Location: Nowhere I have seen many hulls that have a V forward and are flat back at the transom. Location: Southern California A 'V' bow entry on a flatbottom hull eliminates one of the greatest advantage to having a flatbottom. If the bottom is tapered to a 'V', exaggerated transom lift will cause bow-steering in following seas and other undesireable handling characteristics.
When angling over a swell, nothing grips the face better than a hard chine going all the way to the bow.
Location: Eustis, FL Yes, this is a common configuration (V entry with flat aft sections) and has been referred to by several names over the years, like double wedge, modified V, etc.
Location: florida Aquasport from 69-70 thru 79 in the 222 model had a flat bottom with a V entry and is now one of the most popular boats used by guides in the SW Florida region. Location: Eustis, FL Bulut, what you have modeled is a weird variation of a box keel boat. The trick, you should be trying to employ is to get a fine entry and a sweet chine sweep, so the forward sections of the chine flats can help with lift.
I'm not sure I understand you goals with this model, but you may want to consider more conventional approaches to these. Instead of using a V entry, i did the opposite--i made the widest point of the hull right smack dab where it is going to meet the chop AND i put the most sunstantial weight (54 gallons of fuel) from that point fwd. So there are 3 forces that come into play with the bow, The weight of the fuel, the extra width at the impact point, and the lifting of the transom which presses the bow down. Bulut, there is very little new under the sun when it comes to small boat hull configuration. Originally Posted by Bulut is it posible to combine a "V" hull design with flat bottomed hull design?
Do a search for Surf Dory's, a larger power version, with shallow draft, slight vee-bottom, double ender of the Calkins design.
The Sportfisher Bartender's, will get to the fishing grounds first in choppy seas and swells when other hull designs have to slow down.
Location: Oriental, NC I'm not an advocate of flat hulls but Loveofsea has found a system that works for him. PAR, we need to be careful about dismissing the flat bottom in rough seas without looking at his whole proposition.
I use the more normal V forward with much flatter sections aft but also use an aft bottom design that lifts the stern and holds the bow down. I'm not sure what Bulut intends for his hull but it at least partly follows the box, or canoe shape, keel with a flat upper hull that has been discuss much on forums lately.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Thanks for the reference and it's pretty interesting though i don't understand most of it having failed physics at school. 1: You need a large horizontal surface to put solar panels on, the space between the beams. 2: In a solar boat you never know how much power you have, a planing monohull has high drag with lower speeds, a displacement monohull will never plane. As for hull form, make it long and slender, round bottomed, look at nacra cat (for example plenty of others around) for inspiration on hull form. For propellor shape, it depends on the engine you plan to use, the weight and hydrodynamic qualities of your boat. I have seen some planing hull forms in these pages but did not see them plane very convincingly, the question is: Will your hull plane? Location: Holland Race rules, use of batteries Some boats in the solarspash sprint race go very fast for a short period of time.
They use power stored in batteries filled from solar panels over a long period of time before the race. Location: australia Woodyp Planing hulls require a lot of energy to get up and planing, ask your self do I have that energy with the equipment I have? I'm an investment analyst, and through my continuous dealings with individuals with great ideas and no capital, I've learned a valuable lesson. We are simply looking for builders, knowledgeable and willing to learn, break out of the box, etc. Recently we've seen some fascinating things from Bentley Yachts, but not sure of the viability of these hull designs, as most look like plans only. I hope this helps to realize, this is not SPAM, but simply a request to build a team of people to analyze an idea, and to determine if it is profitable as a business model. Location: Texas cothrang, I was unable to private message you through the forum. Please continue to send e-mails and post, and we will review and attempt to contact the best team members for our project.
This means that the boat has no necessity to have an increase on lift in the after part otherwise you reduce the dynamical trim angle and the boat will have more wetted surface at high speed.
I've seen a beautiful passenger boat pic, it would be possible to have an rough idea concerning the price? Thsi passenger version it is just a proposal to use the same hull (and same mould) with its high carring capability to be used for example as a passenger vessel ferry between islands in Asia countries (like Thailand) with low vessel cost and low operative cost compared with local built vessels. Location: Montgomery, Alabama OK, we're moving forward, and apologize for the delays. If you are interested, and have not already contacted me directly, please send me a request so we can begin discussing our process.


SeaPhantom took a boat builder's approach, and solved the aerodynamisist's problems hydrodynamically.
Location: Port Orchard, Washington, USA The hull shape has some merit in some seaways and are very different because of the speeds involved compared to the old catherdal hulls.
Other contractors on the project include England-based SP ? which will conduct the structural engineering and supply composite materials for the hull ? and Virginia-based AMSEC LLC. Charles Robinson and William Burns are the principals of M Ship Co., which has seven employees. I thought the 'charter' project the defense dept did with the evaluation of the INCAT cat product was a realistic experiment, and the joint project with the Brits on the tri-hull warship also. While the OLD military is still fixed on nuke submarines , carriers and the like , the actual folks doing planning realize these expensive toys would be useless , in say the Philipeans , or Indonesian areas , where Muslem ideoligy is attempting to take over and rule the world. Sure there is PORK in DC , just look at the latest spending bill 14 inches thick and 30,000 pages of gobldygook, no one has even read , before voting for it. FAST FRED Well maybe with this reasoning we ought to revive the old 3 point hydroplane ideas as well. And this M-Hulled vessel isn't going to be able to carry any needed equip to a battle area.
Here's a couple of reasonable ideas for the new generation littoral ships, and maybe scalable down to smaller combatants.
Originally Posted by brian eiland getting out of hand, this pork situation, and particularly as related to our defense spending.
Location: VAN, CAN I'd like to say that I know Bill Burns and he has been working very hard over the last few years to get this project off the ground. Sure but none will carry a couple of hundred troups and their gear 500 or 1000 miles at speed.
Best example of money well spent is the Mach 10 toy originated by DARPA , run by NASA that will pave the way into civilan space. With the present shuttle & roman candle drive only a politico with a monky wrench can be put in space , as pay off for damage done (John Glenn). The concept proved with Hypersoar the MACH 10 test vehicle will allow us peons to go to space or not, (pick a different flight) on many long distance trips.
As former military naval engineer, I have many doubts on the capability of this boat for carrying armament and about its behaviour in waves. Do not hope to get air lubrication as the air is not running along the bottom of the hull (the russians know pretty well the very efficient technic of injecting air at the bottom of the hull, the have have 55 knots patrol boats using that feature). And worst for the US Navy, the very good engineers of commercials heavy hydrofoils are russian and that would be inacceptable.
Yes, it's sugaring for improving the retirement of a former Secretary, an old funding system in the US. The trimaran RV Triton is finishing its very successful trials which gave a lot of data for future boats. Finally sometimes there is no need of complications; the fastest ferry in the world (60 knots) is a simple catamaran and makes the journey twice the day between Buenos Aires and Montevideo.
The boats shown by Yipster are projects by the Russian Naval Technical Company, and one of these projects is named Sokol also.
There is not enough volume with the cooled exhaust gases of the engines to get an air lubrication of the hull, also I do not think that a diesel engine would apreciate a such back pressure.
All you know that an increase of 20% of speed will need far more than an increase of 20% of the power; on some hulls it would be easily more than 50%. The mathematical models, the design and the involved technics are very complex and that explains that the precedent trials (first idea of air lubrication was about 1885 if I remember well) failed.
Wigs or Ekranoplans are very interesting but suffer of major drawbacks: it requires a lot of power for taking off and there are stability problems. Location: netherlands i stand corrected, allready wondered how those hulls would be ventilated. My question is, is it possible to have a boat that is all steel and build a wooden structure on the back similar to the attachment. This will dictate how the entire design goes together and ultimately, whether it will work.
Location: Italy (Garda Lake) and Croatia (Istria) It can be done, as it has been done in the past times.
Ad Hoc's points are to be considered, because you will have to comply to your local regulations.
With an airboat you would need to swing a larger prop than you propose to get the best from the engine.
As Rick stated, you want more weight aft; however, you do not want too much weight, as that may make it harder for the boat to jump the bow wave and get on plane. It has been my experience with airboats that it is easier to get on plane when in very shallow water. Since we're talking about a high performance hull, this hull form will be on plane 95% of the time and is quite efficient at such, until the chop picks up enough, to get stuffed under the V sections and pound on the flattening midship sections. CANADA Flat bottom questions Is a Flat Iron skiff better in rough conditions because it is more prone to keeping its bow in contact with the water, or is a flat bottom with some rocker forward (pacific city dory) the better performer?
Typically the box portion (the V part hanging down) ends in a point, rather then being cut flush with the transom as you have. This will substantially increase the amount of displacement and drag your drive assembly will have to overcome.
The extreme amount of deadrise in the box will not offer much lift, so you'll be relying on the flats.


If you must try a planning hull, a flattish bottom will be the way to go (like tinnie) with the centre of gravity about 75% aft on the waterline. When you are in a craft that will disintigrate if it touches one, flying mere meters off the water? It seems to me as though all they really have to do is look back at a couple of older 'run-about' designs referred to as tri-hulls or cathedral hulls (Boston Whaler as one example). Haven't followed the results of these two experiments, but I'd guess they have both been rejected for reasons of 'not invented here', so we must embark on some more pork projects that sometimes stand reasoning on its head. I think its great to see a small company get a break, and I wish them all the success in the world.
I wish my best to Mr Burns but I think it's very unlikely to have a technical breakout as claimed in the internet site which is more advertising than technical explanations. It works on fast racers running on flat water, light enough and with a lot of surface but at price of a terrible instability. About as large as a hercules transport, they get right up off the water surface and are large enough to operate in relatively rough seas.
The Russians claim very interesting results: 5 to 10 % of the engines power is taken by the compressor(s) but the gain of speed is about 20%. For the while the russians have a patrol boat able to get 55 knots with the power required to go at 45 knots and the speed gains are consistent over the major part of the speed range.
This hull form is usually limited to protected waters craft, though the old, down east lobster boat hull styles, could be considered a double wedge hull and were often taken well past the protection of sheltered water. Also, is the pointy bow style of flat bottom skiff more succeptable to chine trip than its jon boat cousins? There are a few plane mode box keel designs, but most are limited in top speed before they begin to have bad manners.
This can be accommodated by using a fine, sharp entry wedge and moving considerable displacement aft, but it will still pound, just not as quick.
This provides a fine entry, self leveling properties (typical of V's) can knock down chop and flat plane areas aft.
The wide chine flats will probably still receive some pounding in a healthy chop, but the box will help knock some of it down.
Shaping the chines to do this isn't a walk in the park for the most skilled among us, let alone the novice.
The flat areas aft, provide the plane surface, the forward V sections lift, fine entry and stabilization. I know that in worst case scenareo, that hull charastic (water rushing to the transom while at rest ) is a major cause for small boat capsizing. It is made of SST and has a cutout for the engine, it projects out 11" from the transom and the corners are hooked down for lift. Make sure to make hulls slender and not longer the neccecary for buoyancy to reduce wetted surface area. This is a long skinny mono main hull, semi circular in section, maybe pointy at both ends, with a small outrigger.
As for the whingin', with all the ridiculous projects that the government funds every year maybe its ok to have a rip at something in our industry. You can recognise in the drawings a catamaran, a trimaran and two slim hulls (with very interesting bows). They were often used in displacement mode in green water and only kept at pace with the sea, which is always a wise course if you have to make a living doing such daily. These shapes are generally used in protected waters, as they haven't enough deadrise aft to maintain comfort, at plane speeds in rough conditions.
The aft sections could be made flatter, like a skiff, but she'd then be less efficent at displacement speeds. The lifting strake gives additional lift to the transom and is 'tuned' to augments the lifting capacity of the trim of the lower unit. That is ; they have been trying to make an aircraft stay on the ground, instead of make a boat fly.
As for Chuck Robinson, like you guys have'nt pulled a few strings, he just has better ones than us.
It's has been tried dozens of times,with and without curtains, with and without blowers and even with hinged doors between the hulls. It's valuable specially under Bush the second, intimately bonded to the oil and armament industry. The russians have built thousands of power foilers since the sixties and know very this technique, which has its advantages (simplicity) and limitations (the major being cavitation; if you want to stay simple speed is limited to about 45 knots). It takes more power to get it up on plane than a simple flat bottom but is more comfortable in waves due to the Vee forward and the forefoot. I use a 2,000gph pump in the belly to protect the nights at anchor, and i use a self-priming water puppy mounted on the transom to pull the water out when i am taking shots of water while under way--works great! Make savings in gold, diamonds and silver, and prepare food and gas reserves, hard times are maybe coming.




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Comments to “Boat hull design terminology quiz”

  1. SuNNy_BoY  writes:
    And two small outrigger sponsons.
  2. mfka  writes:
    Comprise the same quality as British white-oak before we mounted it drained off may.