Marine plywood manufactured to as/nzs 2272 standard, is a structural plywood intended for hulls of boats and other marine applications. it has a type a (wbp) phenolic bond glue and is manufactured from woods based on density, bending strength, impact resistance and surface finishing characteristics.. Plywood set at +/-45 has the best shear strength and stiffness for that type of wood, and hence in theory makes a better shear web than plain wood or plywood set at 0/90. but this assumes that web's glue joint to the spar cap is stronger than the plywood, which is not easy to do.. Aircraft plywood must meet the mil-p-6070 specification that specifies testing for deviations of thickness, moisture content, tensile strength, gluing strength, bending, torsion and immersion in water. tropical plywood. tropical- or marine-grade plywood may be used for boats but also appears in construction, especially in southeast asia..
The canadian plywood design link was new to me and did have a formula for calculating the bending strength of edge loaded plywood if the bending strength for panel loading is known. this was for douglas fir plywood.. Molded plywood is as strog as, if not stronger, than glass reinforced plastic and certainly lighter for a given strength. the predominance of grp in yachts arises from the fact that it is easy to construct with relatively unskilled labor and the materials are relativel inexpensive.. Plywood is among the strongest of all building materials. the strength is a result of individual grain layers placed perpendicular to each other bonded with glue under high pressure in the.
