Phil S

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  1. Phil S

    Moth Developement

    Bill Beaver's work was for a low rider when the Hungy Tiger was state of the art. An aweful lot has changed since that time. Smaller hulls out of the water, double the speeds. I doubt anything in that paper is relevant any more.
  2. Phil S

    what is it?

    cabon fireball?
  3. Phil S

    A-Cat Style Rig on foiling Moth

    No arguments with what Simon has said. Perhaps the big difference in the way the rigs for each class have developped and the way they are used is because of the big difference in mast height. The moth has a mast height and luff length limit while the ACat does not, so the A has always used much higher aspect rigs. This could also be why the A sailors are more interested in lowering the centre of effort as gust response than the moths have been, although the new trend to shorter deck sweeping rigs in both classes does reflect this strategy.
  4. Phil S

    A-Cat Style Rig on foiling Moth

    No, the wing mast will not rotate freely. The reason is it bends more easilly across than along the major axis. So when rotated it bends back and to windward at the top, and forward and to leeward below the hounds. This is one of the reasons its efficient, good at holding up the sagging leach. When it bends like that its really hard to reverse the bend under leach loads when you tack or gybe, even if there are no boom or vang loads applied diretly to the mast. Its not about where the boom is pushing but about where the head of the sail is pulling. Try bending a flat piece of wood and then try and rotate it and reverse the bend under load.
  5. Phil S

    A-Cat Style Rig on foiling Moth

    Cunningham controls mast bend. First tension bends mast evenly and flattens sail generally. Last few kg bends top of mast a little extra and loosens top of leach for over powered conditions. Vang keeps leach tight, even with extreme cunningham loosening upper leach, vang holds lower and middle leach tight for upwind ability. Matching mast bend to luff curve is critical. Front spreader/prodder is used to fine tune the bend to suit crew weight, as well as length and rake of shroud spreaders. The mainsheet moves the sail in and out like a swinging door, without changing sail shape. The sheet never stops, the sail is always moving. ACat style sailing moves the sheet much less and when the sheet is eased the sail changes shape, more depth and more twist. May work on an ACat but not on a moth, More depth and the boat will just blow over. The biggest issue with a mast which rotates independant of the boom is managing vang loads and still getting the mast to rotate during tacks and gybes. Those who have tried have had extra lines to pull the mast around but loads are high and tacking moths is so hard anyway, the extra step is usually impractical. Two handed boats like NS14 and Tasar have the crew rotate the mast manually, difficicult in a singlehander.
  6. Phil S

    A-Cat Style Rig on foiling Moth

    Most moths no longer have adjustable outhaul. Too hard to move with extreme vang loads. Mast bend is more effective.
  7. Phil S

    A-Cat Style Rig on foiling Moth

    The moth needs a two phase rig. Moderatley deep and powerful to get onto the foils and to go downwind in light weather and a very flat sail with extreme tight leach in moderate to fresh weather. You need to be able to change phases in seconds with one hand as sonm as you start foiling and as soon as you round a mark. Many people have tried different concepts over the years and everyone keeps going back to the pocket luff/ cam rig. And in recent years softer masts and more luff round has become fashionable. These require extreme cunningham loads to bend the mast for the fast flat phase, and extreme vang loads to keep the leach tight. The vang and the cunning are the gear changers and need to be instanly adjustable. All this on a very unstable platform which requires constant mainsheet adjustment just to remain upright with the optimal windward heal angle. ACat style rig without vang has been tried and failed, not responsive enough to mainsheet for heal control. Wishbone rigs have been tried and are found to be not adjustable enough through the phases. By all means try a bolt rope sail and mast, but consider making it do everything like the pocket luff sails do, its proven to be quite successful.
  8. Phil S

    Hervey Bay A Class Worlds

    Moths stop if its over 25kts for over 30 seconds continuous. That can be a lot of wind. We often sail in bigger gusts. We would have raced in the winds shown in the chart for yesterday. Its rough water which is the killer not big winds. But moths survive swimming much better than ACats so damage is not as big an issue. Bruises can be impressive.
  9. Phil S

    Hervey Bay A Class Worlds

    Apparently too windy today: Image from IACAA FB page, Would be a nice breeze in most classes. Would be interested in opinion of class gurus as to wether this low limit is still needed?
  10. Phil S

    Hervey Bay A Class Worlds

    And Erwan, I doubt Glen purchased (buy) the windward mark but more likely he sailed past (by) it. In moths noisy foils usually means a slight twist, scratches or miss alignment. It takes maybe knots off top speed. We are very careful of foil finish. I can not see how the A guys maintain a good finish when you are pulling foils up through cases, especially with sand around.
  11. Phil S

    Future Olympic lightweight-female dinghy

    Mozzy, I dispute some of your arguments. In classes which were big before olympic selection, and there are only a few left, their worlds has always been a bigger, higher status regatta, because they have many more top sailors from all the top countries and fleets of hundreds not just the 20-25 with one boat from each country at the games. Asks a 470, Laser, Finn or Star sailor. In most of the modern Games classes this is not the case as only the Olympic factory sailors sail these boats. Most of these classes were created for the games and would not exists without it. Increasingly they represent types which are not sailed anywhere else. Mixed gender two handed one design ocean racing keelboat is the prime example. Olympic feeder classes are popular with some kids and aspirational parents. Most of these kids give up the sport when they get to about 18, saturated with coaching and looking for a real life. The NAs like to have a big field to select their next elete from so do not care about the detritis leaving. Our NA has also killed of a lot of old popular junior classes by supporting only their few nominated classes. There are not really more kids sailing than before, just more coaches and more hype. Sailing is an elete sport for wealthy people from wealthy countries. Thats probably why it got selected for the Olympics 130 years ago, the elete were creating the event and wanted something for themselves, their royalty and the ruling classes. Even though AS and IOC are pushing for smaller and simper boats than before its still an expensive sport when you add coaches, their boats, and international transport. Trying to push our sport into poor countries and communities is really a waste of their resources.
  12. Phil S

    Future Olympic lightweight-female dinghy

    The Olympics is a money making TV business for admistrators, coaches and a much smaller number of athletes, no more than a few hundred athletes in each of all but a small number of countries. Its a money cow for the IOC and the various sporting associations including World Sailing. Its success depends on TV revenue for two weeks every 4 years, its got nothing to do with sport development. Increasingly the sports on display are just TV shows and have little relevance to the sports played by ordinary people, and thats been the case to a great extent in sailing all my life and the latest decisions have made no difference to that. So who really cares?
  13. Phil S

    C-Class Little Cup news

    Skeeta has one main foil on the centreline like other moths. Well established and well developped configutaion. If the foils and rig are good enough only the extra windage and weight of the scow hull are the negative.
  14. Phil S

    C-Class Little Cup news

    From a completely remote point of view, my thoughts are that Rocker failed upwind becaue it could not rely on sufficient windward heal to unload the verticals from lateral resistance duty. Moths then healed about 15deg but now more like 20deg. At this angle the windward component lf lift from the horizontal foil more than covers the lateral resistance loads and the boats actually climb to leeward, ie reverse leeway. It is very noticable how the boat slows when heal is reduced for manoevres. The newer cat foils do this by having the hoizontal L or Z foils fitted at an angle to the horizontal about the same 20degs. The other disadvantage is that the windward foils even if geared off are still providing a lot of drag for no real benefit. This still happens with most cats, even those which pull the windward foil up, but leave the windward rudder down. The scow foiler in the above photo was David French at the Perth 2016 nationals. The boat was reasonable downwind but hopeless upwind. I am on the boat with the yellow tramps on the second lap catching the scow which is on its first lap and I am deep in the mid fleet. I expect the Skeeta will perform more like a state of the art moth than the trifoiler.