| 摘要 |
A keel structure (9) adapted for use on sailing craft, comprising a pair of like dimensioned keel members (10, 11) each of which is connected at an upper end to a hinge means (12), the keel members (10, 11) each having an inner surface (8) which in a first position co-operate to form a keel (6) and means (13) to permit the keel members (10, 11) to be hingedly moved in a manner such that when moved out of the first position, the effective length of the keel (6) is reduced. |
