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About JoeW

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    Yachts, dinghies, foiling, design

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  1. That's really interesting, thank you. So I imagine the difference between the end plates in a decksweeper and a winglet is that at the foot we already have a hull, so we are just using what's already there to seal the sail but at the head we have to add material which has weight and drag penalties? So although the aerodynamics of the rig would like a large winglet, the added material means you have to compromise?
  2. @cooperdelbridge I hadn't seen those videos before, thanks! @JulianB I just wondered if you had any additional information about the winglet in this video? I assume its using the end plate effect, is it noticeable?
  3. It's not really selling it... It's all well and good if you know the net is going to be off the stern, but what about the one you run over? I think this is designed for something very specific, and there's a reason that no big manufacturer does it.
  4. I'm currently doing a bit of a project on my Moth, so yes, thinking and writing about it is definitely the next best thing! I think all high performance classes require a decent amount of time working on your boat. The difference to the Moth is that being a development class, you can spend extra time trying to find a gain. I think that there isn't a substitute for spending the time either. Even with something as trivial as your vang set up, there is a range in the fleet from 32:1 to 64:1. How do you work out how much purchase you need? It's just testing and seeing what works. I think you
  5. That's good you have a rudder rake control. It's not ideal to be unable to adjust while foiling but at least you have the adjustment unlike some other foiling boats... For the main foil AOA adjustment, is that just using different holes at the top of the vertical to change the rake? I think it depends whose boat you sail as to how many controls you have! The basics are vang, cunningham, wand length, gearing and bias (ride height). Some boats have extra controls such as canting rigs, adjustable forestays etc but they aren't really needed until you're top half of the fleet. When I was
  6. I'm not volunteering to go and free the rope that gets caught around that prop....
  7. The Exocets are a very well put together boat. I do like the way the Mach 2's can be upgraded from the original 2.0 to the 2.6 though. You can get some older M2's maybe the .3 or .4 variants for cheaper now, so its a more accessible route into the class with a clear development path. The support from the manufacturers is excellent as well. I think that is one of the sacrifices of these boats is in the foils. Certainly the older Moths (Bladerider age) don't coast as well as a modern set of foils, and the compromises to keep the foils less expensive, easier to repair, and a balance between
  8. Frustration is what foiling is all about! Too little wind, too much wind, too wavy, too much tide, bad boat set up, more repairs, new development.... That's certainly the way to do it, get a cheap boat and work your way up. My only concern is whether the UFO teaches the correct techniques, and having not sailed one, I can't pass judgement. Does the UFO have the rudder adjustment? The alternative to all of that is to go and learn at a foiling centre, where you don't have to buy or maintain a boat!
  9. And if the engine is off then the chance of hurting someone is zero. None of the RYA ribs have prop guards. I don't think the RNLI ribs have prop guards. I think the serious issue is the lack of training, rather than trying to put in measures to mitigate risk that aren't really needed. Prop guards by their nature also make the boat harder to manoeuvre and some make the propellor more prone to cavitation, both of these are issues. I just don't see that the benefits outweigh the drawbacks, and that there is another solution: training. The other thing is there is no evidence to p
  10. I completely agree here. However, I think this is an addition to what you want from the boat in terms of performance, cost, weight, ease of transport etc.. If I want to race and foil tack, I would go and buy a Moth - even if there wasn't a fleet where I sail. It's exactly what I did! One thing thats certain, is that with an OD production boat, you are more likely to be able to get the boat set up properly. The Moth is more complex in its systems, which for the beginner is hard to get correct, but allows the boat to be a lot more versatile with an experienced foiler. I think if you can get
  11. I can't see the benefits of the jet drive. They are less intuitive to helm, harder to manoeuvre, harder to free any lines which get caught in it, generally have more maintenance or are more prone to breaking, and you can't go in shallow water with them. Surely if they were better to have on a safety boat then people would be using them? I think you've just proved the point that the issue is the skills of the helmsperson, not the lack of a prop guard. The only way to ensure that nothing gets caught in a prop is to have the engine switched off. https://www.rya.org.uk/knowledge-advice
  12. If you look just before that, they are flat for a couple of seconds before they bear away. I do not think it is the same as Ineos because there is no immediate leeward heel, if you watch the onboard, the boat stays relatively flat through the board up, and only heels excessively when they bear away. I think Terry said the backstay was released as normal, but due to other factors the backstay became an issue and pinned the main in.
  13. You can make anything foil if you get the right weight and enough power. Whether it is any good or worth doing is another matter! I don't know whether there is much of a trickle down effect from these boats. An engineer on ETNZ I spoke to said they are basically using production parts which are already readily available and slightly adapting them as required. There isn't really that much development in terms of the foil systems. I think it is still going to be expensive to get foiling for a while yet. If you want decent foils for a Moth then you're looking at over £3k for a main foil
  14. I definitely think that in manoeuvres like that, the WW board is being used to produce RM. I assume when Ben called for board up, the flight controller went neutral flap and board up, assuming the mainsheet would take over the heel control. It doesn't look like AM were using the WW board for negative lift before their capsize. If you watch the replays, they are stable when the board comes up, using the main to control the heel.
  15. I've just watched the feed again and I agree they were already heeling. It looks like maybe the main didn't go out fast enough? It is interesting to note that they ease the sheet before the traveler which is unusual for controlling heel. I don't think the leeward foil has any extra work to do if the windward foil is producing negative lift. The windward foil producing negative lift is acting as righting moment. It is something that I know has been played with on foiling cats, and the theory all works but its very tricky to do if you don't have proper control over the foil. I think that
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