[quote=randii][quote=klozhald]Keep in mind that in an 8:1 system, 8:1 is also the ratio of rope on deck compared to movement of the sail up and down.[/quote]
Yup. The physics of straight reduction relates effort reduction to increased length of line. Cascades cause less of that, but you can go too far the other way, and not be able to make fine-tune shifts.
[quote=klozhald]On cascade systems, you must plan carefully. You may not have the distance on your mast, between the main clew and the mounted cheek blocks, to be able to pull the compound blocks tight enough.[/quote]
Yes, so you’re constrained vertically in travel between the tack, the mastbase, and the various blocks, and with the H18, you also have to work around the fixed gooseneck… AND all of that has to work vertically in the range of the sail/mast’s 8-inch-or-so downhaul capacity. Complicated!
This was one of the reasons I thought it would work well to get a cascade directly off the tack grommet, as opposed to hooking blocks through that grommet and hanging them down (that burns height). The 5:1 system I have isn’t bad, and the line never dribbles off the tramp, even pulled hard… 5X line is less than 8X line.
[quote=MN3]regardless of your system - you have a very stiff mast and are not gonna get much bend compared to modern masts[/quote]
Certainly. Especially with the all-aluminum mast I’m using. The comp-tip mast I have needs some work… but would probably respond better to downhaul.
[quote=MN3]if your rigged w your 5:1 - and used to it . i would keep it - at least for now[/quote]
That’s the plan… and light air this weekend won’t need a lot of downhaul regardless.
Change one thing at a time… and Whirlwind squaretop laminates should be a nice change/boost over the dacron rags I’ve been flying. I’m looking forward to feeling how the sail responds to puffs NOT pulling through stretched and aged dacron. Upgrading the sails takes a few variables out of the mix, and leaves me less things to blame… it is tougher to tighten the loose nut connecting the tiller extension and the sheets!
Randii
p.s. I still don’t get how two separate 1:2 side-by-side pulleys cascading into the same 4:1 simple advantage doesn’t somehow result in more than 8:1 advantage. Looks like I may have to buy a rigger a few drinks to get to the bottom of that one![/quote]
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