| 摘要 |
A device for controlling the swinging of the boom of a sailboat, comprises a line fixed at its opposite ends to opposite gunwales of the boat and passing intermediate its ends about a sheave carried by the boom. The sheave can be non-rotatable, in which case braking effect is achieved by providing at least one dead turn of the line about the sheave. In this case, guides carried by the sheave are preferably provided for preventing overlapping of the turns of the line. Alternatively, the sheave can be rotatable, in which case braking can be provided by brake shoes progressively applicable upon rising movement of the boom, which is the condition characteristic of greater wind pressure against the sail and hence greater tendency for the boom to swing quickly. |
