| 摘要 |
The sandwich structure comprises a calibrated core (4) in soft foam, e.g. polystyrene, with a skin (3) especially in glass- and carbon fiber. This is initially adhesively-impregnated, especially with epoxy resin. It is then polymerized under vacuum, flattening it down. The sandwich structure comprises a calibrated core (4) in soft foam, e.g. polystyrene, with a skin (3) especially in glass- and carbon fiber. This is initially adhesively-impregnated, especially with epoxy resin. It is then polymerized under vacuum, flattening it down. For lightness and flexibility, a hull zone can be made more sensitive to point impacts (than in conventional practice), being only stressed by the water. This also avoids too much bouncing resulting from excessive rigidity in the assembly. Longitudinal reinforcement allows control of flexural rigidity when the board is used out of balance, to the front or to the rear. This reinforcement is especially made of unidirectionally-aligned carbon fiber. Polyurethane-based paint, or other protective finish is applied. An Independent claim is included for the corresponding method of manufacture.
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