I was reading on the Farrier site (and the site where the F-39 builder is using infusion) about the heat molding of foam over planking to do one off hulls. On average, how many layers of fiberglass with epoxy go into typical boats on the inside and outside of the foam?
Sorry for all the questions, I just really want to lean more about composite boat building (for academic purposes only). Chris Ostlind Previous Member   Write to Henny (the guy building the vacuum infused F boat in Netherlands) and ask him a few questions.
Chris Ostlind Previous Member   Farrier says it isn't necessary to bag or infuse his boats. Location: Port Gamble, Washington, USA Henny van Oortmarssen has been using infusion to build a Farrier F-39, and he has a great website that talks about the whole process. If you were to heat form the foam, remove it from the mold and vacuum bag it, would the vacuum deform the foam or does it just produce normal forces on the laminate? If this does deform the shape and you choose to vacuum bag you would have to lift the foam out of the mold put plastic down, put the foam back, seal it then somehow brace it to the mold framing. Tor is using vacuum bagging along with the resin infusion process but note that I do not recommend infusion for hulls unless you really want cleanliness, or would just like to try the process. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Students and tutors at the Boat Building Academy are to launch a record twelve boat building projects by the September 2010 group on June 7th. The event details are available here and the BBA folks would like to invite everyone to join us in the celebrations. With 18 days to go, principal Yvonne Green says the workshops have never been busier – every spare inch of space seems to be occupied by a boat or a bit of a boat. Yvonne adds that while the students (and staff) will probably be shattered by launch day, the boats will be glorious. Paul Gartside-designed 12ft traditional clinker dinghy, built in larch and oak with a grown stem and knees. Spitzl classic German 4.4m lake rowing boat, built traditionally in clinker mahogany on oak.
Diamond Half Rater originally designed by Charles Sibbick in 1897 6.5m long, it is a replica created on the lofting room floor from photographs, a couple of similar lines plans and the only other existing replica Half Rater from another (American) designer that is owned by Rees Martin, a great friend of the Academy. 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. Enter your email address to subscribe to this blog and receive notifications of new posts by email. Follow me on TwitterLooking for something?This is a busy weblog, and what you're looking for is probably still here - just a little way down the list now. Our Faversham-based friend Alan Thorne can help with boatbuilding projects - constructing to plans in very tidy stitch-and-glue or more traditional techniques.
4 or 5 have been built and a few stretched versions are on the verge.This is the original at 12 ft long and 4 ft wide.
Location: Alliston, Ontario, Canada If you click on user CP you can see if anyone has docked you points. 12'x 4' though it would be a lot more stable at 5' or better in beam, though it's efficiency will drop quickly.
This shape will handle chop and passing powerboat wakes much better then the floating shoe boxes others seem to enjoy.
The design above will easily out perform any of the shanty boat, box boat or square micro cruiser thingies.


Having said that i can once again assure you that you dont want to go that fast in a 12' x 4' (4m x 1.2m) boat. Boat Building Academy students Mike Tyler, Jon Bicknell and Andy Blundy built this strip-built South Bay-style catboat to a design worked up by the students with the help of instructor Mike Broome. Mike Tyler is now at Pangbourne, Reading, and involved in setting up the new Beale Park Maritime Museum. Jon comes from a background in information technology design and Jon worked predominantly with Mike on Lucie – although did spend an hour here and there on other builds. Having finished the course is now busy finding his feet in the boat building industry.
I am part of a team of volunteers at the Long Island Marine Museum where a full size Gil Smith Catboat was newly built several years ago.
Boat Building Academy student Ian Baird’s project to build a replica of the rare Dorset crab and lobster boat known as Witch of Worbarrow during his course is continuing apace, as it must to be be ready for the big launch on the 9th December. Ian, who was a novice woodworker at the beginning of his nine month course at the BBA, has been commissioned to write three articles on his experiences for Watercraft Magazine. The launch of the BBA’s March 2010 project boats will take place in the harbour at Lyme Regis, Dorset, at 9am on Wednesday 9th December 2010.
Location: San Francisco Boat building workshop I am hosting a four day hands-on boat building workshop in my backyard in San Francisco. Location: Tasmania,Australia Its a great twist that Derek has - get paid to design a boat, then get the builders to pay for the privilege of building it too. I would like to hear from any Kelsall design builder who actually finished a boat without Derek being on site to supervise the KSS method.
Location: San Francisco Actually, when Derek holds a workshop the builder, who is usually building his own boat, gets all kinds of free help as the class works on part of their boat and Derek is onsite to answer questions that come up, both of which benefit the builder. Also, this design is not a Kesall design - it is a resurrected Micronesian design from hundreds of years ago.
Originally Posted by pedruperez Actually, when Derek holds a workshop the builder, who is usually building his own boat, gets all kinds of free help as the class works on part of their boat and Derek is onsite to answer questions that come up, both of which benefit the builder. I have been a fan of his work since his first plywood designs, and his innovative work in plywood.
Location: San Francisco The 47 foot Chamorro Flying Proa that we built using redwood took two years to build and cost about $20k just for materials, and that was in California, not in the Marianas where it would have cost three times as much. Now that we've built the proa it has become a cultural treasure - it is the first one in over 250 years.
We consider that if we can teach the younger generations how to build and sail again and if we can get 500 Chamorro Flying Proas on the water at the same time once again, that we will have recovered our maritime tradition.
Our plan to get to 500 proas is to build three canoe houses - one on Guam, one on Saipan and one in San Diego where there is a large Chamorro community.
I also suspect that foam and glass will survive longer than timber in the marine environment, which would make it good value.
Even so, have you done the detailed costing of marine plywood ( not timber ) with say epoxy ? If you want to teach people to build boats, plywood is by far and away the easiest technique - especially if you want to get 500 + boats in the water. Location: Duluth, Minnesota Cool, i dont know how i didnt know that, i learnt something today. Location: Tasmania,Australia Yes, he may have started early on foam, but not exclusively since the 60's by any means.
I am still curious if you have actually done the costing between ply and foam, considering you have so many boats you want to get in the water.
He has also prepared a nice DVD of his process along with a suggested materials listing so that you, too, could infuse your own multihull (or most any other boat, for that matter) The price for the DVD is extremely nominal compared to the learning experience that it represents on Henny's dime. Vacuum bagging hulls alone is also nice, and will give a superior product, but it is also not necessary and will increase building time.


Try scrolling down, clicking on the 'older posts' button at the bottom of this page - or try the search gadget! You would have to reshape the bottom which would preclude planing with a motor so you would be stuck maxing out at about 5 or 6 mph. It looks like a boat, it has full standing headroom, requires very modest power and will leave a clean, unmolested wake. You will soon see that you want to cruise comfortably with sitting head room under the cabin roof to escape the sun. However, he seems to be a man of many interests: previously he had studied sculpture at art college, where he frequently worked with driftwood, and dreamed of becoming a boat builder. The pic Im thinking of has two heavy unrigged clinker rowed boats on the beach and I think a group of women with nets and fish baskets, I have a print here, somewhere but cannot find it. The builder asks Derek to host a workshop, not the other way around, and the builder doesn't pay for the workshops.
The traditional material was the wood from breadfruit trees that were abundant on the islands, but it is not available today due to loss of undeveloped land and the greatly increased instances of super-typhoons in the last 20 years that knock down the taller trees. The fact that the material isn't wood is not ideal, but on the other hand the Chamorro flying proa is a Chamorro invention and the design is unique in the world, so we reason that whatever material is used, it is a Chamorro proa. The idea is that anyone who wants to build a flying proa can just pay for the materials and go to the canoe house to use the table, tools, etc. I know he has been doing foam core cats and tris since Toria in the 60s, one of of not the earliest foam core multies. Vacuum bagging is only recommended for flat panels like bulkheads, where it is very easy to do, but again, not necessary.
The one in San Diego, with a make-shift tarp sail that is only 70% of the proper size has hit 15 knots. Say if you were looking at her from the side, she would look like her bow is flat (like your design) but on my design, her bow come to an edge and you can see that looking from the top. It's a fine arrangement if you're needs require the few things they actual offer, but your needs aren't as suited to a mud motor as you might think.
We don’t see a lot of Catboats but I reckon they suit our sailing grounds remarkably well. This proa is currently in the San Diego Maritime Museum, on the water until the end of July. We will build a 25 foot proa hull and outrigger and there will be demonstrations of how to build catamaran hulls. The reason for that number is that in the old days, in the 1600s and 1700s, Europeans arriving in the islands reporting seeing hundreds of proas on the water. Now we want to build more using modern materials that are less expensive and for this we have chosen the KSS method of foam resin infusion (foam infused with polyester resin sandwiched between two layers of fiberglass using vacuum bagging). Any material has to be shipped in and foam, resin and glass is much cheaper to ship than wood due to the weight and container space. The cost for the four day workshop is $750 for the entire workshop and includes coffee and lunch each day. The sailing tradition was completely lost during Spanish colonization when the Chamorro population dropped from 80k to 2k people due to disease and war, and the Spanish forced all the Chamroros off the 14 northern islands and onto Guam where they were forbidden to build proas or even to sail off the reef.
If you've never built anything out of fiberglass, this workshop will give you the practical skills and knowledge to build a boat.



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