D
Don Guillette
Mates; After seeing the devestation of boats as a result of Katrina, I have to force myself to write anything about sail trim because I'm just sick seeing all those beautiful boats stacked up like cord wood. One I saw was perched on the second floor overhang of a building that looked like a Home Depot. They will probably have to take a chain saw to that boat to save demo time. I know how I would feel if any of those boats were mine. Just try to imagine what it would be like the first time you get to see your boat in those condition. I'd probably throw up on the spot. Anyway, here's a short piece on fairlead placement. The fairleads primarily control twist. Moving the fairlead forward DECREASES twist. When you decrease twist you power up the sail because you are closing the top of the sail or making the leech of the sail straighter. Moving the fairlead back INCREASES twist. When you increase twist you're depowering the sail because you are opening up the top of the sail. The bottom of the sail looks like it is closehauled while the top looks like it is on a beam reach. The top of the sail is spilling air and that is what depowers it. The problem with understanding twist is Less twist equals more power and more twists equals less power. I had an awful time trying to understand that concept!!Why do we care about twist in the first place? The reason is explained in the previous paragraph - your controlling the power of the sail just like you would the accelerator on your car. Why don't mates use the fairleads more instead of just "setting and forgetting" them. The reason is because the pin type fairleads are a pain to deal with. With a system like Garhauer makes, adjustment is a snap and fun.How do you find your fairlead starting position? Easy, just pick some spot on the track - for some it will be the spot where the fairlead is rusted in place!! Now turn the boat into the wind and watch the telltales and leech of the sail. The idea is that you want the telltales or the leech to BREAK evenly from top to bottom. Rarely does that happen but you want to get as close as you can to that.If the top telltale breaks first you have too much twist so you want to move the fairlead forward. Move the fairlead forward a couple of holes and try turning into the wind again until you find the correct spot and then make a mental note of the position. If the bottom breaks first, the sail need MORE twist so move the fairlead aft a couple of holes and go through the same proceedure. Here's the problem with all this - the wind is constantly changing so to keep your jib always powered up you have to be constantly messing with the fairleads. That is why an adjustable fairlead system is so important to the sailor who wants to get the most out of his jib. Any questions or comments?