
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#7
10-12-2009, 04:50 PM
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| Figures?
__________________ www.sassdesign.net I'm not lost, I'm just uncertain of my position. I'm still confused, but on a higher level |
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#8
10-12-2009, 05:29 PM
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| Eric's hull dimensions and general below-water shapes are pretty close to those of a tri I'm working on now, although his is 2 m longer on the main hull waterline. If his bare hull is 500 kg, I would expect maybe a hair over a tonne (say 1000-1200 kg) with motor, equipment, fuel and a couple of people. (Eric- can you confirm your actual weights?) From my own calculations, 20 knots or so for a tri this size on 60 hp is not at all unreasonable.
__________________ - Matt Marsh - Marsh Design (small craft blog and designs) |
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#9
10-13-2009, 02:22 AM
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| Weight empty / no motor 500kg 60hp 2 stroke yamaha 102kg Varta 55Amp 15kg ? fuel 100 kg hydrolic pump cylender and auto pilot 10/12kg aluminium anchor and chain 15kg extras 100kg TOTAL : 850kg empty 22 knots wot is with 2 frogs 70kg and fishing gears for a total of aprox 1000kg Cruising at 4000 rpm with 17"pitch prop give 17/18 knots depend on waves. Cruising at 4000 rpm with 7 people and camping gear for a total of aprox 1600kg give 15/16 knots I should try a 15" prop but can't find one ! |
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#10
10-13-2009, 02:33 AM
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| That puts it around 60hp/tonne Looking at my chart of old boats and sea trial data, that gives around Tq of roughly 4....this equates to 22 knots...so yes, stacks up. With 7 froggies....(and their cheese, wine and bread too?? )...roughly 17~18knots..so again, not bad, stacks up with other trials data of this "type" and "size". |
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#11
10-13-2009, 02:54 AM
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| Great looks, and I bet she's a nice dry ride in waves. Alan |
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#12
10-13-2009, 03:54 AM
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| Fantastic Eric! I too would be jealous of your beach...if I didn't have access to similar ones myself The boat is somewhat reminiscent of "White Rabbit" a superyacht built here in Tassie... if on a slightly more...err... practical scale Please - more pics - particularly of the interior - I'm interested to see just how much space you managed to fit into (onto) such a narrow hullform. There are a number of people (myself included) who are working on variations to the stabilised mono theme. Your's is a fine example - congratulations!
__________________ Will Imaginocean Yacht Design Logic will get you from A to B... Imaginocean will take you everywhere else... www.imaginocean.net |
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#13
10-13-2009, 05:17 AM
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| Hi Eric, Nice looking boat. I was wondering about forward visibility though. How are you ensuring that? I am currently designing a trimaran myself. A lot smaller than yours. LOA: 5.90 m Beam: 1.95 m Draft: 0.40 m Power: 15 - 20 HP She'll be heavy though (about 1000 Kgs fully loaded), because I am designing her to be built from steel. I expect to get about 10 Kn @WOT with a 15 HP. 
__________________ Hoping to finish the design and build of Karamu this decade... |
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#14
10-13-2009, 05:57 AM
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| Eric i have just looked at your website and cannot find any pics of your boat on the water other than the 2 photoshop pics of the boat on the "beach" am i missing something? Your build pics are great - and if you were able to go from wooden hulls (April 2009 entries) to the water in 6 months you did remarkably well Your design concept is very interesting but it would be nice to see pics or video of the "tri" underway 
__________________ Bye bye Folks - off to see the world ~~~/)~~~ :) Compulsive Neurotic Manic Depressive, but basically happy :) http://compaxboats.wordpress.com/ http://www.boatdesign.net/forums/boa...ser-27869.html |
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#15
10-13-2009, 06:50 AM
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| Thank's all !! Martin, I think that lightweight is the key for economie ! "tri hull" structural shapes are easy to make very strong, much stronger than a clasic monohull. Make a balsa model of your boat and try to twist it !! You will see how strong it is ! I wouldn't go for steel. Manie, I will try to catch pics and video of the "tri" underway. |
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