We have a decent tide fluctuation in the sound, and aft mooring the boat is typically the norm. Location: Finland Interesting, hope you can find a suitable Finnish builder, atleast I think that there are not too many and final destination of the completed boats will also matter.
Location: Thailand The boat is designed to be shipped in container - in parts. Location: The Netherlands Perhaps the finnish multihull organization can help you with an address.
Laws alone can not secure freedom of expression; in order that every man present his views without penalty there must be spirit of tolerance in the entire population.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. It will not really be used in open seas as I will always be inside the great barrier reef, so you don't get big sea swells, but some short sharp chop type swells. Baeckmo, tunnel height is 480mm from lowest part of hull, according free ships it will displade 1500 kgs at 270mm waterline. My estimate of weight is 1.5 tonne which I have estimated just by seeing what similar size boats are advertised as weighing.
Would anyone have a freeship file of a 'proven' catamaran design in about the size I am lookng at.
I have thought about a Mono of about 5.5 meters with 140Hp and been in a couple but have been less than impressed with the ride. There are zillions of new and 2nd hand boats out there that will do the job you have described. If your main reason for doing this is #1 - because you want to - then do yourself a favour (and save a lot of heartache & $) and go buy a set pf plans from a reputable designer.
Look at it this way: for your design, you have used the quantity of aluminium surface that would do for a 7.5 m monohull with really fine seakeeping qualities!
Sorry to ruin your dreams, but I speak from experience of designing and building both mono and cat workboats in alu to very stringent specs. I do not have any first hand experience with the boats but I stumbled across the factory when chasing some welding consumables a while back. There have been some nice boats designed from scratch as you are aiming to do but it is a steep learning curve to get it close to right. Might have to go back to me original plan of building the Boden Alloy Sea Boat at 6 meters. Location: South Africa Little Brak River Trailable Electric Catamaran We all will agree that I have to work on the looks of the boat, it looks at present like an ugly duck.
The 60 cm diameter and 6 meter long double cylinders should give me some 3000kg before the cylinders are under water. There will be only 2 electric cables a plus 48 Volt and a minus 48 Volt and the controls will be done with a CAN bus and radiotransmitters. 2) C is the central hinge which will be after lowering of the Cabin bolted onto the keel of the Cabin. 7) L is the guide which makes sure that studd G keeps the boat stable when the Cabin is lowered or lifted.
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. Location: Pretoria South Africa Catamaran for Jules Hi guys I had posted this info on another site, which will close, so I am going to tranfers all the details here. I addapted the basic concept for our local conditions and the availability of local materials, all of which is problematic is South Africa. I did the hull modelling in freeship, to establish the kind of resistance values that we wanted for a hard chine design and also to get the development co-ordinates for the hull plates. Many bridges to cross - many problems to solve - but what the heck, if you dont go for it you wont have it. I have gone for 16 mm at the bottom and 12 mm on the sides, it is very heavy, but our conditions is dirty water and I wanted the 16 mm at the bottom to support mini keels, dagger boards are simply too dangerous here. Jules lives about 2 hours away from me by car, so you guys will understand that it is not that easy to get there, and when I do get there we obviously have to cover as much as possible in a day. I am very blessed to be very busy at work and all my free time gets devoted to my own building of my micro. So as the economy is still shrinking in Saffa at least there are these two projects still going along strongly. Location: Pretoria South Africa And here are the pics that went with it all.
I really enjoy following build threads and seeing projects come to life and I can't wait to see even more.
The hulls are perfectly smooth on the outside, Jules employed a professional auto guy to come in and flatten and sand.
Jules is working on the interior to suit his own personal needs and I must add that he is not going overboard and thinking about Golden taps and other ridiculous ****.
Location: Pretoria South Africa Well I finallly had a chance to get down to Vanderbijlpark to see Jules.
8m - (4.8m beam) is relatively short for a cat with 600mm bridge deck clearance and 1,8 headroom in the cabin but the real bonus is standing headroom in the hulls. As a weekend cruiser she will be very comfortable and she will fullfill her intended role with style, definately a fun boat coming together nicely.
The factory is relatively small so the problem is I cant stand back far enough to take pics. Location: Pretoria South Africa Boatfan thanks for the PM - dont know why but I cant send messages to you or reply - it says you have blocked PM's and mail.
Just on the Mini - Cat 5m I donated the hulls to a friend and dont know what happend after that. And as you have seen from my blog and my YouTube channel I am having a ball cruising around our local dams. Bottomline is that for us here in Saffa - dont touch anything but marine ply - the other stuff doesn't work - we have tried many times.


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.
It has the capacity to carry 4 people and comfortably fishes 2-3 people with the large front casting platform and rear deck.
Whether you're researching a new boat, or are a seasoned Captain, you'll find The Hull Truth Boating & Fishing Message Forum contains a wealth of information from Boaters and Sportfishermen around the world. It isn't pretty but laying out on the deck in a zero gravity chair sure looks like a good way to spend an afternoon.
And (I mean no offense by this) they will almost all do it better than anything that you can design and build yourself. At that time they had a boat under construction in the factory and it was going together well.
I suspect that the propellors maybe not completely under water and I have to modify that part and come up with a better solution. After the cabin is lowered, a 2 inch stainless steel bolt is screwed securely at both ends of the cabin.
BoxCat was just a proposal, a spar-buoy by the route, design never completed, boat never built. The build is progressing well and I will be able to visit the site next week and post new pics. I am very pleased and honoured to be able to announce a beautifull project that i am involved in for my client, Jules.
It is a bridge deck cat 8m long and will primarily be used for weekends sailing on the Vaal Dam. I then imported the DXF files to CAD There are obviously discrepancies that creep in but nothing that cannot be fixed with a little thickened epoxy. Anyway I went down Saturday early and we got stuck into a sort of training session for the day - coverring all aspects of epoxy. Taking the meetings, discussions, travelling and other time wasting factors into consideration I can loft and cut hull panels in a couple of hours while you are stuck in traffic and drinking coffee with your CNC specialist while he is waiting for the operator to set it all up. However if you want to experiment with this kind of thing you unfortunately will have to buy and learn a program like Delftship that can develop panels. Not crying, quite happy BUT my business is seriously interfering with my hobby and of course the building of the microcruiser is also suffering. This small bridgedeck cat of Jules obviously has a universal appeal and the guys at the yacht club are full of praise for it. An 8m cat is a bucket load of work, but he is chipping away at the block on a regular basis. I must just advise you as well get the boat on the water so that you can motor around and have fun, mast and sails can come later. It is very poor quality but has got that black waterproof glue that is used on marine ply - I cant remember the name of that glue.
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.
The boat rides excellent in extremely shallow waters and runs well in the moderate chop due to the tunnel hull design.
The low gunwales make the 16 Cat an excellent boat for fishermen that like to travel to a destination, then get out and wade. A choice of 2 different consoles is standard or you can opt for a raised console allowing for extra storage or an in-deck fuel cell. With these tunnel sides, I would say that you need a tunnel roof clearance of ~5 % of WL length fully laden. Only after I have solved that problem I will worry about the rudders, but with 2 motors, steering could be done by manupulation the speed of the motors. The panels are hand lofted and hand cut from the cutting co-ordinates from freeship plate developments program.
Be warned it is a ***** to learn and will drive you to drink and at times suicidal - but in the end its great fun!
So when it gets launched Jules is going to have his hands full with many strangers coming up for a look. Hope to meet you soon Manie - let me get away with my Carolina and we'll have a get together. Have you used any exterior ply in your builds, and if so, where can I find good grade exterior ply? 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. Shape of forward parts of hulls and tunnel roof are lacking reserve buoyancy and dynamic lift capacity; she will dive deeply into wave slopes in following seas! The lowering and lifting of the cabin will be done, either by 2 reduction boxes with motors which pulls a 360 degree loop cable up and down . The cylinders all have small manholes to enable to mount all bolts for the stainless steel pipes.
The cost for cabling is substantial more than those inexpensive microcomputers with radiotransmitters and receivers.
I have the greatest confidence in his abilities and for a first timer he is full of enthusiasm. Today I know that the hulls are the easy part - fitting a boat out and decking it - is a HUGE amount of work. 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. I think you really need to look into the bay boat train of thought, will handle the chop better than a skiff. You must be capable to produce a realistic weight estimate before you enter a catamaran project, in particular if you are going to use her in open sea!
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.
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. 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.



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Comments to “Catamaran boat design software ipad”

  1. rocker  writes:
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