divinycell boat building

Thanks to cores, boats have better performance and enhanced creature comforts. SCRIMP's closed-mold technology brings styrene levels down well below today's stringent standards, and eliminates the need for the costly exchange of heated air. Copyright 1998. How strong should the skins be? by jacquesmm Sun Sep 16, 2018 5:43 pm, Users browsing this forum: No registered users and 0 guests, Powered by phpBB Forum Software phpBB Limited, Style we_universal created by INVENTEA & v12mike, Facebook Seamanship, Navigation & Boat Handling, Rules of the Road, Regulations, & Red Tape, http://www.fiberglasssupply.com/pdf/moformDiab.pdf. Leading builders are building stronger, lighter, more durable boats with epoxy composite construction. Google The skins should be as thin as possible, consistent with strength, stiffness, ease of lay-up, and overall hull durability. Lightness means less weight to move through the water, so speed is faster. The most common core materials utilized in building boat hulls and decks include balsa wood, PVC (polyvinyl chloride) foam, SAN (styreneacrylonitrile) foam, and honeycombs made from aramid (Kevlar), plastic, and paper. As air is removed, the outside air pressure presses the core uniformly into the entire surface of the skin. Press question mark to learn the rest of the keyboard shortcuts. In a single-skin laminate, the outside surface is in tension, the inside surface is in compression, and the middle is in shear. Shear is the tendency of the inside and outside halves of the laminate to slide against each other in opposite directions. With all my over build the completed hull is 150lb. Foam is really easy to work with too. And because cores are very lightweight, the cored-skin laminate weighs less than the single-skin laminate. Over the years, thousands of composite recreational and working boats have been built and the earliest are still going strong. All Rights Reserved. Everything from strip canoes to work boats, high performance multihulls to offshore racing powerboats have been built using epoxy composite construction. But a cored-skin boat designed and built with care will last for years, while you enjoy the extra performance and creature comforts. Balsa, PVC and SAN foams require special putties to assist in bonding the core to the outside skin. Most widely used throughout the world, balsa core is made with the wood grain running from skin to skin and is termed end-grain balsa. However, as with wood, polyester resins have been plagued by the effects of moisture penetration. Here follows some pictures. A NEW INTEGRATED MATERIALS TECHNOLOGY Combining the best of wood technology with the advances in FRP materials and processes, leading builders have turned to composite construction to produce durable, distinctive boats. The weight of different cores is less important because they tend to be only a small portion of the total laminate weight. Idk another guy and I are both building the Conchfish. SCRIMP(tm) is a process called resin infusion molding. It is available in a broad range of densities, from 3 lbs./cu. The putty is spread over the skin before it cures, then the core is pre-coated with resin and pressed into the putty. Use proper engineering and design procedures. Linear PVC is not chemically cross-linked and does not break when bent. Composite construction has proved itself at the top levels of competition in sail and powerboat racing, in the harshest environments and under the toughest working conditions. Im curious How would you say divinycell foam compares to plywood in terms of forming? SCRIMP(tm) involves using a vacuum to force resin through a laminate at a controlled ratio. To resist all these stresses without fracturing, a single-skin laminate must be relatively thick and heavy. Simply wet out the scrim and lay up your polyester or epoxy laminate directly onto the scrim. My v12 was my first build. The SCRIMP(tm) process can be used to infuse thick laminates with the same high quality results as a simple 1/8" laminate. Can anyone give me the pros and cons of divinycell foam, Location: Thunder Bay, Ontario - 48-29N x 89-20W, Look at any penetrations of the cored areas. And, depending on the engineering circumstances, a low-density, thick core could have the same weight as a high-density thin core for the same shear strength and stiffness. Note, however, that the heavier balsa core is less costly than the lighter balsa. In general, balsa and aramid honeycomb are stronger and stiffer in shear than the other core materials. Compared to polyester resins typically used in fiberglass boat construction, epoxies have greater strength, less shrinkage, better moisture resistance and better fatigue resistance. Each kind of core requires slightly different laminating techniques, and different building crews tend to have developed their own preferences. Photo Credit: Sabre Yachts. Can Divinycell be used in place of marine plywood for the V12? The laminators cannot see if the core is in perfect contact to the skin on every square inch of surface. ft. density. Corebond and a vacuum bag would work well if the shape was supported. Just recently (late 1999), Baltek has announced the availability of SuperLite, a range of lightweight balsa cores from 4.9 to 8.7 lbs./cu. The choice as to which core is best for a particular design usually reduces to which core is the least expensive for the greatest strength and stiffness. Finally, thin laminates are not very durable against minor impacts such as the hull bumping against a dock. Divinycell foam are compatible with virtually all commonly used resin systems ( vinyl ester, polyester and epoxy) and has been used in land transportation, marine (pleasure, military and commerical) wind energy, civil engineering/infrastructure and general industrial markets. It comes in only two densities, 3.8 and 5.5 lbs./cu. by Jeff Fri Sep 14, 2018 8:02 am, Post Im doing it in foam and Im at just over 19 gallons. WHAT IS EPOXY COMPOSITE CONSTRUCTION? Lenny is a graduate of the Westlawn School of Yacht Design, and he has won numerous BWI and OWAA writing awards. Jeff. Questions before purchasing the plans and announcements.. Cracker Larry's Corner: Boat Repair and Rebuild Support, Core Materials: Plywood, Foam core and Honeycomb, Builders' Tips, Tools, and Tricks of the trade. Cores, however, must be quite thick, and so the total thickness of the cored-skin laminate is more than a single-skin laminate. This makes the cored-skin laminate stiffer. Properties are from manufacturers' published data for approximately 6.0 lb./cu. boats.com, 1221 Brickell Avenue, 23rd Floor, Miami, FL 33131, USA. I agree with too as you will use more glass. They must be perfectly sealed against. I have therefore developed a unique building method. Because the SCRIMP(tm) system achieves equilibrium resin content (50% to 70% fiber weight, depending on fiber architecture), unlike most composite processes, it is inherently repeatable. The resulting structure has physical characteristics superior to the components by themselves. Questions before purchasing the plans and announcements.. Cracker Larry's Corner: Boat Repair and Rebuild Support, Core Materials: Plywood, Foam core and Honeycomb, Builders' Tips, Tools, and Tricks of the trade, Builder's Progress and non technical messages. Stiffness means the hull does not flex out of shape, which would increase hydrodynamic drag and slow the boat down. Is divineycell foam same, better or worse? by Jaysen Sun Sep 16, 2018 7:07 am, Post Environmentally responsible, SCRIMP(tm) is a completely closed system that traps VOC emissions instead of sending them up the stack. Through epoxy composite construction, the builder can offer boats in a wide range of designs, materials and construction methods. Because of this separation of duties, the skins together can be less thick than the total thickness of its single-skin counterpart. My 1989 Swan 43 has Divinicel cored decks (and longitudinal hull stringers). The in-depth series gives viewers exclusive access to the innovators and craftsmen behind some of the best boat brands in the world and a firsthand look at the latest boat building techniques and materials used inside their plants. With virtually no size limitations, the SCRIMP(tm) process can produce large and small components, as well as complex, multidimensional trussed parts. Diab Inc. markets putties called Divilette (for Divinycell), K-Lite (for Klegecell), and ProBond (for ProBalsa),. SCRIMP(tm) saves labor and time with dry lay-up. To vacuum bag a core, laminators first lay a bleeder cloth over the core, and over that they drape a large sheet of plastic film the "bag" and seal its edges all around with a special thick, sticky, sealing tape. ft. The thicker the core, the thinner the skins can be, and so the lighter the laminate. By understanding how a boat's structure is designed and how it works, you can compare these core materials for yourself. A few words about why I chose the balanced lug sail. Plywood can at least do single curvature reasonably well, but cant do compound curves. Advantages of Epoxy Composite Construction, Nomex, with aramid fiber, is made by Hexcel Composites, Dublin, CA, Plastic, Nida-Core, from Nida-Core Corporation, Hoboken, NJ, Paper, called Tricel, from Tricel Corporation, Gurnee, IL. 9, Factory Fridays: Twin Vee PowerCats Pioneers Boat Building Innovations, Understanding Foam Cored Boat Construction, Factory Fridays EP. Polyester resin composites are porous, so water can readily seep into the laminate by osmosis. ft. Honeycombs used to be pretty expensive (some still are), and as such, were rarely used in production boats and only in the most expensive one-offs. SCRIMP(tm), unlike prepreg, does not require refrigerated storage, time-consuming debulking, breathers, bleeders, and porous releases, or the scrap associated with bridging. The panels of a boat's structure must be designed to withstand a number of different stresses. By Eric W. Sponberg, Naval Architect The following article first appeared in American Sailor magazine. ft. to 25 lbs./cu. I too did more layers of glass than what would be used on wood. by topwater Sun Sep 16, 2018 7:40 am, Post All Rights Reserved. With over two decades of experience in marine journalism, Lenny Rudow has contributed to publications including YachtWorld, boats.com, Boating Magazine, Marlin Magazine, Boating World, Saltwater Sportsman, Texas Fish & Game, and many others. Photo by Regulator Boats. Different density and or thickness will determine how long it takes. Just wondering your method. Then vedges were glued betveen the quadrangels, held in place with nails untill the glue set. Not only does this eliminate the need for masks, gloves, and protective clothing, but it means a cleaner, healthier production setting and environment. Two densities of balsa are shown. Because lay-up is performed with dry materials, workers are not exposed to wet resin. by garym Thu Sep 13, 2018 4:54 pm, Post Designers, builders and owners have more choices available. Next step is to shape the foam. The Divinycell i bought frome store over here is prescored and that makes the forming a nobrainer. Try not to heat beyond 185f as youll start to melt /burn the core not good. Epoxy provides a stable base for paints and varnishes, reducing the frequency of refinishing. The basic guidelines that designers and builders must follow are: Most cored/laminate failures can be traced to a violation of one of these rules. Delamination would be my worry. Since the moisture content is stabilized, the maintenance problems associated with wooden boats - rot, joint cracks, structural members swelling or shrinking, and surface checking - are eliminated. Above: From innovative marine propulsion systems and cutting-edge onboard technology, to the advanced physics of computerized hull design, boat builders share their fascinating stories and unique approaches to constructing and engineering a variety of watercraft in the Factory Friday video series from boats.com.

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