Our current boat uses 10mm thick cedar strip planks with 2 layers of fiberglass cloth on both sides,and west system epoxy on the outside. adding about 7-8 mm to the thickness. the duflex balsa composite board bulkheads are 22 inches apart from each other.. Moulding fibreglass. common uses include boat hull repair, fuel tank construction and chemical storage tank linings. like polyester resin, it is catalyzed with mekp, but vinyl ester has a shorter three-month shelf life. the heaviest fabrics are generally used for rapid thickness build-up, such as in boat hulls and mold making. fabrics. Fiberglass (us) or fibreglass (uk) is a common type of fiber-reinforced plastic using glass fiber. the fibers may be randomly arranged, flattened into a sheet (called a chopped strand mat), or woven into a fabric ..
The plywood should have a roughened border to improve adhesion of the resin when the bulkhead is bonded into the hull. in small boats the thickness of the plywood is normally adequate for stiffness but some pillaring may need to be added in larger boats. all openings in bulkheads should be radiused to avoid local stress fractures.. A core in a laminate makes it stiffer with little weight penalty. if a hull laminate has been reduced in thickness by the use of hi-tech reinforcements, the stiffness lost due to thickness can be re-gained to the same or greater extent by the use of a core.. Normally it is used in the body of a laminate only in small boats or in race boats and high-end performance cruisers where saving weight is a priority. it is sometimes used as an outer finish layer in laminates in larger general-purpose boats, as it does not “print through” a surface coating of gelcoat as easily as woven roving..
Fibreglass Boat Hull Thickness