Anyone got opinions whether twin rudders always should be at 90 deg to the horisontal plane, or inclination has pros & cons? I am a thoroughbred rookie in boatdesign, (with a love for impossible missions and curves yet to be put on paper), so please feel free to come with hints and links. Boat Manual info sought » Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Search this Thread Advanced Search Similar Threads Thread Thread Starter Forum Replies Last Post Can I scan my model ?
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Fiberglass can be contoured to any desirable shape, resulting in more efficient hull designs. Southport Boats manufactures fiberglass fishing boats using an exclusive Hunt 4 hull design in Augusta, Maine. Yacht design concepts, custom hull designs, lighter and stronger materials are constantly changing in the yacht building industry. Fiberglass Boat Designs CAROLINA HULL Web site design by D4 Data Design HydroMarine of Germany Fiberglass Race Boats in white gel coat unless specified otherwise. I recently came across a 1999 48' Ocean Super Sport that had been struck in the transom by another boat. The boater who is looking for all-around use can make almost any hull design work for many water conditions. Some folks call these comfortable shoes I am wearing tennis shoes, athletic shoes or gym shoes, and I'm fine with that even though neither they nor I intend to use them for tennis, athletics or the gym. Eric: By the looks of the background in that photo, there sure are a lot of interesting boats up there. Refugio--- The most famous boat built from the plans pictured in your post was named Chinook and for many years it occupied the slip next to ours in Squalicum Marina. Chinook (the boat's original name) was built for a well-known editor of a national boating magazine, and he and his wife used it along the eastern seaboard for years.
It would be a worthy project of this forum group, and we should set aside individual patent protection ideas as unproductive in this collective effort. Location: Lakeland Fl USA There are, or at least were, just such an item as you describe.
It seems to me that more favorable result could be found by cleaning up the hull and all the deck hardware, loose lines, and the not inconsiderable drag constituted by several crew members scrambling about the deck.
Location: Port Gamble, Washington, USA Hoerner's Fluid Dynamic Drag has some German research on cable fairings. Instead of having multi-part tackles exposed to the wind, the purchase can be put under the deck (or in the boom) and only a single wire or high-tech fiber sheet exposed to the wind. If you recall the videos taken during the America's Cup, you saw that the running backstays were made in two pieces.
Two cables in tandem create less drag than one cable of the same total cross-sectional area.
Location: Port Gamble, Washington, USA Rigging is just one place to look for drag reduction. The total weight (and cost) of the boat is considerably lower as the beefing up required is very localised, and is a relatively simple tension load in the horizontal plane, rather than compression and bending in all planes. A free standing rig has so many handling and maintenance benefits that for cruisers it is a no brainer.

For racers, if the time and money put into stayed sloop rigs was put into unstayed rigs, I suspect it would also be a no brainer, and even if it wasn't the long term cost savings are more than enough to make up for any speed deficit for all but the absolute elite. The C class Quest III had solid foil shaped standing rigging connected through a series of pulleys, to the mast and always remained parallel to the mast as it rotated.
Originally Posted by messabout There are, or at least were, just such an item as you describe. Originally Posted by rob denney An interesting question, but I think your answer is heading in the wrong direction. Originally Posted by messabout And then there is induced drag where an object protruding into an air stream may cause more than obvious drag because of its proximity to another drag making body. Lets take a light to moderate displacement cruiser (maybe a cruising cat) with 50m of standing rigging excluding the outer forestay that carries the jib. I guess you would not be too devastated if you saw the fairing pieces gradually falling apart and falling off due to the ravages of sun, wind and water. For faster more easily driven hulls the drag on the standing rigging would certainly be of greater significance and worth reducing. Location: Oriental, NC Bruce Woods comments reminds me of devices used on instrument tow lines in deep water long ago. Location: South of Copenhagen, Denmark Here is some data on wire drag compared to rod rigging and a wire faired with an ellipse. Add a bit from flag lines, halyard, topping lift, say this equates to another 30 m or 138 N. This is the reason I'm going for unstayed masts, and specifically wingmasts, that when trimmed and sized correctly have less than 10% of the drag of a conventional mast.
Originally Posted by Nordic Cat Here is some data on wire drag compared to rod rigging and a wire faired with an ellipse. Tuna tower doubts » Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Search this Thread Advanced Search Similar Threads Thread Thread Starter Forum Replies Last Post Rigs and Rigging Weight vs Drag? Location: Texas Performance Pontoon Catamaran I am sure that I am missing the obvious, but why couldn't you use a set of aluminum pontoons to recreate a bigger metal version of one of these inflatable catamarans? The inflatable versions originated as surf rescue craft in South Africa, and have become popular racing sport boats. Does this sound more sound, or am I going to have another "what was I thinking" epiphany when my hangover goes away?
Location: Austin TX Recycled Hulls I like your idea of using the G-Cat hulls.
Location: Milwaukee, WI I am not sure an aluminum pontoon is heavier than an inflatable. Thanks guys, I plan on painting the whole thing boat and all just haven't gotten around to it yet. Trim tabs will help you keep your boat level, plane out faster at a lower speed, and will probably smooth out your wake. Trim tabs and wake plates are essentially the same thing: metal plates attached to the rear of the boat using a hinge and a hydrolic shock. They don't make the wake bigger, they actually push the rear end of the boat up and out of the water, which can help "shape the wake" making it less steep and more rampy.
Hydrofoils on the other hand are designed to pull the rear of the boat deeper into the water, which increases displacement, wake size, and steepness.

Trim tabs= 1 plate on each side of the hull to help plane or to balance uneven weight(more weight on one side of boat actuate that side tab down to lift the side with more weight to level the ride)A wake plate is a single plate placed in the middle of the transom used to shape the wake and slightly smooth the ride in chop.Really not the same,same mechanism different use. Anyone got opinions on sizes on rudders from models to fullsize (I know this is a problem on airplane scale-models)? Take two boats of identical weight, power them the same and the fiberglass For a one-off fiberglass hull, this process is even harder because the relatively soft Forming in Fiberglass was added to the Boat Design Hull design Fiberglass is just a non-starter for me. While fiberglass is flexible, there are limits on how much it can bend In fiberglass or composite hulls, the structure may resemble The shape of the hull is entirely dependent upon the needs of the design. Apparently the force of collision was The boat hull design is one of the most important considerations when choosing a What is the best way to paint a fiberglass boat hull?
The West Coast troller is a commercial fishing boat of a size and type that had great appeal to the cruising yachtsman..
I can't believe that in this modern age of new materials, etc, that we can't develop a 'shroud cover' that might 'wrap around' a piece of standing rigging and provide a superior aero-shape, and rotate to the most advantageous wind direction. Besides it might be difficult to find a manufacturer for this relativel small market of sailors, and in this current economy.
I came up with this discussion submitted by a rigging guy Randy Hough who appears very concerned about drag issues.
Pascoe, Marine Surveyor A wood boat is the sum of its many parts while a fiberglass boat hull is Seaworthy Hull Design. During the 1930s Ed Monk was instrumental in popularizing the original troller cruisers of the Northwest, and a skim through old Pacific Motor Boat magazines will show some designs by J.E. Most Trawling boats have a very specific design that is extremely stable and seaworthy in extreme conditions while towing very heavy gear. The extrusion was not joined at the trailing edge and one merely snapped the shape around shouds, jumpers or whatever.
Generally the drag is a function of the square of the wind velocity so perhaps the wire drag would be significant in a force eight but not worth much attention at force three. And while repairing holes or tears in the tubes is fairly straight foward, build a set of tubes from scratch is beyond the ability of mere mortals.
An offshore hull must be designed for both speed and a gear and equipment inside lockers and drawers, and shelves onboard a fiberglass hull Doucette’s Boat Building is family owned and operated serving the eastern seaboard and beyond with our custom designed 45 foot fiberglass boats. That design has been carried over into the recreational boat industry because of its sea worthiness. Drag due to interaction between two bodies in close proximity is known as interference drag. The full-scale will hopefully get twin props and rudders, either with two smaller engines or a V8, with the geared-up boxes, that sounds sweet (anyone tried them?). On the East Coast, trawler yachts were patterned after sardine carriers and swordfishermen. I doubt the the 0.5% reduction in power on the hull would result in measurable speed increase.

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