Catamarans
Twin rigs you (I) tend to break them relatively easily, gearboxes need to be in good condition infact excellent or don't bother as that's where you'll have your first set of problems, then the hull its self could do with being either very good condition (preferable not wood;-)) and as exceptionaly strong or again big problem, I'm sure there is the exceptions but that is my experiences and still not having to much fun, getting a cheap hull usaully means your getting what you pay for,
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