hmmm - First, I believe Erik has North sails? North makes the jib to the class maximum measurements which makes it hang up on the mast pretty aggressively. I think the girths are about an inch longer and the luff is a couple of inches more than the Banks jib. I can't tell any performance difference though...
These comments about the jib are making me think about some of the questions (and potentially answers) that have come up about setups.
I came to the Swift after a brief stint in the 49er, and 49er sailors religiously measure the bend between the hounds and the boom. I carried this habit into my Swift sailing without thinking about it and assuming that things would be a bit different, which they are. I also assumed that everyone was getting their shroud, forestay, lowers, and vang settings using lower bend as one of the guides. Am I right - or?
A couple of very general observations are:
- Robin has complained about occasional speed issues, and frequently about wrinkles that he doesn't see in other people's rigs.
- I worked with lower bend pretty religiously for the first couple of seasons to get myself and the boat on the same page, and haven't thought about it since. Once I had numbers that seemed to work, I just used them and forgot about low bend.
The concepts that I remember are:
- light sailors will have slightly more low bend than heavy sailors
- more low bend makes the mast (and therefore the boat) a bit softer and more forgiving, and the opposite is also true
- heavy sailors make the mast (and therefore the boat) a bit softer and more forgiving, and the opposite is also true
- low bend reduces power in the lower 1/3 of the mainsail
- low bend is tightly correlated with lowers and vang tensions, and this interaction has complicated effects on the rig
A few conclusions might be:
- given that every jib I have used, with any setting I have chosen, has caught at least a little bit on the front of the mast, Robin's mast step may be a little farther aft than mine and/or he is using a straighter lower mast than I do, which may account for the different sail cloth wrinkle pattern. Sometimes Robin is faster than I am, so maybe we should learn something from his setup.
- perhaps sailors that complain that the boat is unforgiving have not compressed the mast enough for their body weight, i.e. lighter sailors should use higher shroud tensions which will allow the mast to bend more easily
- Heavier sailors that have speed issues should probably take a page from Rob Harper's playbook. He tends to use all his settings much lighter/looser than I do. And it works. He is also often faster than I am.
- For beginners while learning, a good setup might be enough extra tension on all the shrouds and controls (except the uppers and the vang) that the boat becomes a bit underpowered/lazy/unresponsive. *note - the vang must have just enough tension that you can flip the battens when you tack or gybe.
Does anybody else have comments?
Philip