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If you're not sure of the difference between a deep-V and a tri-hull, this short video will explain the basics.
Part of the problem comes from manufacturers who are a bit overzealous with their marketing claims. About UsTexas Fish & Game is the largest and most popular outdoor publication in the Lone Star State. Multi hull boats are boats with more than one hull, usually either a catamaran (two hulls) or a trimaran (three hulls).
These types of boats can often be found in the islands of South East Asia and the south pacific. Catamaran multi hull boats are not only different to single hull boats because of the two hulls. Trimarans, as you would expect, have three hulls side by side, they are another variation on hull design in that the middle hull is larger whilst the two outboard hulls serve to stabilise. The conventional wisdom is that the dragon boat design necessitates that boat run flat for it to move fastest (unlike, say, a speed boat!). Other coaches think that the boat has a natural tendency to rise a bit more at the bow than at the stern when moving, so these coaches put a little extra weight up front to force the boat to run flat at top speed.
If you do 500m in 2 mins, your average speed will slightly exceed hullspeed, generate a big bow wave and the nose will have a tendency to point upwards. Results are not so surprising really because during the pull, the boat will exceed hullspeed and wave resistance will be high which causes it to slow down quickly.
The more weight, the deeper the boat sits in the water and the longer the waterline length will be.
Because the hull shape is symmetrical and the bottom curved (stem to stern), moving weight will not change waterline length significantly so has little impact on hull speed. But you spend a significant proportion of the stroke above hull speed, when wave resistance becomes a major factor.
Talks about using a tool to balance a boat that takes into account the distance a paddler is positioned from the centreline (presumably both fore-aft, and left-right). When preparing such a spreadsheet, don't forget to take into account the differences between boat designs.
Maybe people that have access to different boats can publish some dimension data in this forum. BTW, if your reply is simply "Principle of Moments" (or "Moment of Inertia"), I'm skeptical.
First, unlike the seesaw example you use in your link above, there is no fulcrum in the center of a dragon boat. Second, a seesaw is static, not dynamic; that is, a seesaw is not in motion relative to the land below it.
Buk is the only manufacturer that provided this information when asked (others appeared not to know). Regarding 4:41, you are quite correct that static calculations in a spreadsheet or software like dragon analytics don't take into account the dynamic movement of the boat. This boat also tilts to the right which will be due to slightly different action between left and right.
So the short answer is, balance your boat and understand whether you are nose heavy or not. The tool produces a balanced boat taking into account weight, preferred side and general area of the boat, but also allows the user to move people around afterwards to take into account all the other variables that need to be considered. January 17 2016, 4:41 AM - You are correct, being in water and moving does "dampen" the "see saw" effect but it is still there.
Please review the definition of "fulcrum." You misused the term in every sentence in your previous post.


By using so much vertical motion in your crew's stroke, you make the boat bounce and make the boat run less efficiently. Location: Eustis, FL I was under the same impression Alik, which is why I jumped all over him too. You need straight buttocks down there, or else you'll be creating a tremendous drag at high speeds.
Originally Posted by PAR I think the first thing that should be done is considerably more study into the basics of powerboat hydrodynamics, particularly planing hulls. Location: Eustis, FL You're dreaming at 20 Knots and if you don't know why, then my previous post (last) should sufficiently explain your next step.
Disregarding the hull shape aft still, from a functional standpoint, you can't get to the bow. Location: Italy (Garda Lake) and Croatia (Istria) Apart my previous critics about your hull shape, which are still valid because you did not change the critical issues, I do recognize that you have put a lots of efforts into this 3D model, and I praise you for that. I would like to point one thing which might look ok on the computer screen but is not acceptable on a real boat - the double change of curvature (from concave to convex) of the front windows. Location: Italy (Garda Lake) and Croatia (Istria) What do you expect us to say, that hasn't already been said? When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Of course I am writing this from memory and will accept corrections and alternative methods. Enlisting labor and thought in leu of money produces results that defyA the lazy mansA replication. No other publication matches our coverage of hunting, fishing, guns, gear, tackle, conservation, outdoor news, and wildlife subjects. The difference in hull design of a multi hull boat has advantages and disadvantages over a single hull boats. They have been used for hundreds of years and consist of one main hull (vaka) and a smaller hull known as an ama. The cross sectional area that is pushed into the wave affects size of the wave and resistance. There is also a nice graph showing how wave resistance is insignificant below hull speed for canoe shaped hulls of varying lengths. While a tool that automates crew placement is nice, it is easy to do in a spreadsheet with a few lookup formulas.
Since a dragon boat is supported by water throughout almost its entire length, any "seesaw" effect will be significantly mitigated. The reason for this is that this movement is difficult to predict and also difficult to determine what impact the dynamic movement has on velocity. As for whether there is a fulcrum near the middle of the boat, observe when a dragon boat turns - the back end swings out as the front end turns in - it pivots around the middle of the boat. The answer is "No" because as 3:55 PM intimated, its difficult to predict the effect of boat balance at speed and considering all the other variables such as body movements, etc. Probably has to do with the very high body position at the catch combined with your crew hinging hard and down. Your hull is roughly equivalent to a displacement hull with built-in planing tabs, conceptually similar to the ones seen in this thread: Semi-Displacement? The narrow side decks and no access to them would make it difficult to get around in some situations. Due to the refraction of light through transparent materials, it will create a weird and deformed view from the inside which, apart the aesthetics, will make the helmsman's job pretty difficult and eye-tiring. I see all the previously mentioned flaws still there, so it is obvious that our words are not getting any of your attention.


A Not many folks have had a chance to do this kind of work so I thought it best to share, before I forget. Next week is a fishing week (we'll talk about how to choose skirted offshore trolling lures) but the week after that we get back to boating tips in a discussion of stepped-bottom boats: how steps work, and what advantages and disadvantages you may see from adding steps into a boat's bottom.Hungry for some more advanced boat design info? You remember hearing that a step creates lots of bubbles running aft, that break adhesion to the water? Our editorial cadre includes the best outdoor writers in the Lone Star State—all experts in their respective fields. Multi hull boats are often significantly faster and harder to capsize than a single hull boat but they are often harder to moor (because of their size) and are much more sensitive to weight changes. Adding a sail to shallow and narrow hull boats like a canoe will quickly make them capsize so the small hull was added to one side to stabilise and the vessel is soiled with one hull windward and one hull leeward. When the hull is at a slight upward angle, you are trying to push a larger cross sectional area through the water. If you imagine the boat being nose up at a big angle, a very large CSA needs to be pushed forward - hence lots of weight resistance.
Using a spreadsheet gives you a better feel for the impact on balance of different crew configurations.
Our tool is based on Champion Boats but the data is stored in a table which we modify for different boats.
There is no exterior helm station option, and there isn't much outside deck space to enjoy - you are always looking through glass while boating. I would suggest to make a simply curved window panels, possibly flat or slightly convex, but definitely not concave. Apart from that, I would add side walkways, a better transom and on a boat that big an upper exterior bridge. This is the sportsman's one-stop resource for information and education on Texas' outdoors. The hull design is different in that they are much smaller and narrower than single hull boats. These sorts of multi hull boats have the same advantages as a catamaran in terms of speed and stability but even more so. It might even plane if sufficiently lightly built, but it will do it in an inefficient way - consuming a lots of fuel and pointing the bow upwards. Check out these articles, which delve deep into the ins and outs of different designsA and how they worka€”or why they don't.Top 5 Powerboat Design Trends10 Powerboat Design Flaws to AvoidPowercat Vs.
These sorts of multi hull boats were at one point the fastest sail boats in the world and would have held that record for hundreds of years. Catamaran hulls do not need to be ballasted or have a keel which means they are more streamlined and can thus move through the water faster. Trimarans have large amounts of stability for relatively little surface contact area, meaning they can use a larger sail. So being slightly nose heavy would keep the boat level and should make more efficient use of available power.
Multi hull boats such as catamarans also have an advantage in that it is possible to duplicate equipment such as engines, water tanks, toilets etc. This makes them excellent as long distance, racing boats and many of the round the world record holders of recent times have been trimarans.



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