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[quote=windwardde][quote=davefarmer]I think most of us are using 5/16" (8mm) or 3/8" for the mainsheet, smaller runs smoother thru multiple purchase blocks, and is harder on your hands, bigger is more comfortable, but runs a little slower.  5/16" is probably fine for your jib sheet, as the load you're applying is not large.  And I doubt a dyneema or vectran cored line is very important for the jibsheet, more so for the mainsheet.   You could also check riggingonly.com and sailcare.com for slightly better pricing, although more limited selection than say apsltd.com.[/quote]

I also use 3/8" for the mainsheet and 5/16" for the jib - fairly common.

[quote]Martin's reference tells me the length is 10 meters, but I've added length to small line that runs up to the clew of the jib. I understand that means that my jib line may not need to be that long. And I've got a ton of line on my tramp.

What's the best way of determining the true needed length? [/quote]

Likely not the best way, but I simply set it up at a few more feet than I thought I needed and then went out and sailed at various tacks and on the wire. Looked at worst case scenarios when running down wind and farthest back on hull while on the wire. If I still had "too much" line on the tramp, I noted it and shortened it when back at the beach[/quote]

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