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Many guys are investigating whether to buy a catamaran or design and build their dream boat. Let it be said here that building a large catamaran is not for the faint of heart. People begin building s of boats a year, yet few are ever completed, as life always seems to have a way of interfering with a good boat build. Never the less, since the rest of this website is about selecting and buying a boatit only seems fair to have at least one webpage that covers catamaran design.

This page contains notes on boat hull design goals and an accompanying page from Terho Halme has mathematical formulas used in actual catamaran hull design. It has become a popular research stop and an important reference to the catamaran design community.

The content of this page was reproduced from catamaran building address group maestro of Catamaran designs, renown British naval architect, Richard Woods, who not only designs catamarans, he sails them across oceans�.

He has a lot to say on the subject of catamaran hull design. Of course, there are limits: Too much sail area capsizes the boat in brisk winds. If the boat is designed too light, she will buildding take any kind of punishment.

Too slim a hull design and the boat becomes a large Hobie Cat capable addres only carrying your lunch. Then there are lot of additional and very important factors catamaran building address group underwater hull shape, aspect ratios of boards and sails, wet deck clearance, rotating or fixed rigging and so on�.

We all know that multihulls can be made faster by making them longer or lighter or by adding more sail. Those factors are the most important and why they are used as the basis of most rating rules. However using just those figures is a bit like determining a cars performance just by its hp and curbside weight.

It would also imply that a Tornado would sail as fast forwards as backwards OK, I know I just wrote that a Catalac went faster backwards than forwards. So what next?? Typically this will be for a slow cruising catamaran building address group or the main hull of most trimaransfor a performance cruiser and for an extreme racer.

So buildlng and large faster boats have finer hulls. But the wetted surface area WSA increases proportionately as fineness increases for a given displacement the half orange shape gives the least WSA so fine hulls tend to be slower in low wind speeds. The most important catamaran design hull shape factor, is the Prismatic Coefficient Cp.

This is catamaran building address group measure of the fullness of the ends of the hull. But in fact you want a high Cp for high speeds. However everything is interrelated. If you have fine hulls you can use a lower Cp. Most monohulls have a Cp of 0. And that is about right for displacement speeds. However the key to Catamaran building address group design is you need a higher Cp if you want to sail fast.

So a multihull should be catamaran building address group least 0. It is difficult to get much over 0. So all multihulls should have a Cp between 0.

None of this is very catamafan or new. It has been well known by naval architects for at least 50 catamwran. There are various ways of achieving a high Cp. You could fit bulb bows as Lock Catamaran building address group did. Note this bow is catamaran building address group bit different from those seen on ships which work at very specific hull speeds � which are very low for their LOA.

But one huilding with them is that these tend to slam in a seaway. Another way is to have a very wide planing aft section. Finally you can flatten out the hull rocker the keel shape seen from the side and add a bustle aft.

That buiilding the approach I use, in part because that adds displacement aft, just where it is most needed. I agree that a high Cp increases drag at low speeds. But at speeds over hull speed drag decreases dramatically on a high Cp boat relative to one with a low Cp. In light winds it is easy to overcome the extra drag because you have lots of stability and so can fly extra light weather sails.

The time you really need a high Cp boat is when beating to windward in a big sea. But when you sail to windward the boat pitches. And here I agree with Evan. Immersed transoms will slow you down that is why I use a narrower transom than most designers. Why not chose a 60ft Americas Cup boat with a narrow out of the water transom?? But I catamaran building address group tested model catamarans in a big test tank and I know how inaccurate tank test results can be.

I cannot believe that a computer program will be better. It would be easy to prove one way or the other. One of the key findings I discovered with my tank test work was just how great the drag was due to wave interference builing the hulls.

One reason buildnig just flying a hull is fast the Cp increases when you do as well, which also helps. So you cannot just double the drag of a single hull and expect to get accurate results. And any speed prediction formula must include a windage factor if it catamaran building address group to give meaningful results.

About 25 years ago we sailed two identical 24ft Striders next to each. They were the same speed. Then we moved the crew of one boat to the bow. That is why I now arrange the deck layout of my racing boats so that the crew can stay in front of the mast at all times, even when tacking or using the spinnaker.

I once raced against a bridge deck cabin catamaran whose skipper kept the 5 biilding on the forward netting beam catamaran building address group whole race. He won. Richard Woods of Woods Designs www. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Skip to the content. Close Menu Catamaran For Sale. Catalacs For Sale. Catanas For Sale.

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It would also imply that a Tornado would sail as fast forwards as backwards OK, I know I just wrote that a Catalac went faster backwards than forwards So what next??

Tags Buying Catamaran building address groupDesigners. Owner of a Catalac 8M and Catamaransite webmaster. Leave a Reply Cancel reply Your email address will not be published.

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Catamaran Logistics Limited is a logistics management company providing specialized services to the national transport sector as a multimodal services company, Catamaran Logistics is committed to playing a leading role in developing and implementing strategies and processes for seamless integration of the various transportation modes: sea, rail, road and air � into a dependable and reliable multimodal system with strong impact on national economic performance.

Skip to content. Catamaran Nigeria Limited. Hudson Trident Limited. Hudson Trident Training Centre. LTC Limited. Intelligent Transport Services. As the panels are assembled onto the job you will need to apply glass tapes to the joins as specified in your plans. Panels can be surfaced and coated inside and out with high build while they are on the workshop floor to minimise fairing time once they are assembled to the boat.

The paint on the panels shown here has been kept back from the edges to provide a good bond for the tapes. Smaller items such as steps, seats and dagger cases are nested into the kit and for the more complex parts diagrams are provided to assist with the assembly process.

Interior kits can be ordered with the primary kit, or they can be ordered later when final decisions have been made about the interior arrangement. A compromise solution is to order the interior as a set of plain planels that can be cut to shape on site after finalising the layout.

The DuFLEX construction process goes a long way to minising the amount of fairing that has to be done, but inevitably any boat that has not come out of a female mould will require some level of fairing and surface preparation prior to painting.

The fillers and resin systems required for the fairing work are normally supplied as part of the kit. Hardware installation is the same as for any other form of construction using high density core inserts or consolidated laminate in way of fittings.

Go Sailing. Working with Duflex Kits. Flat panel construction for the surfaces above the waterline greatly speed up the build process. Using a DuFlex kit from ATL Composites or VDL Composites if you're in Europe ensures consistent high quality laminates and allows the panels to be easily joined on site with a simple glue join operation. See more about DuFlex kits on this link. Duflex Kit Construction in 9 Steps. Step 1. Kit Design.

Step 2. Step 3 Joining the Panels. Set up the work space where the panels are to be joined. If you are joining them with a clamping technique the space can be on the factory floor. A nesting booklet is provided with the kit to show how the panels are joined right. Joining the panels with clamping pressure.

Joining the panels with the Z Press. Step 4 Stacking Joined Panels. Step 5. Separating the Parts.

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