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Text of the page (random words):
on with the mark ii sail is that it makes an ugly crease in the sail though it isn t really that much slower it just looks bad in heavy wind some people actually try to create this crease to dramatically open the leach crease or no crease the difference between a mk ii a mk i or a mk i intensity sail are smaller than the difference between a new and an old sail on the topic of intensity sails beware of mark ii intensity sails they may be fine and my sample of 1 may just have been a lemon on a bent mast but last year rob douglas up in comox bought a mk ii intensity sail and the crease was very bad in all conditions and we couldn t get rid of it without stretching the sail much more than you wanted to for speed it was so bad that it was discouraging so a used class legal mk ii sail may be the way to go on a budget unless other people know of good mk ii knockoffs having mentioned the carbon top section i might as well throw in my two cents about that too the laser carbon top sections are nice because they never get even a slight permanent bend in them so they mesh nicely with the mark ii sails they are not lighter than the aluminum masts which is hilarious but they wanted it not to be an advantage which makes sense from a laser point of view the only other difference is that hey feel a bit springier which might be an advantage in kinetics or wavy conditions the biggest difference in my opinion is that if it was very windy and then the wind died off people with aluminum sections would all have a slight bend but the carbon ones pop straight as soon as you release the cunningham and vang the biggest downside is that they are super expensive for what they are a simple tube with the same old fittings other downsides they are more delicate because carbon doesn t like impacts though mine has stood up well for a few years now also laser made the carbon top sections exactly the same way as the aluminum ones riveting into them with aluminum rivets in the first generation masts there was only one rivet in the top section bottom cap and sailing put too much stress on that rivet and it has damaged the carbon i tried to epoxy it back in place but it as cracked loose again apparently they now sell carbon top sections with two rivets in the bottom cap and it looks like they may have improved the finish on the carbon at the bottom of the mast so that problem may be fixed but the fact remains that aluminum rivets in carbon might not last as long and stay as tight as they did in the aluminum ones so far years no problem with the rivets in the carbon top section collar we will see so for the carbon section i don t recommend buying one if you are on a budget unless you are heavy for the boat like me i was tired of straightening my aluminum top section after every session in over 13 knots and wondering when it will eventually snap and when i should end to end it now i don t have to worry about the aluminum fatiguing from all the bending and straightening at its critical point if you are a big sailor who bends their mast the carbon section is great it is also worthwhile if you are campaigning and you want every possible advantage like springiness in choppy conditions in this strange new world where the second best most accessible big fleet racing boat in the world has it s olympic status under review opti would be the best laser and radial would be the second best i wanted to give the new equipment a tardy but fair review i m happy with both my new ish sail and new top section and i am planning on bringing my newly legal digital compass into play in the new year i m looking forward to the new rudders coming soon which are supposed to be more balanced but i really want a carbon bottom section because i tend to bend that too in medium and heavy wind but that is just me very few other people seem to suffer from perpetually bent bottom sections happy sailing or dreaming of sailing this winter posted by ian e at 12 43 pm no comments email this blogthis share to x share to facebook share to pinterest saturday march 11 2017 this is more footage from steve mcbride when he was coaching us leading up to 2017 laser midwinters east in clearwater this one is about fore aft mobility for weight placement while surfing waves i really value the knees up weight on your feet technique and this is why moving aft picks the bow out of the water when you have power in the rig also i was finding that shifting my weight aft was helping my turns preventing my bow from catching so much posted by ian e at 11 12 pm no comments email this blogthis share to x share to facebook share to pinterest this footage comes from steve mcbride who coached a bunch of us in clearwater leading up to 2017 laser midwinters east i call this skill pivoting look at the cascade effect as it travels up the fleet the 5th boat from the right pivots up into the wind to try to salvage their hole then the 4th boat does me then the 3rd then the second if you don t know how to do it you lose your lane posted by ian e at 11 04 pm no comments email this blogthis share to x share to facebook share to pinterest tuesday january 24 2017 wind accross current in an instructor clinic last year steve mcbride and i were explaining how current affects the ripples on the water and so we naturally transitioned into the affect of current wind on apparent wind we talked about wind against current and wind with current and started to move on naturally abby asked what happens to the wind and waves if there is cross current since we didn t want to get into trigonometry we parked that question but we never ended up getting back to it so at long last here is my answer although as usual with this blog i got carried away with it wind with current st arting from square one if you are standing still on a moving walkway at the airport inside where there is no true wind you still feel air hitting your face because the moving walkway is pulling you into the still air relative to you there is what we could call walkwa y wind this walkway wind comes in the opposite direction as your motion current can be thought of as a moving walk way or conveyor belt in this post i have called the wind felt due to current current wind and i will try never to use the word current to mean now just moving water in this situation the surface of the moving water only feels a very light three knot breeze and so it is likely to have very small ripples and so it would look lighter in colour like a calm patch when you sail you sail by the apparent wind so this really is a calm patch as far as your sail is concerned and if the whole course has the same constant current it is more than a calm patch it is a calm day in this case the current only really matters at the laylines of the marks and finish and at the starts avoid undershooting the windward mark and try sneaking in on people at the leeward mark because everyone will tend to leave too much room around the leeward mark at the start there is likely to be huge line sag take a transit because you can t sail straight upwind boats on starboard will tend to creep towards the port of the line as they try t o stay up near the line causing pile ups at the pin and openings at the boat end of the line wind against current next let s take the situation wher e the wind and current are going in opposite directions this time the water is being pulled up into the wind so the surface of the water feels extra wind and so it will be choppier as far as the water at the surface is concerned there really are 10 knots of wind so the water will be quite choppy without a reference point the only way that you may be able to distinguish current wind from true wind is that current especially a change in current often makes the water more turbulent which can make the water look particularly jagged and irregular we sometimes call it piranha water because in some cases it almost looks like piranhas are trying to poke up from the surface once you get used to looking at turbulent water you can often recognize current but just because you can t obviously tell that there is turbulence doesn t mean that there is no current if the current extends across the whole course evenly it doesn t affect strategy except once again at the laylines and starts at the windward mark it is a good plan to undershoot the windward layline at the gorge columbia gorge racing association at cascade locks oregon there is strong windward current because it is a large river in races and in training i have undershot the windward layline e xtremely in the three boat length circle but then just i could just go head to wind retain my rights and wait for the 3 kt or so current to pull me up to the mark if tacking would mean having to duck boats this way people can only pass me if they have drastically overshot the mark and can sail past my bow of course it would be faster to anticipate the current properly and hit the layline perfectly but usually everyone overshoots the mark by a lot and the gorge often hosts big regattas when there is strong windward current it is important to brush up on your rule 18 3 there are a lot of places to be gained at the leeward mark the danger is hitting the mark i have sailed almost completely past a mark in light wind with windward current only to have the back windward corner of my transom hit the mark as my boat was pulled sideways upwind at the start line it is important to be cautious in windward current my strategy is to get a good transit and the find a part of the line without much congestion when boats are close to each other they tend to get caught up with each other and get swept way over the line the gorge is my favorite example of windward current there is also sometimes upwind current in victoria and vancouver or west vancouver but it depends on the tide so it is less reliable and often not as strong as the gorge is literally a river flowing upwind while playing around with downspeed pre start maneuvers in windward current people often get excited when they realize that by lifting their dagger boards a certain amount they can get the drag of the wind on their flapping rig to perfectly cancel the upwind thrust of the current however with your rig forward on your boa t and your rudder aft on your boat this strategy will tend to pivot your bow off the wind until you are on a beam reach or below if you are all alone this might be okay but in a crowd it is a problem you are asking to be luffed as soon as you need to avoid someone and most people will be to leeward of you you need to drop your dagger board to maneuver properly and then you get sucked over the line the strategy that i have had more success with is to point straight head to wind and then try to avoid touching my boom and to avoid tacking at the gorge there is usually plenty of wind to push you astern so if you point your boat far enough upwind that your boom and so the drag of your sail flap inside the back corner of your boat and then if you angle your tiller straight or slightly to windward the drag on your sail causes you to drift straight backwards with attached flow on your dagger board and rudder what is more unless you touch your boom or pass head to wind you have right of way over most other boats you are on starboard and it would be hard to luff you since you are already pretty far head to wind if you accidentally tack you are subject to rule 13 and have to go back below close hauled and reset if you touch your boom then you are subject to rule 22 3 a boat moving astern or sideways to windward through the water by backing a sail shall keep clear of one that is not however if you are moving astern due simply to good clean drag of wind on your rig and you have not touched your boom even with your shoulder the jury tells me you retain your rights unfortunately that may be a hard one to explain to the person that you reverse into yes technically they hit you from clear astern while you were minding your own business but you better be able to prove that you didn t back your sail it is probably a good idea to warn them ahead of time watch out clear astern boat i haven t backed my sail the really cool thing about sitting on the line heat to wind moving backwards is that to start going again it is relatively easy you gently push the tiller away from you to reverse onto a t ight reach sheet in and hike it feels weird because the flow on your foils has to switch directions but it powers up quickly and unless someone is to leeward and bow out on you you have a g ood shot at a good acceleration cross current that was qui te a segue but at last we have arrived at the final scenario current flowing across the wind direction the angle of the resulting apparent wind depends on the relative strengths of the wind and the current 4 knots is pretty extreme but imagining it helps you recognize what happens on a smaller scale with less cross current also in spite of my best efforts i found that my 7 knot arrow is too short or my 4 knot arrow is too short but the a pparent wind angle doesn t look too far off 30 degrees this math behind the 8 1 knots comes from the pythagorean theorem based on the triangle drawn above the true wind and the current wind don t have to be perpendicular but if they aren t then you need even more trigonometry the angle calculation that gave us 29 7 degrees comes from the trigonometric function tangent arctangent is the inverse of tangent and it is just used to solve the equation bla bla bla that is math not sailing what does it mean for sailing again let s assume the cross current is constant thorough the course and moving from course right to course left as shown above this often comes up at west vancouver yacht club where the course is set up in deep fast moving water if they can get their marks to hold if the race committee ignores the current when setting the course then in the above cases with our 7 knots of true wind and 4 knots of cross current the course would look quite skewed to the sailors and to anyone else who is not anchored below i have made a slightly less extreme scenario with the apparent wind only skewed fifteen degrees left of the true wind even so a s the diagram shows with the current pushing left you would hardly be able to make the pin a good race committee would realign the start line to take this into account but this is tricky for them because sitting on the anchored race committee boat their wind instruments do not pick up the current wind however if the race committee squared the start line to the apparent wind by factoring in the current wind the current will not only be pushing along the line it will also be pushing up across the line which is dangerous for s tarting over early as we talked about below is a diagram of the course squared to the apparent wind notice the current s angle because you certainly will when you are trying to sit on the start line to d eal with this current direction i recommend taking t...
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