Guest Posted August 30, 2011 Share Posted August 30, 2011 thats why the keel bulb is hanging infront of the foil. what about a wave piercing skiff? Link to post Share on other sites
RushMan 31 Posted August 30, 2011 Share Posted August 30, 2011 Noticed a photo on a magazine at the local newsagent of a monohull with a bulb "keel" sticking out the side of the hull. Link to post Share on other sites
NZL3551 0 Posted August 30, 2011 Share Posted August 30, 2011 Noticed a photo on a magazine at the local newsagent of a monohull with a bulb "keel" sticking out the side of the hull. That would be the boat Q- Sandy Oatly. Quite an impressive looking boat, clearcoat carbon. Saw it in Hamo. Few teething problems, but getting better. Pretty impressive not having a 'wetbox' as such. A rotating garage door type system. Link to post Share on other sites
Tim C 23 Posted August 30, 2011 Share Posted August 30, 2011 JH it's great you are thinking about concepts outside the square. But a couple of points. If you want to make something go fast you do not add weight. There are only three things you make heavy on purpose, submarines, forklifts, and keel boats. Nearly everything else is made lighter to perform better. So to go fast, one must shed the lead. Secondly, why is someone young and intelligent using units of measure abandoned by this country before you were conceived? This country has been metric for forty years... Keep up the good conceptual thoughts though! Link to post Share on other sites
Guest Posted August 30, 2011 Share Posted August 30, 2011 thats why the keel bulb is hanging infront of the foil. what about a wave piercing skiff? Been done. Very fast. Google "International Canoe" Though technically it is not a skiff. Skiffs go over waves rather than piercing through them. Link to post Share on other sites
Guest Posted August 30, 2011 Share Posted August 30, 2011 The design I'm interested in seeing developed further is a 50 foot Kite boat. Something a designer from down south has been working at periodically for quite some time. I spent some time staying at Peters Bach at lake clear water mid/early 90's and he's created some interesting craft to try and overcome some of the limits. The physics involved are huge.....and very interesting. A kite can be attached very low down in a keel type boat- which means almost no ballast is required....only enough to keep the hull stable. So if you can come up with a big thin craft- it could be incredibly capable. http://www.peterlynnhimself.com/Kites_For_Yachts.php http://www.peterlynnkites.com/news/0610news.htm http://www.peterlynnhimself.com/Winch_Systems.php http://www.lynnkitesailing.co.nz/ http://www.peterlynnhimself.com/Photo_Yacht.php Some reading for you JH- If your looking for ideas outside of the square on how new speed in boats could be developed... Kiteboat on foils..... Low weight- low drag - huge efficiency.....just probably not so good in the light stuff seems to be the main problem......no wind no fly...although 5knots is enough....but anything less than that gets too hard in my experience. Wheels- you may find some of this interesting reading too- your earlier posts are smack on: "Boats for Kitesailing. My view is that boats should be specifically designed for kitesailing, that adapting conventional sailboats (mono or multihull) is about as satisfactory as converting a power boat for sailing would be. Sure, it can be done but can never be satisfactory, let alone optimal. The fundamental problem with using monohull sailing boats with kite power is that they are primarily designed to resist heeling moment. They have weighted keels-which can be much more than half the boat's weigh, and every aspect of their hull design is optimised towards maximum righting moment with minimum drag while heeled. Kite powered boats don't heel (if their kite attachment geometry is correct) so they don't need keels. Nor do they have any tendency to nose dive if the kite pull is appropriately located, but conventional yacht hull shapes are determined substantially by the need to resist sail forces operating some metres above their decks. Monohull kite boats can be narrower and longer than any sail boat ever built-and they'll be faster because of this. Multihulls (cats and Tri's) resist heeling loads by form stability. There are two performance costs with this. Firstly there is substantial wave interference between their hulls. Secondly, the structure connecting their hulls is a substantial part of their weight (and cost). Sailing Multihulls are also subject to catastrophic pitchpoling, and their hull forms are consequently distorted by the requirement to have maximum flotation forward. This has considerable aerodynamic and hydrodynamic costs that are neither necessary nor useful for a kite powered craft. Kite boats should be long, narrow, and have only one hull. They need not and should not have any unnecessary aero drag. This advantageous form can more than compensate for the current disadvantages of kite power when compared with conventional sails (relatively lower L/D and inability to sail in very light winds). The use of this optimal hull form is made possible by the absence of heeling moment when using kite power. The other inherent advantage of kite power, that kite pull is not limited by the boat's apparent wind speed, but can be five or more times higher, will then assure the kite boat's superiority over conventional sailing craft in competitive events. " Link to post Share on other sites
idlerboat 116 Posted August 30, 2011 Share Posted August 30, 2011 Oooooh no they don't. It all depends on sooooomany factors and one major is just what direction you want to go relative to the wind. So the answer could be yes in some situations and no in others. Oh I should know better. You are quite right of course. To generalise, is asking for trouble. Fond regards to you and D. Hope the shift is going well. m Link to post Share on other sites
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