## Hull design for solar boat,design a boat hull number,used pontoon boats for sale north dakota 2014 - Try Out

### Published 31.03.2016 | Author : admin | Category : Diy Sailboat Plans

Location: AUSTRALIA I will try to give an intuitive answer so that I might stand to be corrected later.
Froude's Law also states that a displacement hulled boat will go no faster than the wave length created by the hull as it moves through the water. The prediction of hull speed before planing is most simply the square root of hull waterline length in feet x 1.34. Remember the 20 footer needs to achieve about 3.5 times it's theoretical hull speed now to catch the planing 60 footer. Then instability issues become a major factor for the 20 footer trying to go at 3.5 times it's sub-planing hull speed. So all you have to do (in competition with every young and old designer in France) is to find a way of increasing the power (more sail, more righting moment, less weight) and reducing the drag (less WS, thinner foils, less displacement, etc) while staying within the class rules.
Ironically, the optimum solution of these trade offs seems to come at differing size points, the windsurfer being a classic example.
Once you break away from class rules, you are able to explore other solutions, and splitting the hull into two and dumping the lead ballast does great things for increasing your righting moment (sail carrying ability) and losing weight.
I should have narrowed my question more concisely to planning ocean going mono hulls in planning mode.
From what I have read there seems to be a point where even when planning there is a rapid(non linear?)increase in resistance; and I guess the bigger boat 'sees' the water as thinner than the littler one? Note that all high performance dinghys capable of reaching sppeds equal to or higher than larger keelboats all use devices which either (or both) increase available righting moment (wings, trapezes etc) or reduce drag (foils, planing hulls).
Location: Scotland Does the width of the boat have any significance in its top speed before it needs to plane to reach a higher speed. Is there any way of working out how much extra force is required to go from top hullspeed to planning.
When a boat planes does its stern dip into the water creating a trough which increases the effective hull length which in turn increases max attainable speed.
Lots of questions need answering fast as we are making our hull as we speak for our school rc boat race. On a side line do flares at the bow of the boat help dissipate bow waves from swamping the deck as i had noticed on some of the v70s that they appear to have quite a large flare. At the moment our hull design is very narrow as i thought that narrower would be faster i think off the top of my head that the ratio is about 5.
Location: Australia At the weights and lengths I think you are talkling about the boat won't plane. Location: Scotland Why are the competition all building boats which are clinically obese. In RC boats where keel depth is unlimited or nearly so narrow has almost always been faster. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals.
THIS PRODUCT IS NOT ON A CD YOU WILL RECEIVE  A LINK TO DOWNLOADPRO MARINE SHIP HULL DESIGN SOFTWARELATEST SOFTWARE VERSION + UPDATES Whats this auction all about ? Location: Albania Galley Hull Desgin I dont know much about boats trying to learn. Location: UK That drawing has to be at the least very highly speculative, not to mention controversial. Location: Albania I have seen the reconstruction that the greeks did its way off. Originally Posted by barbarian Based on the three views of the galley how do I draw the splines of the hull? The reason for this, is because much of the water flow, because of the friction of the hull, is breaking up into eddies, especially if the side of the boat, along it's length, is pretty much a straight line.

The ship must have enough under water volume to support itself, it's machinery, and it's cargo, so the curve along it's side must be compromised to get adequate under water volume (Displacement). Originally Posted by DCockey This looks like a resonable description of how boat plans are organized.
Location: Holland Longtail Think the river boats bhnautika mentioned are know as longtail boats. The flat bottom makes it plane easy and becouse it is not to wide it will be quite efficient when it does not plane. When rechargeable batteries are not permitted it is very unlikely the solar panels alone will provide the power needed to plane. Please forgive missing prop, this is just a very basic scetch, hope proportions or sort of right. Location: Holland Planing solar models Great to see you have this experience already, sorry if my remarks about hulls not planing offended you. One of the problems is that you need to get to planing speed so the hull also must be efficient in non planing mode. Perhaps you can post a new thread asking for advice on a book on powerboat design that explains the basics. As the race track is in a straight line it is a very good idea to tilt the solar panels towards the sun. Location: Perth, Australia Solar Boat Design My son is also wanting to build a model solar boat but is uncertain on hull design, motor size and propellor.
Location: australia Dill the main decision that needs to be made is, do you want to go fast or slow and the available power you have. Location: Bundaberg Australia dill, is your son involved in the same competition as my son and students are? Location: Bundaberg Australia dill, if you're in australia there is the opportunity for your son to enter solar challenge if you wish. Built in epoxy glass foam composites the light displacement and generous sail plan of this sailing catamaran offers exceptional cruising performance in speed and comfort. Froude's Law indicates that at sub-planing speeds hull velocity is directly proportional to the square root of waterline length. Unfortunately I think their concept would prove even more uncomfortable than a mini for sailing the Atlantic.
Have to brush up on relativity and similtude-an identical hull form doubled in size has 16 times more stability! THe little boat struggles in that when the wind is string enough to go really fast the waves are too big. We need styles that are quick and easy to maintain without having to wake up at the break of dawn every morning to get it right. Which operating system will this run on ?Forget the expensive and difficult to use boat design software packages when youcan use a much cheaper and easier alternative. I have a Bachelors in Industrial Design Technology, skilled in hand sketching, mechanical drafting and illustrations. To have less of these eddies, designers have learned to have a constant curve along the length of the boat, rather than just a pointed bow and stern.
This is because the width (Beam) of a ship is limited by practical concerns, such as getting into and getting out of channels, docking, and getting through locks.
Now how do I blend the buttock lines with the little nudge on the front of the ship A buttock is at constant beam. The propellor in the pictures is tilted very much this also is not very efficient, i'd place the engine as low as possible to make it more efficient, also good for balance. Perhaps you can make them adjustable to compensate for the sun angle at the time the race is run.

A lightweight catamaran will move along with much effort where as planning hulls need more power. I find it helps if you sometimes imagine things at extremes: So strip the mast, keel, rigging and excess interior weight away and fit a jet engine to it. The top speed of a 49er in faster is the water is smoother than if it is rougher for the same wind strength.
Do you reckon it would be even possible for a 2kg boat which has a waterline length of 70cm to even plane.
In the IOM class(semi-development) where keel depth is restricted and ballast limited I believe a relatively wide boat did well for a while.
Any comments on this would be usefull we are also planning to add some flares to the front which we think will help it ride over the waves as that is often a major concern with rc models. Anyone developing a hull model based on that illustration will need to use their own ideas for the rest of the shape of the hull. Technical expertise , Proficient Photoshop, Illustrator, AutoCad, Rhino 3d, Alias, Solidworks and some understanding of 3d max and vray. This curve pushes the water aside, as the water passes, creating pressure which limits eddies, kind of like a bank in a turn on the road.
They also solved the shaft trough hull problem (please see picture, the bow ends in a very high point, would like an explanation for this but think students can omid it).
As mentioned before wheight is a very important factor here, the less weight to lift out of the water, the easier it planes. Since we're not talking about being stuck in a wave through- what say keeps a minitransat 6.5 proto from going as fast as a volvo70? Then to achieve double the theoretical hull speed in each case may entail a relatively small further increase in power, say 20% for arguments sake. Now I have done some studying of classical architecture and and have some know how about engineering but unfortunately I know nothing about boats or boat design or fluid mechanics. Once the water flow has passed the widest part of the boat, it experiences what would be like a reverse bank in a turn, which tends to help push the motorcycle off the road. For the 20 footer to catch up to the longer boat is going to require a very large increase in power as drag forces, particularly wavemaking turbulence of the hull and appendages, and drag forces produced by the rig then increase rapidly, and are difficult to overcome.
The advantages and flexibility offered by using subdivision surfaces is massive and can only truly be appreciated once you start to use itTell me more about the software ?
As far splines and NURB modeling im proficient can create Automotive Surfaces Class A and do have an extensive understanding of how NURBS and splines work and are crated in CAD programs. A few years ago I went to boat museum and guy there gave me a hand out which explained how the hull of the boat was drafted, the method they use on the three views to create the hull curves but I dont remember any of that.
For planing hulls, friction is the predominant resistance factor, which scales proportional to the square of the waterline length. I got a few ebooks on boat building bu they dont explain nothing they are more of a construction related. So, you want gradual turns for the water to go around, as it goes past the hull, especially at the bow. For similar boats, the available righting moment is proportional to the displacement, which scales according to the cube of the waterline length.

### Comments to «Hull design for solar boat»

1. AnXeS writes:
Plans which support massive vitality consumption.
2. LEDY_BEKO writes:
Superstructure (every little thing that is not the hull.