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18.05.2021, adminMany 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 catamaran building forum jacket the faint of heart. People begin building s catamaran building forum jacket 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 catamaran building forum jacket 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 the maestro of Catamaran designs, renown British naval architect, Catamaran building forum jacket 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 not take any kind of punishment. Too slim a hull design and the boat becomes a large Hobie Cat capable of only carrying your lunch. Then there are lot of additional and very important factors like 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 catamaran building forum jacket 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 Catamaran building forum jacket went faster backwards than forwards.
So what next?? Typically this will be for a slow cruising catamaran or the main hull of most trimaransfor a performance cruiser and for an extreme racer. So by 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 a measure of the fullness of the ends of the hull. Catamaran building forum jacket 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 design is you need a higher Cp if you want to sail fast.
So a multihull should be at least 0. It is difficult to get much over 0. So all multihulls should have a Cp between 0. None of this is very special or new. It has been well known by naval architects catamaran building forum jacket at least 50 years. There are various ways of achieving a high Cp. Catamaran building forum jacket could fit bulb bows as Lock Crowther did. Note this bow is a bit different from those seen on ships which work at very specific hull speeds � which are very low for their LOA.
But one problem with them is that these tend to slam in a seaway. Another way is to catamaran building forum jacket 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 is 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 have 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 catamaran building forum jacket with my tank test work was just how great the drag was due to wave interference between the hulls.
One reason why 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 is to give meaningful results. About 25 years ago we sailed two identical 24ft Striders next to each. They were catamaran building forum jacket 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 crew on the forward netting beam the 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. Fountaine Pajots For Sale. Geminis For Sale. Lagoons For Sale. Leopards For Sale.
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Sell Your Catamaran Fast! Catamaran Selling Advice. Catamaran Sales Forms. Catamaran Catamaran building forum jacket. List Your Catamaran For Sale on catamaransite. It would also catamaran building forum jacket that a Tornado would sail as catamaran building forum jacket forwards as backwards OK, I know I just wrote catamaran building forum jacket a Catalac went faster backwards catamaran building forum jacket forwards So what next??
Tags Buying AdviceDesigners. Owner of a Catalac 8M and Catamaransite webmaster. Leave a Reply Cancel reply Your email address will not be published.
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