Over Time There Has Been a Problem with the Supply Of
Total Page：16
File Type：pdf, Size：1020Kb
Forestay: Over time there has been a problem daggerboard to present its designed profile to with the supply of forestays made to the correct the water and not a tilted profile that will induce length. Ovington Boats can now supply a fixed drag. length forestay that will clip straight onto the With the rudder blade watch for cracks in the bow ring and when the correct tensions and head and do not use too much force when not pre-pend are applied and should give a rig rake fully down as this loads up the stock and head. of 7150 mm. +/- 5 mm. This has been the Keep an eye on the stock assembly and nylon preferred setting of most boats in the past and bushes to avoid slop. This will, if you allow it to should be a good bench mark for those wishing get worse when wear occurs, disturb the flow to jump in the boat and go racing without all the over the foil and may result in a broken blade or hassle. Some boats have recently been raking as capsize. Neither are fast and both preventable far upright as 7164 - 7169 mm. Though slightly with the correct maintenance. more powerful will encourage the boat to nosedive so unless you are looking for the last Wings: As mentioned earlier in the article, the margin of speed would not encourage the less forward wing tubes have been upgraded within experienced to go down this route as it can the Class Rules allowance. New wings to date prove a very wet experience. have not broken during normal sailing usage. Further addressing the issue of rigid wings the Cockpit Grip: Most boats will need re-gripping class is moving forward with welded wings, each year. There are now several really good which should improve the life of the component. re-gripping products on the market, thanks to The first set have yet to be tried out, but sets the windsurfing industry. We tend to use a two should be available by the time this article is pack system which is as easy as painting the wall published. The first new boat to be supplied with of a house and should last all season. The kit them will be 768. comes with all you need other than the cleaning If leaving your boat standing around and not agent prior to application (liquid Flash will do). being used for long periods of time, it is The other popular method is Sex Wax, not important to wash both the outer and inner favoured by us due to the unsightly mess in the parts of the wing so as to reduce Galvanic cockpit but I am told that it is equally as good in corrosion. Failure to do this may result in a warm conditions. broken wing in years to come. Delamination: This is a problem with many Rigging: Do not overstress the rig or you may boats not just B14s. It does not need to result in bend the mast or damage the hull. See the the end of the competitive life of the boat. The article on "Tuning Advice". foredeck is probably the most common area for this to occur. Boats built post No. 700 have extra Inner Pole: Check the block at the end of the deck supports to reduce the problem. Boats inner pole ((alloy tube) non Ovington boats) on built prior to this number may have already a regular basis as it tends to get abused on a been upgraded. Those that have not been regular basis. If any wear is showing change it or upgraded should leave the work to a person you will regret it when you swim during a race. experienced in laminating in confined areas. Access is gained through the forward hatch Conclusion: I have sailed the B14 for 3 years covers. It is recommended that you go to now and broken some parts when sailing. Some someone who has previously carried out this have turned out to be fatigue and some due to operation. Cost is approximately £300 and adds bad luck or capsizing. As a class we have up to 0.5 kg. to the boat's weight. Other areas rectified the areas that needed sorting and the result in minimal adding of weight. Once boat is now almost bullet proof with very little delamination starts, it is important to address weight added. the situation or it will only get worse and result The one thing I have learned, is that for the in a more costly repair. money spent you will find it hard to get more of Foils: As they say, out of sight out of mind. It is so a thrill in all wind conditions. One moment will important to maintain the foils in the best state remain with me forever, going flat out down that you can. If repairing, do not use plastic Lake Garda in the lead, executing a flat gybe in padding, only use epoxy as this will hold shape 30 knot winds then cart wheeling backwards 400 and the other flexes. You can fit the m. later. I think we found the boat’s limit that daggerboard to the case by using resin and day. We righted her and carried on, what a day. Glynol Silica but must not change the hull's outer skin profile. This will help the 13 TUNING TIPS windward heel to keep the helm neutral. This is where the art of the infamous numbers come in to play and the learning curve for speed as well By Mark Barnes as boat handling starts. In this article I will try to explain and guide both We have sailed with a range of mast rakes established members and those of you looking ranging from 7050 mm. to 7170 mm. keeping the at joining the B14 fleet, giving a set of options to same pre-bend profile. This may not sound a lot hopefully get you nearer the front hotshots on but it can drastically alter the way the boat the water. Obviously the more people who handles and the power the rig generates. follow some of this information, the more Several of the top boats including Dave Hayes compact the middle order to back of fleet may and Sean Dyer do not alter their forestay become. measurement and just learn to control the At the end of the article you will find a table of power and the downhill unpredictability as the average settings that the top five boats have let bow clips the waves. They and several others slip over the couple of years. have mastered this aspect but many of the fleet tend to get wet following this route. The most MAST RAKE: Mast rake, as many of us know, can upright that any of the fleet have recently been control the amount of power the rig generates sailing with is 7170 mm. (apologies if I am and can move the centre of effort (COE) fore and wrong). aft which in turn may change the trim of the boat if all other things are equal. Until the Nationals we had not capsized in anger for 18 months and this was not through boat If you rake the mast upright you will increase handling alone but also due to the fact that we the power and more righting moment will be were prepared to move the COE fore and aft. required to keep the boat upright and moving Alas we ran over the kite on a hoist in Nationals forward. This will also move the COE forward and and blemished our record. push the bow down and lift the stern, which is Note: When you rake the rig you drastically alter what you wish to do in light airs but will induce the jib sheeting and tack leverage angles, so be drag in medium to strong winds. If you move the aware of this when making changes. mast tip aft the opposite will occur, less righting moment will be required, the bow will start to JIB SETTINGS: This is so important when trying to lift and the stern to sink. To counteract this, in get the best out of the rig. Upwind the important upwards of 15 knots, the hull should generate lift thing is to get even camber throughout both the at the stern and move past the speed bump jib and mainsail so as to avoid laminar required to lift the stern and so reduce drag. We separation due to the slot being too open or have been trying to replicate the success that I choked. Don’t be frightened to turn up at an had in the Merlin Rocket for several years that I event with many sets of tell tales on your sails. will explain. On the mainsail run a set from top to bottom about 33% from the luff. Some may pull your leg On the Merlin Rocket we would use anything but it is the fastest way to learn what is from 6 in. of aft rake in light airs to 48 in. The happening to the laminar flow over the sails. extreme rake would be used on very flat water When you outpoint them and foot faster in 30 knots plus or big seas and big winds of 25 through the water, they won’t be laughing so knots plus. Downwind we would use a range much. Next time on a plane look at the vortex from 2 in. forward rake to 28 in aft rake but in coming off the back of the wing and try to think extreme conditions we just left it in the upwind of the wing section as a sail.