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Location: Texas simple catamaran hull design I've been trying to design a simple-to-build catamaran, and I've come up with this hull design.
Location: Texas Well, I live by a good sized lake, at its deepest part its probably 30 feet deep. Location: USA You may want to consider a cross section shaped more like a U than a V. Location: Miami Catamaran keel design I have a P43 Privilege, 25 ft beam, 26000 lbs displacement with fixed keels. Underway, either under power or sail, especially in shallow water and hull speed over 8 knots, the boat tends to squat, progressively until the bow raises and the water line at the transom (i.e. I have extended the swim platforms 48 inches which has resulted in adding at least 2 knots to the hull speed. At the next haulout, I am considering changing the shape of the keels to a foil shape, similar to a conventional aircraft wing but symetrical on both side and tapering the trailing edges to less than 1 inch. Location: Milwaukee, WI James Wharram desings cats that have a section and don't have keels or centerboards. Location: Rainier, Oregon Here's one simple catamaran design that sounds similar.
I've more-or-less figured out the rig, and now I'm working on hull-rocker (the curvature of the keel is important to the maneuverability of the boat), and cross-sections next. Rather than bother with dagger boards, I intended to use long keels that were to be half the length of the hulls. Of course, any other catamaran on the lake would blow my design away in a race (but maybe not if it were asked to cary the same payload).
Originally Posted by emcmia I have a P43 Privilege, 25 ft beam, 26000 lbs displacement with fixed keels. I have one brand new available (left over from my old rental operations) if you're interested.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Location: tablerock mo hull seperation Hey, you might go to Jack's Plastic Welding, the make cats and look at sizes and specs. Location: Michigan Looks like you need lots of little friends for this one. Location: uk best hull design for solar powered boat Hi, I am designing a long distance solar powered boat.
Also, hull speed will be very slow, maybe 5 knots, so wetted area needs to be economical to reduce friction, wave creation not going to be a problem.
Heavy Li-ion batteries to be used as storage for all night passage and while lighter than lead acis, are still heavy due to number needed. This is a venture boat, not a family cruiser, mostly one person on board so accommodation to a minimum. I am also interested in this design but i am unable to contact designer trought the e-mail on his web page.
When the college starts in the middle of August, the students will start the construction work. A 35ft catamaran with a modern full battened mainsail fitted with lazyjacks and singleline reefing with good deck gear can be reefed single handed in a minute or less.
I think the Hills would agree that Badger, with its flat-panel junk sails, didn?t sail well to windward.
However, the newer camber-panel and split junk rigs appear to be competitive with Bermuda rigs to windward, while still retaining the junk?s easy manners.
Below is an exchange on the Yahoo junkrig group describing a Slieve?s experience in last year?s annual race around the Isle of Wight using the split junk rig. The real point of the exercise was to compare the rig against a range of boats and the results seem to indicate that the split junk rig, even in its undeveloped form can outperform the average Bermudan cruiser without the crew having to work hard.
Since then I have sailed at the Stavanger Rally and the performance of the boats with Arne's sails confirm that the modern junk rig is a real contender.
I am interested to read Slieve's account of his performance in this years Round the Island race. Apart from the difference in time, we were not tired at the end and went out for a meal before the (60+ year old) boys drove over 70 miles home. The reason for labouring these points is to show that a good home made Junk rig can beat an equivalent cruising Bermudan rig when sailed on equal terms without too much effort on the part of the crew. Location: UK, USA and Canada The Flica would be a better choice for a free standing mast, but I have done it on a cuddy cat like the Romany.
One structural advantage of the free standing mast is that there are no real compression loads so you don't need a deep mastbeam. Attached are sketches of a plan and profile for a 36’ catamaran, with the hulls connected by box beams.
The BV rule is by no means the be-all and end-all of design requirements, but it does include a reasonably good, easy to follow section on the load cases to which a sea-going yacht might be subjected, including catamaran-specific loads (in sec.


Therefore, it is best to ignore the beam up fwd and use the beam for the mast as the fwd beam and the aft beam, as the main beams to take the torsional loads. Originally Posted by Inquisitor Would it be too much to ask for you to elaborate on bridge deck clearance? The other way is for the waterline on each hull to be near its normal position, but for the wave to mound up between the hulls.
This argues for a lower limit to the aspect ratio of the tunnel (under deck, between hulls) as well as a minimum height to the tunnel. In regards to bridgedeck clearance, the maximum slope of non-breaking waves is typically regarded as 1:7, but I have seen transient peaks in confused swell that look much steeper than that.
On the subject of a biplane rig, I'm no expert, but one simple point always seems to me to be lacking from debates on this topic: multiple masts allow a boat (of given righting moment) to carry more sail area in safety. You make a very valid point about air draft however - for an area where very light winds were the prevailing feature a shorter rig is at a definite disadvantage.
I agree windshear is a consideration against low sailplans, but by the same token it favors sails such as gaffs and junks which get more of the sail near the top of the mast. It would be great to get some more info on windshear, if anyone has it, perhaps a series of windspeed vs height for a variety of weather conditions. The data I have seen suggest that the difference between 5m and 10 is more significant than that between 10 and 20m.
Loved the pics of X-IT too, it is much along the lines of what I would like, but I think I'm too lazy to go for a highly streamlined bridgedeck, as I plan to build in plywood.
Theres more than enough room to cruise for hours, and theres plenty of people sailing larger boats (20 to 30 feet) on it.
The pic I saw posted would be easy to build but extremely difficult to turn and would have a terrible draft. This is not his exactly because I made a Tornado with this method in the early 70's from instructions I received in the mail form someone. Each keel is approximately 14 ft in length and extend about 24 inches below the rounded hull form resulting in a total draft of 48 inches. Hobie 14s (only for sailing solo) and Hobie 16s (for sailing solo or double) can be had for a couple hundred dollars, usually with a trailer (put a hitch on your dad's pickup). A rounded-V, however, could be easier to build and is almost as efficient as the famous rounded U-shape. But my design would be twice as fast as the same size mono (with the same level of crudeness) and would be able to be so, placedly.
I suspect that at the start of the day you will be able to manage a higher speed than towards the end of the day.
My main citeria is the ability to carry the biggest possible solar PV array which preferably should be able to be tracked by tilting on two axes. BoxCat was just a proposal, a spar-buoy by the route, design never completed, boat never built. We were in the top third of the handicap fleet of over 800 boats, but that does not tell the story. We tacked 36 times and gibed twice and changed reef twice, yet we only adjusted the halyard and downhauls twice and the main sheet 4 times during the whole 50 miles of the race, and that was with a force 5 to force 6. I also spoke to Colin, the owner of the Konsort and he agreed that we overtook you on the last beat when we started racing again. If you can just sketch up, that is pen on paper, back of a fag-packet type of sketch, the basic arrangement, we can take it form there. In terms of taking transverse pitch connecting moment loads, ie twisting, only 2 are doing the work, the other is just adding weight. The required height is also affected by boat inertia (translational and rotational), hull immersion rate and reserve buoyancy.
We have crewed charter boats in the favourite yachting hotspots in the Mediterranean and Caribbean as well as worldwide locations. Hitia 17 is the perfect beach catamaran merely also up to for use as a micro Coastal Trekker. Commencing a catamaran How do you tackle this huge multihull diy catamaran plans sailboat project ascertain somewhere suitable and start on each hull. I'm pretty much just looking to build a nice cruiser that can carry 2 people, but can be sailed by one. The V-shape is the worst hull design to date, giving the least amount of bouyancy and the most wetted surface.
Catamarans need to have at least an 11:1 fineness ratio (11 units length per 1 unit width). Also (it was hoped) that the flat bottoms, which would be half the beam of the hulls, would get up and plane under really blowing conditions. But the fully battened sail will get the boat to windward far better (otherwise race boats and indeed the vast majority of cruising boats) wouldn't use a conventional rig.
Turning onto the last beat we found the boat dead in the water, and discovered that the bilge water was up to the floor boards, so we pulled out into the adverse tidal stream to get elbow room to pump out and look for the source of the problem.


Add in the fact that we only left the cockpit for domestic reasons and that we did not suffer from water over the deck and it becomes clear (to me) that the rig seem to have every advantage over the more conventional boat.
I looked behind and saw Poppy with her beautiful white Junk rig just coming around the Needles.
Since we need the layout, ie length, beam of each hull and overall, displacement, distance between CL's. If you keep the beam to support the mast and this beam ends up being as stiff as the fwd most beam, then you're in trouble.
I am now also in the process of (slowly) designing my own, and quite enjoying the task, but it would be much simpler if some stock designs were already out there. My own conclusion is that the problem is too complex for a feasible solution, and rules of thumb vary significantly between designers. I would also like to fish from it, but thats not really going to effect the boat design very much.
It will have canted hulls and dagger boards and hopefully blow every other 14' design (and some 16' designs) away. Besides, there is room for doubt how well one would stand with such a simple stay arrangement.
I am going to introduce a discussion of trim foils to address these problems, and likely some of the solutions will be retro adaptable.
If the hull separation is too small wouldn't that interfere with your paddling styles, unless you have one left-hander and one right-handed paddler? The baby stay caught the clew of the sail each time we tacked so it was difficult to sheet in quickly after each tack. She flew through the pack and within 20 minutes had overtaken us, and everyone else it seemed. Because the beam supporting the mast and its loads will attract the main transverse loads owing to it stiffness, yet not be designed for this torsional load.
On the bright side, with a modular design it may well be possible to change the clearance retrospectively if required by modifying just the cross beams. Physical body a catamaran build a cat multihull Building Catamarans and Trimarans Share Your see discover From Others.
I'd prefer it to be as fast or a little faster than my friend's canoe with the 2 of us rowing. I notice the Boxcat is a little wider and has more sail, but otherwise is similar indisplacement and layout. In practice, from earlier calculations and from examination of the log on the plotter after the race it was clear that we had lost over 40 minutes, and that was not counting the time lost carrying an extra half ton of water. After beating a couple of miles up the narrow river I was exhausted, especially when aware that it would have been a pleasure to sail the same trip with my split junk rig. I've tried searching on google, but I really can't find much information on building catamarans, and especially not simple ones. If we subtract 40 minutes from our finishing time we would have been in the top 10% of the fleet, and possibly in the prizes. I really cannot see why anyone would want anything other than a good cambered junk or wing sail.
How to build amp catamaran fast and There are no plans he scarce draws mutton quad for himself on ampere beer carton. I would also like to have something that can be disassembled easily and either car-topped or truck-bedded. I planned on a low aspect ratio rig which would be simpler, cheaper, and less hassle to set up. If there are other differences between the 2 that are not obvious could you please elaborate?
We caught up with her much later in the day - and now I know why- but she still crossed the line well ahead of us. Performance catamaran for the Ellen Price Wood glass epoxy composite construction for the amateur boat builder.
I imagine it would need oversized rudders however, since it probably wouldn't want to turn very well. My firebird doesn't have a trailer hitch and I dont plan to add one because it would just look like crap I can however borrow my dads pickup (also no hitch on it) for launching. My ultimate goal is to simply have a working design, whether its of my own creation or not.
Their asymetric design and volume distribution (and no pylons) make them infinitely superior.



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Comments to ┬źDesign catamaran boat kits┬╗

  1. LEZGI_RUSH writes:
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  2. GOZEL1 writes:
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  3. fedya writes:
    Have one "T" becoming and align the the bow than it does.