How to design a sailboat hull quebec,1988 lowe classic pontoon boat,boat seats victoria bc 2014 - How to DIY

Published 16.08.2014 | Author : admin | Category : Wood Boat Plans

Location: San Francisco It looks like a piece of crap with negative value, to me. The keel is weirdly tiny, and it looks suspiciously like someone has hacked out part of whatever it was made of first and replaced it with a hunk of lead(?) in a (probably hopeless) effort to make the thing stay upright.
If it had actually sailed at one point in its life, it might be a fun project to bring back to life -- still a big financial loss, but educational and fun if you're in to that kind of thing. Location: Cathlamet, WA It looks like it could be a John Brandylmeir (sp?) design. Location: San Francisco Out of curiousity, what makes you think it's a Brandlmayr design? I poked around, and all the designs I found seemed to favor a more traditional sheerline and rather more rake to the stem. Location: Cathlamet, WA While sailing near Campbell River about 35 years ago a 24 foot sailboat designed by Brandlmayr sailed by us quite handily on a similar sized boat.
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When making potentially dangerous or financial decisions, always employ and consult appropriate professionals.
The aspect of boatbuilding which seems to be most terrifying to the amateur builder (and sometimes the professional) is lofting the lines.
This is an irrational fear, probably born from the mystique which the professional loftsman has been known to wrap around his craft to protect his position. The aspect of constructing a boat which seems to be most terrifying to the amateur builder (and sometimes the professional builder tooling up for GRP volume production) is the lofting of the lines. The intimidated prospective builder will do everything that he can to bypass the lofting operation and is at his happiest when he is able to start his construction from full size hull patterns. There is nothing wrong with building a boat from full size patterns as long as the design was not chosen because of the full size patterns.
Lofting time for a design will vary from a day for a single chine hull to maybe two weeks for a large and complicated round bilge hull.
Many design offices now use computer aided yacht design facilities which include mathematical fairing of hull shapes with a high degree of accuracy. It has been stated many times in the boating media that one can tell which yacht design software package was used to design a hull by looking at it's shape and that one can see which designers are using the same software.
If the design which has been chosen does not include full size patterns or computer generated offsets, it will be necessary for the builder to know how to convert the information supplied to him in the form of the lines drawing and table of offsets into the final hull form. The lofting operation is essentially a process of drawing out the designer's lines drawing full size on the floor so it is important that the lines drawing be thoroughly understood. The drawing shows three views of the hull, in this case each occupying it's own section of the drawing. The side elevation shows the boat as if it were being viewed on the dock, with the sheer line being the extreme upper edge of the hull and the profile line forming the lower perimeter of the hull from stemhead to transom, usually along the centreline for a monohull. Most hulls will have buttocks which are gently curved in the bow areas with some flatness in the lower areas aft and fairly tight curvature in the topsides aft.
The plan view shows the boat as if it were upside down with the viewer looking down at it.
A fine bowed boat will have waterlines at and close to DWL which are straight lines in the bow area and meet the centreline at a relatively small angle.
The waterlines are the best indicators of the up-wind potential of the hull, telling the eye whether the bow will cut cleanly through headseas with little effort or require a lot of brute force to push the seas aside.
The end view of the hull is known as the body plan or the cross-sections and is sometimes drawn superimposed over the side view. The body plan gives the clearest picture of the overall shape of the hull with regard to stability characteristics and seakindliness. On the lines drawing is a grid which forms a background to the lines of the hull and, on inspection, it will be seen that the grid for each view is different from that of both other views.
To confuse the reader, the section lines on the side and plan views are not called sections but are stations. The usual method of referencing the stations is for station 0 to be at the point where the profile line in the side view crosses DWL at the bow and station 10 at the point where it crosses at the stern. The section of hull ahead of station 0 may include a negative station or two but is more likely to have some dimensions on the drawing to define the curve. Waterlines are numbered or are referenced by their distances above or below DWL or, sometimes, their distances above a base line.
On the body plan there will normally be one or more diagonal lines (Diag A to Diag C on the drawing) which are usually referenced alphabetically. The principles of a lines drawing for a single chine, multi-chine or radiused chine hull are similar to those described above for round bilge yachts.
Fig 2 shows a line drawing for a multi-chine hull with fin keel, transom hung rudder and planing boards. On the multi-chine lines drawing are four broken lines running from top tp bottom and referenced A to D. A single chine design which has a large amount of twist to the panels (change of angle from station to station) will probably have conically developed surfaces. The table of offsets which accompanies the lines drawing is a tabular representation of the body plan, ie a list of measurements.
Fig 3 shows a table of frame offsets for a motor yacht hull with two chines, the lower one being radiused so it has been called a ghost chine. Hull Design software I have designed a 4.9m cat on graph paper and I want to design it using CAD software. Location: Cudjoe Key Fl Tom, I went through this software thing for a number of years, and finally realized the only good boat design software is a large piece of paper and a sharp pencil! Location: Denmark Personally, I also prefer to do it the old-fashioned way, but I must admit that it is by no means better than using a computer - only slower!
Software for small craft engineering is available, but probably not for craft of the size you mentioned.
The price of $150,000 that BillB mentioned is ridiculus, but you must be prepared to spend up to a couple of thousand, though (I should mention here that there are free- and shareware available, too - search for Hullform or PolyCad).


Location: MX Hi Tom, Bill is correct up to some degree, be sure of what you are looking for (or what you want to achive with the software results wise), this softwares are usefull but they are not magic boxes that you ask and they respond, so one quick response could be prosurf and rhino, it has worked for me, and they do most of what i need, this is for hull shape and interior detailing, other good one is hullform and rhino, hullform the pro version is quite complete, it may be little bit harder to use IMO, and again this is for hull fairing and lofting, stability (initial with rhino and prosurf) and complete with hullform, other people will be able to give you their opinions.
Location: Perth, Western Australia I have to comment regarding Bill's statements about the high cost and complexity of modern CAD systems. Similarly, Maxsurf was the system of choice of 7 out of 10 of the syndicates involved in the 2003 America's Cup. I do not disagree that designing with pen and paper is a perfectly valid way of creating a hull shape, but it is slow, difficult to calculate volumetric properties, and inherently inaccurate, requiring the additional step of full sized lofting to create accurate lines to build from. Rather than imposing a fixed style on designs, I would argue that computer aided design methods have resulted in a greater degree of artistic freedom in the design of hulls and superstructures, particularly on luxury yachts that have gone from relatively simple shapes 20 years ago to a wide variety of more organic shapes, made possible by powerful surface modelling software. The pic below, a design by Brett Bakewell-White of New Zealand, is a good example, initially modelled in Maxsurf with further detailing and rendering in Vellum 3D. I must mention again, there is a BIG difference between Design software and Engineering software. Back to the reality of designing craft under 100 feet, which are considered small craft by all marine architects, sure one can figure out what size screws to use by eye, or state what thickness the bulkhead skins should be but I have never seen any Boat Styling software come close to doing this. As far as pencil and paper and clay models, this has worked for a hundred years, and is 100% accurate. On the contrary, Fastship has a relatively small number of integrated tools compared to Maxsurf. On the other hand, the Maxsurf suite consists of many well integrated applications using common files and a common user interface, all developed by my company, Formation Design Systems. Like Fastship, we rely on programs such as ShipCam for downstream structural design and production, as this is an area that we consider to be outside our area of expertise, however Fastship has no equivalent to our preliminary structural design program, Workshop. I should also correct the impression you give that Maxsurf is for small craft and Fastship is for big ships. Location: Cudjoe Key Fl Andrew, now that is the reply Tom is looking for, among the rest of us! You may want to consider drawing and fairing your hull in a CAD program, not a hull design program. Would this vessel have to be a hydrofoil or multihull, or could a monohull with a hinged transom of sorts convert a double ended full displacement hull to a squared off planing hull? Location: Australia Displacement-type cats probably the most likely candidate for a boat that can operate efficiently over a wide speed range. Location: Australia If such things were easy, or practicable, or affordable, they would have arrived on the scene by now. Location: NW Washington State USA One way to do it would be to hull a bit like a Handy Billy that at a bit less than hull speed would have her transom out of the water and present an excellent full disp hull form to the water. Location: Sweden As far as I've understood there isn't really a maximum (displacement) speed for long and narrow hulls. The performance of any boat, and especially a multihull, goes out the window if you overload it. Location: Everson, WA From the thread, I am leaning t'ward a catamaran with hyper narrow, deep hulls. Location: Australia There is no miracle design that will do everything better than all others. The subject of efficient power boats interests me, especially in the 10 ? 20 knots speed range. If fuel efficiency is the only criteria and length is not a restriction, a long and narrow monohull is the answer. A conventional trimaran has stabilizing amas that extend outside the sides of the hull proper.
Another variant on the stabilised monohull theme is the displacement glider, also called box keel boat. The underbody just looks wrong, and in the absence of evidence to the contrary, I think it IS just wrong. Neither the service provider nor the domain owner maintain any relationship with the advertisers.
I understand it will take a while to design it on CAD but I am deternined to design the catamaran using CAD software. And there is the added benefit that the software can do the calculations for you (hydrostatics, stability etc.) much, much faster than if done by hand.
The only reason why I'm considering purchasing CAD software is because all the most successful companies in the world, whether it is to do with yachts or to do with cars are using Cad software. Maxsurf costs as little as $700, yet was used to design the hull shape of Mirabella, the world's largest single masted yacht.
Each one of these syndicates could afford to choose whatever software they liked, and in many cases they were sponsored by major CAD vendors, yet they chose to pay full retail price for Maxsurf. As a result, few of todays professional designers still do things by hand, and more and more use computer systems such as Maxsurf, and are more than satisfied with the results. Maxsurf and the like, are fine programs for small craft, and making beautiful displays, BUT they don't ENGINEER the boat! Remember you the draftsman are creating the exact cut lines this way, the computer is always off by some. Proteus, the authors of Fastship, rely on GHS (by Creative Systems) for their hydrostatics and stability, NavCad (by Hydrocomp) for their resistance and propulsion, the US Navy SMP program for their seakeeping analysis, and ShipCam (by Albacore Research) for detailed structural design. Maxsurf is used by shipyards of all sizes, including installations in 5 of the biggest shipyards in Japan - Mitsui, Mitsubishi, Kawasaki, IHI and Sumitomo.
Admittedly, in Maxsurf you can set the tolerance to which curves are calculated, and the default is 0.2mm.
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I still draw the basic shapes by hand and transfer them using points into Ashlar-Vellum Graphite ($995).
I've seen the HYSUCATs, and would like to get feedback on a trimaran (HYSUTRI?), or another hull design. Transom extensions might make some theoretical sense, but in practical usage, transitioning from one mode to the other, on water, would likely be problematical.


But because of her rockered bottom w more power she'd pitch up, squat a bit and have a submerged shape much more like a planing hull and go gracefully at speeds much higher than disp. I guess that this is because it is easier to make a practical boat with a catamaran hull than with a trimaran hull. Ultra narrow catamaran hulls might be attractive for their minimal wave-making resistance, but cause hobby-horsing running into a sea, as well as being very sensitive to fore-and-aft weight distribution. I estimate that the boat that fits my requirements has a displacement around 4 tons, so I?m looking at long and narrow hulls used in displacement mode. The platform connecting the two hulls needs a clearance of half a meter or more to the water, to avoid waves slapping into the platform. This arrangement complicates handling in harbours so I?ve ruled out a conventional trimaran for myself. The box keel provide maybe 80% of the buoyancy, provide standing height in the forward cabin and can accommodate engine, fuel, water and technical installations.
My hope is that such a boat can be made in the spirit of the beautiful power boats designed by CG Pettersson during the first half of the 20th century. I'm a cabinet maker by trade and not a boat builder but this looks like a well built hull and deck that I am considering picking up and working on but no plans are available and the original builder has passed away so there is no information available to me as to the design.
In case of trademark issues please contact the domain owner directly (contact information can be found in whois). Software that they have actually developed from scratch in-house consists of Fastship and Maestro, their excellent structural analysis package. The enclosed photo is one of the most recent vessels constructed using Maxsurf and Workshop, one of the largest container ships afloat. If you think you can cut and build more accurately, you can always set the tolerance finer. A tri could cruise on a small diesel in the center hull and have big block chevrolets with jet drives in the outer hulls. Hydrofoils sound great, until one hits anything more solid than a duck and somersaults into oblivion. Gracefully that is excluding the fact that her bow would be ungracefully high in the air, subject to winds that could make a mess of directional stability.
From boat data I've seen, and my own calculations using Michlet, long and narrow hulls are used at speeds up to around 20 knots for a 12 m long boat.
I wouldn't count out a mono-hull Tlinget or Otter types either (people in the Northwest will know what I'm talking about). If you also want a useful boat, a monohull has to be considerably longer than 12 m to provide an acceptable beam. Anything you build on the platform will have quite a high CoG so you will need a minimum total beam for the catamaran of 3 m - 4 m for stability and to avoid excessive wave interference between the hulls.
The clearance to the water for the hull spanning the distance between the main hull and amas still needs to be around half a meter with resulting high CoG. Its a little hard to start talking to people about rigging without knowing what to call her.
I have experience with computers but have only used very basic design software before for other reasons. So if these companies that have turnovers of ?500 million, then they must be doing something right!
Any SHIP BUILDING software costs many thousands of dollars simply because in itself, it is huge.
I am not using the software to design a 80ft yacht, I would be using it to design a 4.9m catamaran.
When it looks good on screen, I plot it out on D size paper and take a long hard look at it, just as I would by hand. The idea would be to waddle along at single digit speeds for maximum range, then roar over the horizon when the Somali pirates show up. First hand experience with a planing hull at displacement speeds proved to me that just pulling back the throttles does not save much, if any, fuel.
Michlet is based on theories for wavemaking that is applicable for long and thin displacement hulls and consequently is most relevant when wavemaking is the major resistance component. My search is for the hull(s) design that goes the fastest with the least power, then I can work on a compromise of accommodations, tankage, complexity, initial cost vs long term cost, etc. For adequate initial stability, the total beam needs to be more than 3.5 m for a 12 m long boat. I calculate the areas of the hull sections using the 2D Analysis tool, then I input the areas, waterline halfbreadths and vertical centers of the areas into a spreadsheet to calculate the hydrostatics.
If you go for planing multihulls you will sacrifice efficiency at low speed for a higher top speed, but the low speed efficiency might be adequate for your needs anyway.
The data LWL = 20 m, BWL = 2 m, draft = 0.5 m, displacement 12 tons approximately describes the minimum useful displacement for a monohull (for speeds around 15 knots). I just want a hull design software that will let me produce a professional hull shape with no major problems, but I don't want to spend thousands on the most high tech software out there. This works fine for small boats and you have the CAD program to detail the rest of the boat, which is really the bulk of the design anyway. A trimaran would have room for an engine in each hull, max range in the center engine, max speed with all 3 engines, and something in between on 2. It sounds good until factoring prismatic coefficients (and other formulas naval engineers have a total grasp on) for different speeds. A wise man once said the most efficient way to go through the water is not to go through the water, but the air instead, with as little of the boat in the water as possible.
I have had a bit of change of thinking about this recently, and will shortly be testing a new idea via some scale models, if it's got legs I'll post some news. The boat I have experimented with is unfortunately a bit too heavy to get a good response from, with the air cavity size it has.



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