[quote=Edchris177]I had one on my 5.7, but I almost never used it, so I went to set & forget. You could not adjust with the jib furled, but once the jib was fully out, all the twists were eliminated. I left the 5.7 with a clam cleat attached to the top of the drum, before sailing, just pull the line to desired tension & cleat. You could luff up, step forward on the hull & recleat if you wanted to, but that’s not really “on the fly”, & it’s a big stretch if your Mystere is 10’ beam.
My little Dart can be adjusted on the fly. It’s a hanked on jib, & if the tension isn’t right, sometimes the leading edge turns inward, especially pinching in strong wind.
The setup is pretty simple. Jib is tensioned vis the halyard. When fully out, the halyard has no twists up near the turning block. Just undo the halyard from the cleat at mast base, pull to whatever you want, & re-cleat. When you furl the jib, I have to first release some tension. The halyard sort of winds around the forestay with the jib.
In actual practice I almost never bother, but I can see a slight advantage if the wind were to die right off from Force 5.
The Dart has a pretty small jib, it’s not many turns to furl , I can’t remember how many my Mystere 6.0XL used.[/quote]
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