| 摘要 |
A mark for sailboat racing having three inflatable elongated tubes joined closely at one common end so that when inflated, a mutual repelling force is developed at the common end causing the outboard ends of the elongated tubes to move away from each other. Lines join the outboard ends of the tubes so that their movement is limited to forming a tetrahedron. The outboard ends of the elongated tubes can be pushed together and constrained for transportation and storage.
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