National 12 sailboat plans free,jet ski rentals in ocean city maryland 5k,used boats lake norman,boat rental hot springs ar lake hamilton jobs - How to DIY

Published 09.12.2014 | Author : admin | Category : Simple Boat Plans

This innovative National 12, designed by Colin Cumming, is a modern design which promises to be fast. Setting of downwind and placing her on the plane she didn't drop her nose, or particularly raise it, sort of elevated herself throughout her waterline length amazing. She is very forgiving and does all the right things (including not capsizing when the helm takes an excursion overboard).
The unusual chine configuration imparts buoyancy and power aft and then loses itself into the sheerline thereby contributing to the fine entry forward. Sweet Chariot is a performance 12 that can be built from the kit of precision cut plywood parts using hand tools in about 120-140 hours. The National 12 is a development class so hulls and rigs can be changed or modified within the class rules. A beautifully figured Sapele deck enhances the beauty of the boat but also adds a few kilos weight. High quality marine paint with excellent opacity and adhesion for finishing your boat, canoe or kayak. Wire rope for rigging a sailing boat, made to the length you need, with loops or thimbles on the ends. An online resource for anything that sails from sailing dinghies, trailer sailers, yachts and even rc sailing boats. One of the most interesting developments about to be unveiled is the new foiler or foilers from Andrew McDougall(AMAC)-designer of the Bladerider and Mach II Moths. 1) Mirabaud the largest 2 foil monofoiler currently sailing-about as fast as a Moth according to Thomas Jundt-the developer. My conception of a Peoples Foiler follows but it is critical to note that the people will define what actually becomes a "Peoples Foiler" not me but I suspect that the NUMBER ONE ingredient will be the sheer unadulterated fun of flying! See pictures below of Jo Richards National 12 using a t-foil rudder AND a trim tab on the daggerboard. Location: Cocoa Beach, Florida Peoples Foiler:2010-flying for the fun of it! It should also be pointed out that a Peoples Foiler need not be built out of carbon-glass and aluminum would work fine including an aluminum mast and ,possibly aluminum foils.
Location: Australia Doug - given that you know so much about the people's foiler why don't you design it? Originally Posted by Munter Doug - given that you know so much about the people's foiler why don't you design it?
Originally Posted by Chris Ostlind The return of the Mothership to District 9 so that alien technology can be pilfered. Originally Posted by Paul B You have seen the attempts at drawings he has posted on this site, haven't you? Location: England I have to agree with Doug that a simple foiler that foils for foilings sake (rather than max speed), should have appeal.
In terms of a full foiler, I think an unstayed rig would be a challenge because you need such a flat sail when foiling (but not when hugging). Whilst there is much that can be learned from Moth's, the modus operandi of a peoples foiler is so far removed that I suspect that it would be quite different to a detuned Moth.
The problem with the Hobie Trifoiler etc is that they were large and cumbersome, and slow to rig. BTW, I am currently conducting several hundred thousand dollars of testing on an automated hydrofoil system. Originally Posted by PI Design 1) I wonder if an arrangement similar to what the early foiling Moths used (before they were banned) might be good for a PF - twin surface piercing foils at the daggerboards longitudinal location? 2)BTW, I am currently conducting several hundred thousand dollars of testing on an automated hydrofoil system. 1) Maybe but I doubt it-Brett Burvills Moth was fairly hard to control downwind(as I remember it) but the dual foils would be expensive. This, downgrading of potential, thing is always a tough sale unless the price point is so drastically low that it leaves the comparison paradigm far behind. I don't see it happening in a market that has to compete with full-blown kite rigs that will still cost half as much out the door. Sorry, can't give more details of my work, but the effect is very noticable - there is a real reluctance for the foils to actually break the surface (although my section, size and aspect ratio are quite different to a Moths foils). Location: Cocoa Beach, Florida PI, just wanted to eliminate the shrouds-one more thing to fly into. Mardi Gras Race Week Invitations » Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Search this Thread Advanced Search Similar Threads Thread Thread Starter Forum Replies Last Post Tomahawk: Peoples Foiler? As far as size rule, I want to have a simple box rule to keep all the entrants manageable, but the cost may be the only limit we need, except perhaps that it has to be roadable on a trailer. I think that requirement is already in the Racing Rules of Sailing-no point in duplicating? Originally Posted by hoytedow You would have to disqualify water ballast or require it to be specially dyed to avoid dumping and reloading at end. Location: La Florida It would be easy enough with a bunged bait well and a bilge pump. Originally Posted by Petros Since it appears comments slowed down I thought I would post below my current proposed rules, along with my comments that I submitted to the committee. Here is my reasons for the changes (from everyone's input): The cost limit being too low seems to be a legitimate concern. All the other suggestions for limiting cost will limit design choices, creativity, and not always limit total cost, and some are not practical to enforce (it would encourage cheating). Limiting the build to group events I think will reduce participation, raise costs, and might also limit creativity for certain time consuming operations.
I take it boomkins and bowsprits are out of the question, if they extend past the 14 ft Length limit. These numbers are based on a total displacement of 700 lbs, 200 for the boat and 500 for the 'cargo' and crew. By not allowing a spinnaker of any kind and not allowing spars to extend past the 14 ft Length, presents the designers with some interesting conundrums.
The biggest problem would be to keep the boat from stuffing its bow on a high speed downwind run. I can foresee a 4 ft wide mono with 18 inch hiking benches, or a catamaran with asymmetrical hulls.
I don't think hiking straps should be allowed because they give tall, trim, physically fit people an unfair advantage.
The full extent of the hiking bench is counted, where the full extent a tall trim person can hike out is not.
I was also thinking to make the hull length 14' bow to transom, and 16' overall including bowsprit and rudder and other appendages (allows builder to trade off boom length, sprit length, rudder location, etc) . Your proposal is unique in that it doesn't allow a spinnaker and it has a 'cargo' requirement.
I've always hated spinnakers and thought they were just a dodge to make a primarily upwind rig shine, better than it deserves, downwind. Location: Arlington, WA-USA I have sailed both with and without spinnakers, and other than making nice photos, I do not find them very practical other than to keep the crew occupied during down wind runs.
That is why only racers use them, and consider that they were NEVER used on anything other than racing sailboats, and than only recently.
Location: Cocoa Beach, Florida I love spinnakers-particularly asymetric sails. I think you'll find that the mass manufacturers of modern dinghies, even the ones aimed at leisure and resort use, normally make spinnakers an option because many people love them, especially when they make the difference between sliding along and getting up on the plane. Similarly, in Australia there's two development classes that share the same hull and working rig rules, namely the NS14 and MG14. But any rule that measures all sail area will completely discourage spinnakers anyway, since they are an extremely inefficient way to spend area. 3) a performance single hander that uses a retractable, single curved lifting foil( C-Foil) to increase speed and improve handling. Well, that was one hell of an inspiration to me-the first time in history that lifting foils had been used on a keelboat to win a major ocean race. 1) the top center of the trunk can be moved fore and aft to change the angle of incidence of the lifting portion of the foil only-the incidence of the vertical portion is not affected.
2) the sliding seat mentioned above can be tied into the sliding board to allow automatic side to side board movement. 4) Since the board( C-Foil ) is not conceived of to lift the boat clear of the water(on a regular basis-stuff happens), there is no requirement for an altitude control system(wand) as on a Moth. Foil assist on these monohulls lifts a small percentage of the overall sailing weight on these dinghies-for instance on the I-14, it is only 89lb nominally. On Flight One the lift due to foil assist will be closer to a maximum of 60% and it will be 100% adjustable by the skipper.


If it is decided that a rudder T-foil will be beneficial, then Flight One will be able to use a system already devised for another boat of mine that allows a simple way to retract the rudder hydrofoil. My gut feeling ,at this point, is that the curved lifting foil would be more efficient in developing vertical lift but the vertical lift from DSS would also add to the boats righting moment. It does appear that the Flight one system( C-Foil ) would be significantly simpler and possibly have a greater range of adjustability and therefore be more suitable on a singlehanded dinghy. The main advantage of a system like this would be the absence of a sliding foil that has to be moved-by the sliding seat or directly by the crew. 1) the lack of ability to reduce the area of the lifting foil to configure the system for different wind conditions. 2) According to Greg Ketterman the curved lifting foil will be significantly more efficient that the main t-foil in this kind of configuration. 3) One of the greatest advantages of a bi-foil configuration in a fully flying foiler is its ability to use veal heel. 4) The main t-foil hydrofoil would not be fully retractable for beach sailing-it would always hit first unless some method was designed that allowed the foil to fit flush with the bottom. All in all, when compared to other forms of foil assist I'm convinced that the Flight One system( C-Foil) is simpler in every case and may be faster in most cases with a higher degree of vertical lift. This is as important to the Flight One concept( C-Foil ) as is the curved foil because the idea is to break the mold in performance dinghy design. Sliding seats of one type are used by the International Canoe, the Skate and a maybe a couple of other boats. Traps add only two wires, tiny mast fittings and one harness to the equation - and they allow movement in three dimensions. In actual real world use, current sliding seats demand the same kind of athleticism, speed and reaction time as trapezes. Please don't think of this as negative criticism - it is just to help outline some of the possible challenges in front of promotion of this concept. I also envy the ability to fund, promote, build and maintain all these projects concurrently.
My version of the concept will try to develop the sliding bench seat which I think may be less daunting to newer sailors than a trapeze and probably more comfortable to some people. There is lots of room for different designs incorporating the C-foil and I hope others will take an interest in helping to develop designs suitable to utilize this technology to the fullest.
Might be possible to use some sort of hand crank, line that rotates a drum between the two sides of the continuous trunk or?
5) Despite my first impressions earlier the C-Foil does not appear to be able to increase righting moment significantly, though this may change as the idea is refined.
9) A retractable gantry supporting a small t-foil rudder may or may not be an asset in pitch control for a dinghy using the single curved foil.
I've looked at a lot of possible solutions for this including using some sort of roller that touched the board and allowed it to move with a hand crank or another means of causing rotation.
Hugh Welbourn makes a comment-the first I've ever read- about how the DSS foil on the Quant 28 is moved.
When centered it is retracted and it can be deployed on the port or stb side and adjusted at will. The drawings do not indicate which way the boat is going, but I'll assume the convex side of the curve is to leeward and the crew is on the windward wing. The only problems I see is there is a whole lot of foil area for the amount of lift being provided and it ends up not being well supported in the boat, when fully extended. Another problem is that the bending moments on this presumably high aspect ratio foil are going to be enormous. I can think of one possible design that would remove the need for the curved board but accomplish the same goal, lengthen the righting arm so more sail area can be carried.
What you would have is essentially a trimaran with the floats removed and replaced with foils, with hopefully, a huge savings in whetted surface area. The main hull would have a dead flat run on its bottom similar to a Brown Searunner trimaran. Location: Cocoa Beach, Florida C-Foil Sharpii, thanks for the comments! Boats I've sailed with either a CB or daggerboard were either impossible to adjust under load or very difficult.
Take a look at Doug Halseys 18' tri in the picture below-it seems to be similar to your idea and was designed and sailed without amas-just foils and seems to work well. Location: Cocoa Beach, Florida C-Foil I think a boat using the C-foil could represent very advanced technology in dinghy design since it allows much more vertical lift than currently used as foil assist.
Design latitude is the key because this technology can be used in small single handers as well as two-three person performance designs. I started thinking about a boat similar in concept to the Quant but without a foil retracting mechanism. As the boat heels, the foils on the leeward side produce more lift than those on the windward side and hopefully start lifting the boat.
If it gets going fast enough, the main foil will break out of the surface of the water and start planing.
I think your idea is neat in its simplicity and might work well-you could fool around with foil areas and aspect ratio and do the boat fairly inexpensively. The craft has a tallish stem, the bottom of which is designed to be below the waterline to aid windward performance. Fyne Boat Kits developed an innovative patented construction approach to a design by Colin Cumming utilising FSC okoume marine plywood and solvent free epoxy to create a strong lightweight durable ecologically sound aesthetic craft.
All National 12 boats which are raced have to be measured to ensure that they conform to the regulations. But this is a huge untapped area of monohull design where the gains are potentially increased performance and better handling with minimum sized foils . Interestingly, the 12 t-foil rudder can be partially retracted for light air sailing to get rid of the hydrofoil yet leave enough rudder for control.
This is especially true when foilers have gone to such great lengths to sell the sizzle way more than the steak.
Foiling Lite Junior will be confined to its own slender niche market, just like its big brother and that will not attract a major manufacturer to enter the fray. Maybe somebody would deserve credit if they can make water ballast work at this size and cost range?
16' is the size of boat that does not have to be licensed in WA, and a few other states (some states do not require registration of any boat without a motor, some exempt all racing boats), but there are a number that require an inspection, a data plate and boat license no matter the size.
As we get more participation we can add both a larger, more expensive class, and perhaps a junior class [i.e. Many would build at their leisure in the home shop, a few hours at a time, but could not afford to spend a week in a building workshop.
A boat without a bowsprit is less of a pain in the *** to trailer and has less set up work at the launch ramp.
Spinnakers also favor taller masts, creating what I consider another unfair advantage for taller rigs. Even my mother used to use a spinnaker on the 36' cat she lived aboard, because she found that it made a real difference in her enjoyment when doing coastal passages - and it allowed her to make port in the daylight hours. The Merlin Rocket rig is largely similar to that of the National 12 (which is roughly similar in heritage, age, rule set and ratios) despite the fact that the MR has a spinnaker and the N12 doesn't. The rig on the spinnaker- and trapeze-carrying MG14 is basically identical (apart from minor details) to that of the non-spin and non-trap NS14. The single curved main foil( C-Foil) when retracted allows two replaceable tips to stick below the bottom of the boat so that the hull doesn't touch sand. Starting many years ago in trimaran designs where they were developed to a high level in ORMA 60 footers and today in many multihull designs from the gigantic Banque Populaire to the Nacra 20, A Class and C class catamarans among many others. I thought a lot about it and it seemed like a natural to use these foils on dinghies-here is the original thread-including a bad idea I had that was to have the dual foils pointing outboard.
The board can be accessed by hand or by other means to move if the auto system is not used. I'm interested in trying to inspire others to help refine this design or to use this technology with no strings to do their own design-with or without my help.
In fact the only dinghies that do use foil assist are the I-14 and National 12, some Cherubs and the SK4 skiff as best I know now. Note, that on these monohulls the vertical lift is from a rudder t-foil, which allows the crew to be further aft upwind or downwind adds to crew weight to hold the stern down. It would be able to add RM and the crew would have to handle moving the foil every tack as with the single sliding curved foil on Flight One. The Flight One system( C-Foil) is infinitely configurable to the lowest drag system for any condition.
It will definitely be more adjustable to varying conditions than any other system as best I can tell now.


That means getting away from super athletic torture chambers by using variations on movable ballast systems. I've always loved using a trapeze from when I was very young on a Flying Dutchman to more recently on a Hobie 16. The sliding seat on my version of the concept boat would also allow the seat to be tied into moving the foil side to side making that function pretty nearly automatic. At the same time, the single curved foil does NOT decrease righting moment as does a curved lifting foil on a multihull. A unique, rotating, rudder system where the rudder trunk actually rotates 180 degrees may be possible to allow the t-foil to be retracted 100% reducing unnecessary drag in light conditions. It has a roller in a wetbox where the shaft of the roller is sealed like a stuffing box-only simpler. Using the roller system it could be tied into a sliding seat so that it is automatically deployed tack to tack.
Hoop like wings on airplanes were tried in the '30's and once in the '50's, but they never took off. I'm not really concerned about binding etc because these type foils are used regularly on beach cats and other multihulls under much, much higher loads.
More will be learned with experimentation-the new test model I'm building and the fullsize boat it represents use curved foils like this one( same radius) that are under even heavier load so I'll learn a lot there. In fact, if it is not sailed flat and allowed to heel to leeward it could actually reduce the righting arm! Check out the rough sketches for the Tantra II; it uses dual curved foils(one at a time, generally) that do increase the RM of the boat.
It offers the potential to be superior to any current dinghy that isn't a full flying foiler and the technology offers the design latitude to develop high performance dinghies that can be much easier to sail than current performance dinghies.
The surfaces that are shaded are supposed to be below the waterline and the non-shaded ones are supposed to be above.
There is a fairly generous longitudinal rocker which lifts the bow when the crew weight is aft during fast downwind sailing. The class was started in 1936 by the Royal Yachting Association as an alternative to the more expensive International 14s. The foils don't lift the boat clear of the water but do reduce the wetted surface of the hull and can enhance pitch performance and handling upwind and downwind . AMAC may be the closest to actually producing a PF wanabe-it will take a serious organization with the capability of marketing and delivering worldwide.
Both Brett Burvill and John Ilett think Burvills system might prove fast if it had the same development time as the fully submerged bi-foil system. You might as well suggest to the mythical manufacturer that they have to start out with a 50% reduction in potential marketplace in their business model. Now, you have a sailing community that knows all about the speed potential of the existing boats and you want to sell them Speed Lite Junior. We all know that the existing platform can be adjusted to suit sailing conditions, but that's not the point, now, is it? However, building workshops would be a great optional event, if some people are a bit intimidated by the design and building process, they can do it an a workshop with lots of tools available, and expert instruction (perhaps with design assistance as well). See, for example, this championship boat wearing the insignias of both classes on its mainsail at once!
And in the International Canoe, the spinnaker version has about 4 x the sail area and is about 3-5% (approx) faster! Relatively recently, dual curved lifting foils have been applied to the Open 60's with Virbac-Paprec 3 winning the Barcelona World Race by a large margin using them.
Thanks to Greg Ketterman and others for straightening me out on that one:Dinghy Design: Open 60 influence? I believe that this concept has incredible potential for developing a unique dinghy that could be a major breakthru in dinghy design. The idea, to me, is to be able to sail a fast monohull in the most comfortable way possible to allow participation by people that might not want to hike or use a trapeze yet be able to, at least, match the performance of some trapeze dinghies. The variation I want to develop will be a bench seat with a backrest designed with major comfort in mind. To further aid in this it appears that a system can be used that would adjust the angle of incidence of the vertical lifting portion of the foil(without affecting the lateral resistance portion) by designing the athwartship, partially open, continuous trunk for this facility.
It's a question of engineering and building the foil properly which I think can be done fairly straight forwardly. It offers options such as the use of a rudder t-foil or not, extended tip foils that prevent the hull from touching ground.
What if the bottom of it could become a planing surface, so it skips across the surface like a skipping stone.
One puts his feet on the edge of the wing deck and leans outward using the trapeze for support, while the other steers the boat. I've always been concerned that the proximity of the lee foil to the surface might be a cause of too much drag but that is debunked by both Wellbourn and the owner to some extent. Because the class can change the rules the boats has evolved over time, moving from wood and clinker construction to high performance glass and carbon fibre - foam composite boats. The 12 is a development class so hulls and rigs can be changed or modified within the class rules.
He is the most widely known individual foiler designer to speak to the need for an easy to sail foiler to allow people to get into foiling without the hassle involved in some of the high performance boats-I'm looking forward to his ideas.
Use could be made of variations of the Howes foil for the ultimate in two foil altitude control simplicity.
I think this idea has merit but I still think a properly designed bi-foiler could be less exensive and equally as easy to sail. I thought raising the cost limit gives more flexibility and encourage better quality boat builds.
I am going to suggest that we start out with a mono and multi-hull class if we get more than three entrants in each category. You will end up with something that's more like a real boat an less of a piece of sports equipment that can do only one thing well. Thats where the curved ,retractable lifting foil( C-Foil ) comes in: in conditions where lift is not productive the lifting portion of the foil can be reduced without affecting the area required for lateral resistance!
The seat(one on each side) will be able to move quickly and create righting moment equivalent to a trapeze dinghy. It looks like a system like this could be done fairly simply and robustly-not much more complication than a kick up rudder design. Being supported only at where it comes out of the hull, the load is going to be concentrated there. The foil, as you surmised, operates on the lee side of the boat and, because of its unique design, can be an asymetric section. See the picture of the original (35 years old)Tantra hull showing the molded-in leeboard concept that would house the curved foils on the updated version.
I'm sure more could be learned in two boat testing to see what happens with the foil planing and the other boat retracting their foil. Many people use the Moth as their reference point as to why a bi-foiler can't be easy to sail. I think a seat like this will encourage more people to give this kind of performance dinghy a shot because of the ease of use and comfort of the seat. On the Nacra 20, the curved foils can be adjusted under load,and while they don't have as much curve as these do they are under much higher loads laterally.
You are free to fit your boats out as you please so you can customise your twelve to your requirements. Some people learn to sail in 12s but some prior sailing experience is recommended. Thats unfortunate because the concept has a lot going for it in an easy to sail version--just two foils, retractable foils, doesn't have to fly 3' in the air etc. In addition, the racks supporting the seat will be designed to have buoyancy pods far outboard that will prevent a capsize should the seat be in max position and the wind quit. The foils would be angled inward, so when the boat heels, windward foil comes out of the water and the leeward foil produces more lift. You may find them 'tippy' at first but that soon passes The flared shape gives increasing stability when heeled so the boat is not just going to fall over.
As the foil bends into a tighter circle, it is not going to want to retract back into its case. In order to keep it from binding, you are going to have to luff almost to a complete stop before you can retract it and shift it to the other side. But they are lively, responsive and rewarding to sail which accounts for much of the attraction of (and loyalty to) the class. This, in a very light boat with an enormous spread of sail, is going to be quite embarrassing.



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Comments to ┬źNational 12 sailboat plans free┬╗

  1. Smack_That writes:
    Going to make use of on your wood smoke to make tar and creosote and across this.
  2. ulduzlu_gece writes:
    Screwdriver and take a look at for rot frame where it meets the surface.