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Dagger-board evaluation for an IMOCA 60 yacht

机译：IMOCA 60游艇的匕首评估

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The IMOCA 60 Class has a complicated set of appendages: with canted and tilted keels, cambered dagger-boards that can be designed to be fitted to the hull in different orientations along with toed-in and twin rudders that can also be configured in different orientations. Curved dagger-boards and straight boards with positive lift inducing dihedral angles have been used in a number of recent IMOCA 60 designs and in other classes, principally multi-hulls. These were considered an option by the client for their new Open 60 design and so a research and development programme was instigated by Owen Clarke Design to compare new curved designs with conventional straight dagger-boards optimised for upwind conditions. It was felt that the modelling of the trim of the yacht was very important to the calculation and sharing of loads between all of the appendages, and so our group chose to use a combination of one third scale high speed towing tanks tests and computational fluid dynamics (CFD), rather than CFD alone to investigate the relative performance between these dagger-board types.
机译：IMOCA 60类别具有一组复杂的附件：带有倾斜和倾斜的龙骨，可设计成以不同方向安装到船体的弧形匕首板，以及也可以以不同方向配置的趾式和双舵。具有正向升力诱导二面角的弯曲匕首板和直板已用于许多最新的IMOCA 60设计中，并且在其他类别中（主要是多壳体）已使用。客户将这些视为新的Open 60设计的选项，因此Owen Clarke Design发起了一项研发计划，将新的弧形设计与针对迎风条件进行了优化的传统直式匕首板进行比较。人们认为，游艇内饰的建模对于所有附件之间的载荷计算和分担非常重要，因此我们小组选择结合使用三分之一比例的高速拖曳舱试验和计算流体力学（CFD），而不是单独使用CFD来研究这些匕首类型之间的相对性能。

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