Wednesday, April 14, 2010

LASERS SAIL UPWIND IN WAVES

I have some other parts of the blog that comment on sailing in waves, but a recent “Speed and Smarts” is about playing the waves, so let me review what I know about Lasers in the waves.




Generally go upwind in the smaller waves and downwind in the bigger waves, if you have a difference on the two sides of the course without a great deal of pressure difference.



If there is current, then the above is reversed. When the current in with the wind, then the waves will be less with more current and bigger where the current is weaker. Current against the wind then makes the waves bigger, so in either case go upwind in the bigger waves and look the smaller ones going down wind. If you are sailing in tidal waters, it helps to know when the tide will change.



Going upwind with the Laser, when the waves are less than 18 inches, you just need to power through them. Bare off a little to be sure you are moving well. Don’t pinch. Tack in a flat spot.



Somewhere between 18 inches and 2 feet you have to begin to think about the old up the “up side and down the down side.” That gets you through the wave faster and gives you a little push going down the down side. When you do this you pump the tiller down (to leeward) to get the bow up and rock you weight back to help lift the bow. Then on the top of the wave, pull the tiller toward you and rock your weight forward to help get the bow down. These moves can be quite vigorous when the waves are steep and short . Robert Scheidt, recent great Laser sailor moved to Stars, could be picked out of a fleet by his radical movement.



Dellenbaugh divides the waves up into 1) Normal wind for waves. 2) More wind than waves. 3) Less wind than waves. 2) happens when the wind is increasing and it gives you more power to trim tighter and sail higher. In 3), you power up and bear off. Don’t pinch. In any of the cases you need to be sure you are moving through the waves and not being stopped. You need to manage them better than you competitors. If not, see if you can tell what they are doing.



Try and stay in clear air, tack in the flat spots, or just before the wave so that the waves pushes you bow around, instead of stopping you. Be careful with close maneuvering as everyone has less control.



You need a clear air lane more with waves.



Not all waves are the same, so you have to keep watching ahead. Some waves can just rise up ahead of you as forces below the surface join. Some will need powering through and some worked up and down. If you are going to stick your bow into one, then let the boat heel and dump as much of the water as you can, so that you don’t get all the water in the cockpit.



If you sail on a small lake and don’t have bigger waves, then you may want to take some long visits to places that have them. It takes practice working alone and then sailing beside someone so you can make some judgement about your technique. Every day will have a little different set of waves, so get out to the race course early and get the rhythm down before the races start.



Dellenbaugh says that usually the waves are the same on both tacks, but occasionaly skewed.

My experience is that they are almost always lopsided with one tack more square into the wind and one more at an angle. Either the waves are changing as they move along the bottom or the wind shifts and the waves have not yet. If you are going square into the wave, bear off more and take it a little on diagonal. The changing angle to the waves will also help you pick up the wind shifts, as the waves will take a long time to change angles.



Motorboat waves should be worked the same. Power through the smaller, up and down the bigger and take them at an angle if coming on square.



Next week we will do the downwind section.

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