I believe you have received some interesting advice on this subject tread you started, and hopefully more will be forthcoming. Originally Posted by simon I think the advantage of strongall is that you have hull-skin that is very resistant to localized impacts. Originally Posted by BlueWaterMarine I have a 65 ft strongall-type monohull under construction. Originally Posted by simon I took my thin plated aluminum monohull to Antartica and thought that it withstood quite well the ice. Originally Posted by kimosadler Insulation will be 'blown-in' polyurethane foam 20 to 60 mm finished with easy to clean vinyl like Manta Cats have. Most quality aluminum boats I’ve seen utilize an insulation material that is cut into sections to fit between the ribs and stringers and adhesively bonded to the inner hull alum sheet.
I might add there was another 59 foot alum cat I inspected in Fl that had really done things proper with respect to the proper adhesion of the insulation material. And finally, remember the cost of the architect is WELL WORTH the fee he charges in the theme of things. Originally Posted by kimosadler I've been searching for plans for a strongall process aluminum sailing catamaran in the 40' to 50' range. So do you think you two fellows could agree on a 'stock design' that would have appeal to the market as a whole? I am looking on Thick alloy boat for a while now and I will participate in a monthly open event on META workshop. Last thing : META is able to deliver Strongall cut metal sheet to weld by your own in France at least. We already designed and built the Galileo 41 and now we want to design a bigger Galileo, combining performance, comfort, solidity again. Guilhem ANDRE adn View Public Profile View adn's Website View adn's Gallery Find all posts by adn Page 2 of 2 < 1 2 « Duflex Panels from ATL, Worth it???
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Reader Ronan Lee has got in touch to ask what the design of this boat in these photographs might be. He has been told that that it was built in the 1940s from plans that might have come from a magazine or book, and that his father learnt to sail in her in around 1947-8. West Coast USA designer Edwin Monk’s plans were very popular around that time from his books ‘Small Boat Building’ and ‘Modern Boat Building’, published by Charles Scribner’s in New York and London.
Does the programme suggest that there is a class of et least eight boats all of the same type? It seems levels of helm experience and boat performance were taken into account to give everyone a fair chance .
This link leads to some notes on the early days of Galway Bay Sailing Club in the mid-1940s, and mentions a sloop called Seagull. The boat appears to be a Yachting Monthly sharpie as we had a fleet of them at the Victoria Nyanza Sailing Club Uganda when I was there 1957-1963. There seems to have been a division of opinion on use of spreaders, but one boat does have the wide set seen on the Galway boat. Have you got news for us?If what you're doing is like the things you read about here - please write and tell us what you're up to. Classic Sailor is a new magazine about traditional and classic boats from ex-Classic Boat editor Dan Houston and colleagues that promises rather more coverage of the traditional craft around our coast.
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Our Faversham-based friend Alan Thorne can help with boatbuilding projects - constructing to plans in very tidy stitch-and-glue or more traditional techniques. Location: Cocoa Beach, Florida Sailing Foiler Design One of the most exciting developments in this field ever is the adoption of lifting foils on the new Americas Cup boats. I think that the altitude control system the teams adopt may shed some brilliant thinking on an important subject for foilers. It seems to me to limit the definition of hydrofoil to one that describes lifting up only as qualifying as a hydrofoil is dated to a period where the concept of a hydrofoil pulling down(like Sail Rockets foil does) was largely unknown. Sail Rockets Main foil has a force vector pulling down and another pulling parallel to a line drawn between the center of lift of the foil and the center of lift of the wing(sail).
Sailrocket is a wind-driven planing trimaran, and I don't think there's any new nomenclature needed to identify it. Location: Cocoa Beach, Florida Sail Rocket So, in trying to understand how the foil works, we ignore that according to Larsen, part of its function is altitude control? If we consider lateral resistance and altitude control it seems to me that the foil is doing what a "normal" surface piercing foil does-except that it creates downforce?
Originally Posted by Doug Lord So, in trying to understand how the foil works, we ignore that according to Larsen, part of its function is altitude control?
But regardless of its stability characteristics, the fact remains that the total force of the foil is comparable to and opposite to that of the sail.
Originally Posted by markdrela I was discussing only force balance, which is not the same thing as stability and control. Your lift formula and Ray's correction are a little confusing for those of us who prefer the metric system. Earlier in post number 7 of this thread I answered a similar question from Olav about conversion from American units to Metric units. For our friends outside the American measuring system, I thought about putting in the book a factor for converting the formula to metric units. For metric users wanting the resulting lift to be in kilograms and the velocity to be kilometers per hour, use a conversion factor of 4.06.
For metric users wanting the resulting lift to be in kilograms and the velocity in meters per second, use a conversion factor of 52.63. For metric users wanting the resulting lift to be in newtons, use a conversion factor of 515.


Location: Cocoa Beach, Florida Sailing Foiler Design Thanks for the info, Ray! I am afraid to say that you have things the wrong way around with our wonderful metric system. Good luck with your antiquated measurement system and all of your brilliantly confusing conversions! Someone called the Coastguard and said they had seen a flying boat that was having problems at take off. I would like to make sme changes to this boat as in adding a sail and adding a cabin coming up from the small wall and leaving between 5 and 8 foot of open deckspace. One last question would this turn out better if i built a small 16' cattamaran first to kinda gain some experience.
Originally Posted by chevyman I have a bunch of questions but im looking to design my own catamaran.I want t be able to fish off of it and go cruise to beaches i was thinking of making it in the 20 to 24 ft range. I look forward to getting a boat in the water that ive built and designed myself.Any help is appreciated Gooday 'Chev'. Sure you could do much better than theat - with todays modern materials - if you choose to make the effort & spend the money.
Location: Arizona I have looked at many of woods designs and if i was looking to buy a boat i would buy one of his in a heartbeat I like the wizard but its not exactly what I want so I figure if Im going to take the time to build this boat Im going to make it how I want it to be rexactly what I want. I thought about designing and building a small fast little catamaran to mess around on between 12 an 16 feet to try my hand at it. I understand most of it except the sail rigging and the bottom of the hull such as keel or daggerboard and the different options. I'm sure I can build a cat that floats, might even go in a straight line (that is an accomplishment) but I doubt I'd really be happy with it, it wouldn't be a work of art and I may not like all the finger pointing and laughing.
Location: Arizona K so I have decided that I will build a 16 foot catamaran to start with it will have and 8 foot beam Im going for speed here so really light im thinking 4 or 6mm ply. The beam of the hulls will be 12-14" I have seen things that argue daggerboards are better than centerboards and viceversa what are your opinions.
I would like to put two masts on it so I can have more diversity with the wind I have seen some called a racing sloop but only on large monohulls like the puma boat.
Im am deciding btwn making it cartopable or trailerable but I was wondering hw hard it is to make a trailer or find a trailer and make it able to tow yur boat.
Also one more thing sorry I have so many questions I was thinking the trampoline for the deck because i know weight slows it down but If i used slats of wood with spaces between them for part of it would it slow me down much say i do half of it trampoline and half of it wood slats? Location: Arizona k I am looking at doing a kinda of mis between a slider and La Chatte 16. And would it be possible to add two masts to a boat of this size or 2 sails with just one mast. You really need to build something from plans first and research for the eventual design before you design your own.
Dagger boards work better if you want the absolute best performance, provided you have a proper airfoil shape.
Nets at the front will work, but if you are sailing they may cause you to flip the boat over the nose if you drive the nose underwater - entirely possible if you have typical sail area - ask someone with a Hobie cat.
If you do the Lachatte, don't even think about the wood center deck - use a trampoline for sailing.
The Quattro will not give you experience of building a dagger or centerboard, but it will get you a good performing boat that is reasonably easy to build, and get you experience. You could probably build a separate rigid deck and see if the original idea above would work for you.
Location: Arizona K I looked at it and I was wondering if it is really worth that much for the plans i cant find any pictures of any ever built or sailed.
Would a boat like this be able to cruise around on a lake like lake pal or lake pleasant in arizona if anybody knows where that is at because that is were most of my use would be and in smaller lakes around the mesa and pheonix area. Location: Arizona Btw how do you go about getting the mast and sails with the rigging. Ive looked at building the mast seems doable but i dont know where to start with the rest of it.
Some of the running rigging - the ropes and pullies to control the sail need to be store bought, one source is West Marine by mail order. Another way to get something like the mast and sails is to buy an old boat and use as much as you can. From this distance it is clear that you would do yourself a favor by buying a Hobie 16 or something similar.
The Mk Links to Dory boat plans many costless Dory boat plans boat building information including plywood stitch and glue. I am not an alum expert at all, so I will make only a few observations about it as a building material for a catamaran..
I am not sure about more global stresses, as the properly designed thin plate construction with stringers and frames may be overall stronger. This allows for different qualities of insulation materials, spot repairs, and far less mess.
In fact I have been in some talks with him about representing that particular design for, and with him.
In fact he was brought in to help with Steve Dashews challenging development of his FPB vessels. R&D plans need to be done one more time cause legal law has changed in France and to meet those new specifications some CAD calculations need to be added.
One, The Yachting Year, Vol 1 (Eric Hiscock – edited) 1946-7 has a very similar design by J. I have the programme of a race held in Galway in September 1944 which has the boat registered as no 8.
Schock… all Americans who published how to build small boats books of plans, including “sharpie” types, before and after WW2. Aren’t the white clinker sloops of the Corrib Rowing and Sailing Club pretty… and doesn’t that straight stem cutter have some personality!


Try scrolling down, clicking on the 'older posts' button at the bottom of this page - or try the search gadget!
And both teams(and Luna Rosa) are breaking new ground that may some day filter down to the rest of us. This means that an 1kg mass weighs 9.81 Newtons whether it is in Europe, Asia, or the West Coast of the USA. How shallow of water could i get to in this i want to use a design like this one i saw on here. What would be a good sail setup for this size I want to get as much speed out of it as possible if that narrows it down. I like the features of the seats in the hulls and the wooden deck on both but would it be possible to add a trampline or net on the bow of them instead of the empty space.I like the sleeker look of the la chatte also.
Centerboards work well - the tornado in your original picture had them and was the fastest daysailor for 20-30 years. The wood deck will keep you from sitting as far out to the edge of the boat as possible, which is necessary if you are sailing fast. A Hobie 14 might be the right size, or you can modify from there, if you can find one cheap on craigslist, etc. Atomic number 8 The Light Trow promiscuous Trow model bundle plywood sauceboat Gavin Atkin boat plan. This boat’s inner alum structure had been painted with an etching primer prior to adhesion of the insulation material.
On the other hand you may have invested a considerable amount in quality gear and fit-out of engines, electronics, sailing rig, etc, etc, and hope to recover some of these monies. Seems to me the foil does exactly what a "normal" surface piercing foil does-lateral resistance plus altitude control?
However, I am pleased to respond to you and provide a factor to convert the formula variables from the American system to the Metric system.
Monitor also used an innovative system that applied some force from the rig to automatically adjust the angle of incidence of the foils to create righting moment. We built a 40' x 17' very fast sailing cat - that fully crewed - with 2 weeks cruising gear for 4 people that had a maximum draft of 12". There is also a company called Sailrite who will make up a kit so you can sew your own sail, they also provide directions.
Welcome to perfectly justify Plans in this division you bequeath find free boat building plans including accessories and construction techniques.
I once saw a beautiful newly constructed 53 foot French cat down in Lauderdale that had had foam sprayed the inner surfaces of her alum hull. For instance, have a look at the photos I found of that alum cat I spoke of as being put together marvelously with lots of attention to detail. If these quality items are on a clunky vessel it might prove to be much more difficult to recover your investments. I also have quite a mailing list I would like to go back thru and present this alternative. These files can save considerable time in construction as well as avoid costly mistakes in cutting all the alum pieces. So we design a catamarans in the same spirit, that is to say strong, simply and ready to brave all conditions in all seas but with all modern innovations. You will see that multihull design is a much more complex exercise than merely drawing a boat. If you wanted to use this as a fishing boat sometimes, make a hard deck to stand on which can just be set over the trampoline, resting on the crossarms and decks - a separate add on piece just for fishing.
I was able to get digital drawings printed at Office Depot for $3 per page for 2'x3' drawings.
You can make your own rigging using a $20 tool from Home Depot or Lowes and the thimbles, swages, and wire. If comfort has anything to do with wants then forget cats and get a decent mono like a Lightning, Thistle, Highlander, Flying Scot, O'day Day Sailor (has a small cuddy). Particularly since light-weight is an important factor in the performance and weight carrying capabilities of multihulls. There was some sort of defect in the welding job that was going to have to be corrected, and the huge job of getting all that foam and its residue unstuck and washed, and etched from that alum structure was going to be so costly and intrusive to the cosmetic interior installed already, that the boat was declared a total lost and sold for salvage value.
Remember the cost of the hull and deck structure of a vessel is probably only 20-25% of the total cost of building a vessel.
These Coefficients are dimension-less and may be inserted in both American and Metric formulas without conversion. If you have not built one before you will encounter all kinds of different questions when connecting the hulls. Free plans have a Wacky Lassie Sculling training boat absolve classify of dugout canoe skiff and jonboat plans Plank. The homogeneous sheet aluminum material lacks the rigidity of the steel and sandwich composite. Besides the lighter weight vessel just might make her less susceptible to impact damage by virtue of carrying less momentum into the impact incident.
I believe I have detected that you (kimosalder) are not concerned with the looks that much…just a good tough vessel?? If they want something smaller, send them to the production vessels…for something larger, it will involve a custom design. There is a small cat build in the design thread titled WTEOTWAWKI something or aruther as an end of the wold as we know it boat, by Hoyt. The first was built by Johnson & Jago of Leigh-on-Sea, Essex, for Miss K M Palmer associate editor of Yachting Monthly. Note that the many comments re the Snipe similarity are a reference to another Crosby design: the Snipe being his most popular.



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