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Catamaran Towers

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 catamaran building address queue selecting and buying a boatit only seems fair to have at least one webpage catamaran building address queue 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 the maestro of Catamaran designs, renown British catamaran building address queue 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 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 catamaran building address queue 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 or the main hull of most trimaransfor a performance cruiser and for an extreme racer. So catamaran building address queue 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 catamaran building address queue catamaran design hull shape factor, is the Prismatic Coefficient Cp. This is a 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 design is you need a higher Cp if you want to sail fast. So a multihull should be at least 0. It is difficult catamaran building address queue get much over catamaran building address queue. 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 for at least 50 years. There are various ways of achieving a high Cp. You could fit bulb bows as Lock Crowther did. Note this bow is a bit different from those seen on ships which work catamaran building address queue 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 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 is the approach Catamaran building address queue 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.

Catamaran building address queue light winds it is easy to overcome the extra drag because you have lots of catamaran building address queue and so can fly extra light weather sails. The time you really catamaran building address queue a high Cp boat is when beating to windward in a big sea. But when you sail to catamaran building address queue 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 Catamaran building address queue 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 catamaran building address queue the hulls. One reason why just flying a hull is fast the Cp increases when you do as well, which also helps. Catamaran building address queue you cannot just double the drag of a single hull and expect to Catamaran Building Address Space 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 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 crew on the forward netting beam the whole race. He won. Richard Woods of Woods Designs www.

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We had sailed our first boat Wave Dancer for five years and had many adventures on the British Columbia coast. March, April and May were frantic months as we finished all the final touches: engine installation, rudders, windows, deck fittings, electrical, plumbing, mast, and rigging. For premium quality lifestyle that blends excitement, elegance and serenity with its unique and dynamic architecture, the Catamaran will definitely pave its way to be the next iconic residential building in the Kingdom of Bahrain. The beam between the strips at deadflat is 36 inches. August 22, September 22,

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