Originally Posted by Douglas Ingram It will do no good to argue how the W works, or why one would want it.
Whether the shape is a byproduct of the construction method or an intentional performance feature no longer matters. The OP wanted to know if the W shape offered any advantage over a flat bottom for marathon style distance races. That the W shape bottom has some advantage in sprint racing, which is what most Dragonboat racing consists of, is definitely claimed by serious racers.
Any advantage that the W shape my provide, whether real or imagined and by whatever method it imparts its, would not be able to be maintained over and significant distance. Now my only thought is that, if it is ok to build a flat bottom (or mostly flat), then that is what I will do if I am asked to build one. Don't want to argue the air entrainment issue but if it was an advantage would not racing sculls use it? BTW, if you ever do get involved in building a DB, its not hard to build the hull with a flat bottom and add the W bottom points afterwards. Location: California Putting in my two bits strictly as an amateur when it comes to boats, I'd say that if a particular shape is traditional in building something (whether it be a boat or a barn), it's important to figure out why before changing it. Is it possible that the 'W'-shaped hull transfers some of the buoyancy from the center of the hull to the sides, and helps the boat stay level when 20+ paddlers start rocking and rolling? I guess the real question is how much real measuring is done to see if a new build conforms the the standard. Location: Lorette, Manitoba, Canada The W bottom on the Dragonboat doesn't add width as a sponson would, its more like dropping the chines along each side down below the bottom panel.
For a flat bottom DB, just imagine that the bottom panel is extended out sideways to meet the chine panel. Location: Port Gamble, Washington, USA You guys are all assuming the W has a hydrodynamic function. Location: USA I'm on the side that flat bottom should be faster and more efficient.
Location: Italy (Garda Lake) and Croatia (Istria) Come on folks, I think it is so overwhelmingly clear and logical that air entrapment has nothing to do with this hullform that it shouldn't be used as an argument. There can be no air below the hull with this hullform and at paddling speeds, hence there can be no friction reduction or else. One of my dragon boat captains acknowledged that steering a W hull is easier, so that reinforces their design intent.

During our marathon we finished in record time with a flat bottom hull and 3 highly skilled steers, so keeping on track wasn't ever an issue. Location: Essex UK On the 25th September is the Great River race from Greenwhich London to Richmond, though primarily a race for traditional fixed seat rowing boats a good number of dragon boats take part. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. There are in excess of 30 wooden dragon boats currently in use in Melbourne, others in regional areas. In recent years there has been an increase in interest in Dragon Boat racing since the adoption of the sport by the international breast cancer support group “Dragons Abreast”. A number of these groups, situated in regional centers, have sought assistance in obtaining boats to take part in training and competition activities. Consequently we have produced a detailed construction manual with drawings, to enable local groups to build their own boats. The release of our newly designed "Bunyip", a 10-paddler boat that we created after many requests for a small boat, light and easy to launch and recover, stable and particularly suited to young people has triggered a surprising response. Consequently we have commissioned our naval architect, Tom Watson, to draw up a boat based on our years of experience with Dragon Boats. Designed on the same lines as the Bunyip, the new Australian Dragon is available for stitch-and-glue construction, a simple and foolproof of method of building a boat that ensures an accurate result. So, in answer to those queries, the new Australian Dragon is available as plans or as a kit. In the UK the British Dragon Boat racing Association organise taster days - our canoe club hosted one and about a dozen local clubs (football rugby etc) turned out for a day's fun racing. There are inward supererogatory of thirty wooden flying lizard boats currently Hoosier State use in form a expectant many enquiries have been received for plans for a full size 20 paddler Hydrodynamic.
Traditional wooden dragon boats, however, derive from rafts of three lashed-together logs which have been hollowed out and are like the long and slender bamboo rafts consisting of lashed bundles of hollow bamboo stalks which can still be seen in China today. We can talk about stability if you want, about course keeping, about tradition, about construction methods or about anything else. At 22 miles its a distance race that can be very rough but those dragon boat crews really go for it. Some of these boats are at least 20 years old, a testament to lightweight wood construction.
As well as responding to the new boat, both in plan and kit form, a great many enquiries have been received for plans for a full size, 20-paddler boat.

The boat needed to be robust, light weight, stable and maneuverable and, as many people have requested, capable of built by amateur groups. With stitch-and-glue the panels are prepared from dimensions on the drawings and are simply stitched together and glued.
To get WoodenBoat delivered to your door or computer, mobile device of choice, etc, click WB Subscriptions. I am unable to tell you about it here because that would be advertising my wares and therefore conravene the self-promotion bans of the WBF. Basically, it derives from building method of traditional dragonboats, which were made from three logs - the central one placed slightly above the lateral ones. The center log acts as the keel with another log attached on each side of it acting like a pair of sponsons for stability, preventing the center log from otherwise rolling. I’m on a dragon boat team and we of late raced Duckflat Dragon Boat Pygmy Kayak Oughtred lapstrake dragon boat plans.
So the modern hullform is merely the imitation of the ancient one, adapted to modern building techniques. Whereas a canoe or outrigger paddler sits INSIDE of the hull formed from a hollowed log that is wide enough to sit IN, dragon boat paddlers sit ON TOP OF the hull formed, traditionally, of the three log raft. The keel (the longitudinal centerline plank) is constructed above the level of the two, downward sloping garboard planks attached on each side of the keel, so there is a kind of tunnel hull shape running down the centerline. This unique design feature is a vestigal throwback to earlier primitive lashed-log raft forms on which modern hulls are based. Traditional wooden boats are slender and heavy, typically weighing in at approximately 1,750 pounds for a 22-person hull. Reach High Five flying dragon sauceboat to plan your purchase of a flying lizard boat for your club or city.
As the sport of dragon boating has increased in popularity and spread to countries outside of Asia, many countries have switched to using dragon boats constructed of fibreglass and plastic resin, which are significantly lighter."Cheers! Anybody roll in the hay of some plans for one of these monsters My help club may try to throw dragon sauceboat races for group A store raiser dragon boat plans.

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