Title: Jibe: technique de base
BossOnline - April 5, 2007 02:10 AM (GMT)
BossOnline - June 7, 2007 05:08 PM (GMT)
Un vidéo intéressant sur le Jibe
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BossOnline - June 7, 2007 05:15 PM (GMT)
Et un autre:
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BossOnline - January 7, 2008 04:24 PM (GMT)
Quelques bons conseils sur le jibe:
| QUOTE |
| Zen and the (Never Ending) Art of JIBING: -- By Da Zen Meister Barry (published in the Jul. and Aug. '96 newsletters) LOOK OUT !! - It sounds so simple, but it's so easy to forget. Look before you jibe. I usually try to look before I even unhook and then again right before actually jibing. The first look is during the planning phase of a jibe and the second is a kind of protective backup to catch anyone or anything (boats/boards/barges/etc.) that may have been in your blind spot. Make it a habit more important than brushing your teeth. GO FOR THE GUSTOS - Unless you're severely overpowered, try to start a planing jibe in a puff - not a lull. In flat water, speed is your friend when it comes to jibing. Extra speed helps two ways. One - high momentum will help carry you thru a jibe. Two - since you'll be traveling faster than the true windspeed, the sail will automatically de-power as you de-accelerate, which in turn makes it easy to flip the sail. GET SHORT - I'm not going to tell you to bend your legs more. I repeat: I'm not going to tell you about not bending your knees enough. Knee bend gives you a lower center of gravity (for increased stability) and better shock absorption when going over chop. Bend your knees enough so you can almost look under the boom when carving a jibe. Try for 90 degrees of bend. Grab a magazine and look at the pros knees in all the pictures. I've never heard of a person having a problem of too much knee bend. I dare you to try and bend your knees too much. Try and get someone to video a few of your jibes. How much are your knees really bending? SPIN - Don't Hinge. Can you imagine the difference between the way a revolving door spins versus a hinged door? Most people incorrectly let the sail rotate around the mast instead of spinning around the center of effort (or very near). The secret to getting the sail to spin instead of hinging around the mast, is to PULL as well as push. If you just push or let go of the back hand only, the sail will hinge around the mast. Try to pull the mast forward with the old front hand as well as pushing with the back hand to get the sail to spin in your sail releases. Most hinge sail releases result in the mast falling to the outside of the turn which causes the board to round-up and complete the dreadful “J” jibe. BROAD TO BROAD - Most failed jibes end up on a pinch or heading slightly upwind. The jibe should be completed onto a broad reach instead. Go into the jibe on a broad reach and finish on a broad reach. How do you finish the jibe earlier? Go into the jibe with plenty of speed, which will aid an early sail flip. QUIT WAITING - One of the things that keeps people from flipping the sail soon enough, is the obvious tardiness of the sail flip. Why? There is a short period during a jibe when you'll be traveling the same speed downwind as the true windspeed. Here's the scenario: During this short period there is no pull in the sail...which means the sail won't help hold you on the board...Oh my gosh!...I’d better wait a little longer to flip the sail...I’m slowing down now as the the wind catches-up and refills the sail...Now the sail is pulling on my arms again and I can counter-balance against the pull to help keep my balance...but now there's a lot of awkward pull from the clew first sail and Ill just instinctively dig in the tail to counter this...which slows me down more...which puts more pull in the sail...which I counter with more tail dig...which slows me down even more...which makes the pull even harder...until I either fall or finally let go of the sail. How to avoid the “vicious circle of jibe?” Flip/let go the instant the sail has no pressure/pull and is de-powered. This slack time is a blessing. Don't let it pass you up - flip the sail. A good exercise in fast flat water, is to see how soon you can let go of the sail. Most people already know how long they can hold on ... too long!! RELEASE ME - Often, people don't let go of rail pressure soon enough when jibing. The jibe is tentatively initiated with very little rail pressure and progresses to too much rail pressure at the end of the jibe. This often results in what I call a “J” jibe. The jibe starts out straight and planing and ends up slow, slogging and overturned. The most successful jibers press on the rail firmly during the first half of the jibe, when there is a lot of board speed and flatten the board (reduce rail pressure) for the second half. This gets the majority of the carve out of the way while the board has planing speed. The second half of the jibe is more of a coast than a hard carve. KILL THE POWER - In order to successfully plane thru a jibe, you have to de-power the sail somehow. There are two ways to correctly kill the power, or de-power, a sail (sheeting out is not one of them). Outrun the wind - Sounds hard but its not. You're probably doing it now if you're planing. Example: In a twenty MPH breeze, everyone's going 25 MPH. The trick is to carry that speed into a jibe. If you start out traveling 25 MPH on a reach and wind up going 20 MPH half-way thru the jibe (straight downwind in our example 20 mph wind), there will be no wind, and hence no pull, in the sail. As the jibe progresses, your speed will continue to decrease and the pull in the sail will increase as the wind catches-up. You see the problem right? Don't wait to flip that sail. Flip as soon as possible after carving past straight downwind. Otherwise, the pull in the sail will be too much and you'll have to lean back... which kills the speed even faster...which increases the pull... Heard it before, right? Outrunning the wind is the easiest way to learn how to plane thru a jibe on flat water in winds under the mid-twenties. Go into your jibes with mucho speed. Oversheeting is the second way of “de-powering” the sail. Often this technique is used in conjunction with outrunning the wind or by itself. Its the only technique that's going to work in near 30 MPH or greater winds, on confused & choppy waters. Oversheeting is your KEY to highwind jibing. You're never going to be able to lean your sail and body forward and into the turn, unless you learn how to oversheet. Its easier to oversheet when you're traveling close to the speed of the wind. You can start to learn oversheeting even when outrunning the wind. Before you get to the point when there is no wind in the sail (mid-jibe), give the back hand a little tug to oversheet the sail. By starting the oversheet pull progressively sooner in the jibe, you will eventually be able to start the oversheet motion almost as soon as the jibe initiation. This opens up the door to tighter and tighter jibes. Jibing between swell/waves (instead of bouncing over the tops out-of-control) will be in your bag of tricks. Oversheeting is the only way to jibe when there is too much wind to outrun the wind (most bodies of water get choppier with increasing wind and will limit your board speed to near 30 MPH). How to oversheet? See “Cheater Bar” section. You will often have to be patient when oversheeting the sail. When truly powered, it will take a little turning in the jibe to decrease your apparent wind enough to allow the oversheet. Just be patient and commit to the forward and in, lean of the sail and body. After you oversheet the sail, you need to usually let the clew out a little or you may become backwinded. Don't become so focused in oversheeting that you forget the early release and overturn the board (See “Broad to Broad”). CHEATER BAR - If you have a really stubborn bolt or nut to loosen, what do you do? Increase your leverage. Get a cheater bar. If you're having a hard time oversheeting the sail, in order to de-power the sail, what do you do? You use the equivalent of a cheater bar - Move your back hand to the rear of the boom at least 12 inches. Try for 18 inches. The bigger the sail and the more powered-up you are - the bigger the cheater bar (reach farther back with that rear hand). REVERSE OR STEP? - I personally feel that a step-jibe is harder to master than a reverse-foot jibe. Some might think I have this reversed. I'm right and they're wrong. Sure a step-jibe is the jibe to learn for racing, but it requires you to switch your feet during a crucial part of the jibe (the sail flip). It also becomes harder and harder to step-jibe in higher winds. So why not learn a technique that you can use to plane thru a jibe in the broadest range of wind first - the reverse-foot step jibe. After you get the reverse-jibe wired, then learn how to step-jibe like the Robbys and Bjorns. In a reverse-jibe, you flip the sail and then you step. Often these two happen very close together. Almost simultaneously, but the sail flip happens first. This allows you to continue (and feel) the carve with the feet, while you flip the sail. Once the sail has been caught on the new tack and power starts to build-up in the sail, then untwist your legs. Its a good exercise to try and see how long you can sail on the new tack with your feet in the reversed stance. Its even cooler to try and jibe back to the original direction without ever having changed your foot stance. From personal experience, learning to reverse-foot jibe (flip then step) was 50% of learning how to plane thru a jibe in higher winds (25 mph or greater). SHIFT GEARS - Too bad jibing technique for non-planing and planing conditions doesn't shift like an automatic transmission. Remember, in light winds (non-planing) you're actually reverse steering with the feet. Pushing down on a rail helps the board to turn in the opposite direction. This is true in both short and long boards - very obvious with a daggerboard down on a longboard. Most people forget this on a shortboard in non-planing conditions, or when they biff a planing jibe. In non-planing conditions, the dominant turning force is the sail - not the rail. Leaning a sheeted-in sail to the outside of the turn is what most helps turn the board. This is the opposite of a planing jibe, where the sail needs to be leaned into the turn. TOW - One more obvious tip. Time on the Water is better than time on the shore watching. Go get wet !! -- Barry Ritchey Top |
sailpower - January 22, 2008 12:08 AM (GMT)
BossOnline - March 13, 2008 02:16 PM (GMT)
Excellent vidéo sur le site de Guy Cribb . Le vidéo est une promotion pour un DVD, mais il montre des choses intéressantes.
