I make had a few emails regarding the plans I drew upward of the small Dumas V soh I thought some of you might want to try out this small 18 We convey equipment for Remote Controlled Fast Electric manikin. There are lots of things to consider when you decide to buy an Rc boat for the first The similitude hull design makes it both faster and so type A deep vee with the added. Location: Venezuela boat hull design (pad design) Hello, my name is Cristian,this is my firth time here, and i would like to know somebody hellp me. I have a powerboa 16? vee fiverglass 22? 140hp looper, and i like to put in it a pad but i don?t know the dimensions (size), and how it comport in the boat, i have very much time driving boat, but never with pad, and i need the pad for more speed and woul like to know about the size of a box of water that the people do for blow off in final of transon and bow.
I'm not familiar with the calculations for retrofitting an existing hull with a pad; most boats I see with one have it built in from the start. Location: Venezuela thanks matt, bu i like to know what is small size in inchs. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. 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. Location: brighton Hull design - CAD drawings Hi, I have a hull design that needs some advice, it's a Cat with a Hydrofoil to be made in GRP from a mold. Location: Maryland Catamarans and trimarans have been built (Westamaran, Fjellstrand, etc) that operate as fully foil supported high speed vessels, with varying degrees of success. Location: Australia If the intention is to have it entirely foil-supported at speed, what control will there be over trim ? Originally Posted by BMcF Catamarans and trimarans have been built (Westamaran, Fjellstrand, etc) that operate as fully foil supported high speed vessels, with varying degrees of success. Originally Posted by Mr Efficiency If the intention is to have it entirely foil-supported at speed, what control will there be over trim ? Originally Posted by congellous Wing tip flippers and a mid propellor but this is very much a draft proposal I'm looking for general advice on the shape and feasibility, cheers Umm - have you done any measurements, displacement, weights etc at all ? There is no point discussing feasibility and shape unless you have a bit more than pictures. Originally Posted by rwatson Umm - have you done any measurements, displacement, weights etc at all ? Originally Posted by congellous I wondered wether it could be used as a hydrofoil at slow pace just to save drag as it's an uneconomical shape ? We built and tested a trimaran that was assisted by fully submerged foils such as you showed on your sketch. But we've also been involved in foil-assisted projects where the vessel never made it past the drag hump and foils were only a source of excessive drag. Originally Posted by congellous It's not going to be used on the seas, however, it may be transited like a barge and maybe moved around in coastal waters. At lower taxi'ing speeds it doesn't matter that much about the drag and it would provide a stabilising effect I assume.
Take off as low speed as possible, I have read a few threads and know that there are issue's. It's 10'6 beam and 41'4 length, enough speed to get it onto the foil is all that is needed and otherwise just walking pace. Originally Posted by congellous Hi, I have a hull design that needs some advice, it's a Cat with a Hydrofoil to be made in GRP from a mold. I'm open to suggestions on the props and yes some tried and tested foil design, nothing fancy needed, it's not a performance boat, timid little cruiser. Originally Posted by BMcF Given the hull shape and intended use, perhaps you should look at adding skirts fore and aft and pressurizing the cavity between the hulls with a small centrifugal blower. Originally Posted by congellous I might even drop the hydrofoil idea, however, I was wondering wether the channel between the hulls could be shaped to entrain the water to a central propellor ? Location: Australia Channelling the water, which will be aerated, into your propellor I would doubt would be prospective. 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.
I thought I would offer up a 22ft hull for anyone who wants it (see attached picture, Rhino and ACAD files).
I would appreciate if someone with experience of this size and type of design would comment on it. It is not my skill but rather that Rhino (that I used for this hull) is really good at making developable surfaces. Location: LA Developable surfaces Houndie check your version of Rhino, they had a bug un-rolling surfaces until release 3, SR3c.
Location: LA 22 dev hull Jeff, I did a quick loft and un-rolled your bottom plate, see if your version of Rhino reads the attached file.
The increase in size when you develop a surface should not be a problem but I am no expert on this. I less suspect the accuracy of the computer expanded plates as much as the nature of hand building hulls without stiff jigs.
Click on the thumbnails to download the disembarrass plans to body-build a seventy-two inch rc boat hull designs. Hull Length at water line (Lwl) - Also referred to as DWL it is exactly what it implies, the length of the hull at the waterline. To remember this I thought of when the bow goes over a large wave and it dips down it's bowing down to the ocean.Stem or Prow- The forward part of the bow usually at centerline, not used much these days as it came from wooden boat building. 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. User ID - guest, password - guest) and you can access our FAQ, manuals, and tutorials for all programs. I still draw the basic shapes by hand and transfer them using points into Ashlar-Vellum Graphite ($995). The idea is it floats pretty much on the waterline but has the stability of the two submerged hulls and then at lowish speed starts to lift out onto the foils.
Only once you've lifted the hull nearly clear of the water is the resistance potentially decreased relative to the bare hull. 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.
It is simple and rather straight, 16deg deadrise, outboard hull with developable surfaces (plywood or alu). I made an effort to use low degree curves to create the surfaces thereby it is easier to keep them fair. Also, you cannot fair control points on the surface membrane stretched between two curves without making it non-developable.
Saying its a cone is a little simplistic, see the graphic where I projected the side shell past the chine and sheer of my deeper vee hull. The deviation should be absorbed by most manufacturing process tolerance, I would guess even if you used a CNC machine. The bow waterlines could be slimmed by moving the forefoot aft or a more gradual turn up from the keel.
Such assembly precludes the attainment of the tolerance of the NC cut parts during field assembly. According to the design of the hull gas constant coke boats whitethorn be classified in two main types single-channel are those hulls which can surface offers type A continuous wet surface.


Boats Trucks Cars and Planes including It has been over 10 years sinc rc boat hull designs. Now you may be thinking that the waterline will probably change if you load the boat and you'd be right but the waterline in this case is the waterline where the designer intended it to be not where it is once you have loaded the mother in law.
Prow is the bow above the waterline.TransomKeel - A structural or hydrodynamic appendage at usually at the bottom of the hull.
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. If you design the tunnel correctly, it will actually get some uplift from the air compressed into the tunnel at speed. 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.
Also the surfaces are of degree 1x4 (using 2x5 control points) which is key to make them easily developable. The expanding plate question is a good one, I have done a lot of large aluminum hulls and do not provide shell plate geometry. Plan1 Offshore Large Scale RC Boat plans 72inch kissing disease Hull Plans RC Monohull Plans. A ships hull is built around a large beam or steel plate which is the structural keel, the backbone if you will. 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.
It's a river boat hull so the proportional shape is fixed, following reading on here I thought I'd make it a Cat and then wondered if it could even be a hydrofoil from the video's and design data. Once the vessel exceeded 14 knots, the speed would then quickly come on as the drag reduction benefits of being on foils became apparent.
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.
The best way to process a developable plate hull is to fair the sheer, and chine (or chine to keel), loft a surface between the two and leave it alone. When I did this edge extension to yours it twisted which is ok as long as those lay lines don't twist or intersect within the section of the plate you are trying to un-roll. In a monohull sailboat a keel serves two purposes keeping the boat upright (provide ballast) and as an underwater wing for resisting side motion or converting to forward motion. On multihull sailboats the keel's then to be small as it is not neceassary to hang a large lead weight off the bottom to keep it upright. 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 have seen many designers try to get flair into the bow of a developable hull since they appear to bow out. For speed calculations using displacement use the maximum displacement.Hull Draft (T) - The vertical distance from the waterline to the bottom of the hull.
Hull Transom - The surface that forms the stern (back) of the vessel.Hull Chine - A sharp (or sharper) angle on the hull, this is more pronounced in planing hulls, power boats, where a hard chine is a sharp angle and a soft chine a smoother angle.
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. Its just due to the bow shape being a portion of a cone, which is single curvature and the only surface it will accept to create flat patterns. I would like to hear others opinions about how much luck they have had with building from a computer shell expansion.
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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