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EntriesRig Options - SloopPosted: 03/03/05 |
Proas
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The sloop is the rig of choice on 90% of sailboats. Why not on proas as well? Here’s why. Rigging a proa as a sloop is a true blending of East and West. The proa is considered the pinnacle of Pacific canoe design, and the sloop is often considered the finest invention of Western "yachting". Brilliant in their own context, what happens when we creatively recombine their DNA?First consider the sloop. Beautiful, efficient, and handy, the sloop has been the darling of the yachting world for going on one hundred years. Refined over the years, and lavished with the latest hi-tech materials, the rig is versatile enough to please all-out racers and laid-back cruisers. When set up with a self-tending jib, the rig is simplicity itself to tack, needing only a gentle hand on the tiller to guide the boat through stays. When rigged as a racer, there are enough sails to change, winches to grind and strings to tweak to keep a large crew very busy. The rig works for small day sailors all the way up to 100' mega-yachts. Rig Options - SchoonerPosted: 03/02/05 |
Proas
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Cheers, perhaps the most famous Western proa, was schooner rigged. Since she was so successful, you might think that her rig had something to do with it, and you’d be right.
Though the schooner has several good points, the most important one as far as proas are concerned is the ability to vary the fore and aft CE (center of effort) by trimming the sails. This ability cannot be overstated enough, in my opinion. Proas are, by their nature, "rudder-challenged". That is, the necessity of shunting makes operating a rudder a problem. You may think that I am talking about the problem of shifting the rudder from one end to the other during each shunt. Though this is an issue, twin rudders, perhaps counter-rotating, at each end of the hull, can handily solve this problem. No, the bigger problem is that a proa must come to a complete and dead stop for each and every shunt.
As any sailor knows, allowing a sailboat to come to a stop is allowing it to get out of control, because with no water flowing past, the rudder is rendered useless. All Western craft are fundamentally designed with the unspoken assumption that the craft is NEVER to come to a complete halt while sailing. When this does unintentionally occur, the boat is said to be "caught in irons" - a colorful expression that illustrates the Western sailor's dread of the situation. The Case for the Steering OarPosted: 03/02/05 |
Contributions
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By Gary Dierking Steering is one of the great challenges of proa design. The one who finally designs a steering system that a) shunts easily, b) controls the canoe both while at speed and while stationary during a shunt, c) is hydrodynamically efficient, d) is immune to underwater hazards, and e) is simple and foolproof, will have discovered the proa “holy grail”. Could it be that the Pacific Islanders have already invented such a wondrous device? My first experience with a steering oar was not auspicious. In Coast Guard boot camp I managed to talk my way into steering one of the big whaleboats used for training and racing. We must have had all the strong guys on one side as my best effort was not enough to prevent ramming one of the other boats; causing an automatic disqualification and my demotion to rowing guy. It took quite a few years before I realized that a steering oar is much more than a rudder. If I had used the oar function I could have avoided the collision.
The Zen of ProaPosted: 03/01/05 |
Contributions
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By John Dalziel Testing With Models - IIPosted: 03/01/05 |
Proas
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From the Proafile Archives. Originally posted 1999 After my exciting but ultimately unsatisfying flirtation with anti-heeling Bruce foils for my proa scale model, I went out and bought my first computer. We all know what a huge time sink that is, so the proa and any model testing pertaining to it went onto a very remote back burner. This turned out to be perfect timing, since once I discovered the internet, I gradually found other people who were also interested in proa design and development. (All three of us!)
Testing With Models - IPosted: 03/01/05 |
Proas
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From the Proafile Archives. Originally posted 1999 After the disastrous first sail of my 26’ proa Rozinante, and after waiting a suitable time for my emotional wounds to heal, I decided I needed to do some research and testing. Research was easy, since there is practically nothing out there to read on proa design. One notable exception is the Amateur Yacht Research Society (AYRS) which has published many a paper about proas over the years, and is one of the few yacht design organizations that treats proas as a legitimate area of interest. I became a member post haste.
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