SeanPurdy

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About SeanPurdy

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    UK south coast

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  1. SeanPurdy

    Luna Rossa Challenge. AC 36

    Picking up on the feathery theme from upthread, I saw this post on gust response in birds' wings on the brilliant blog Fuck Yeah, Fluid Dynamics: "In flight, birds must adjust quickly to wind gusts or risk crashing. Research shows that the structure of birds’ wings enables them to respond faster than their brains can. The wings essentially act like a suspension system, with the shoulder joint allowing them to lift rapidly in response to vertical gusts. This motion keeps the bird’s head and torso steady, so they can focus on more complex tasks like landing, obstacle avoidance, and prey capture." I have absolutely no idea how you would engineer something like this into an AC75 rig, but it might have helped American Magic in that bearaway.
  2. SeanPurdy

    Vendee Globe 2020

    Four years ago, when Armel le Cleach was in roughly the same spot as Yannick Bestaven is now, six boats had passed Cape Horn. This year the 17th is about to pass that landmark and there are six boats within 200 miles of the leader. This is a truly captivating race!
  3. SeanPurdy

    Vendee Globe 2020

    And to put that into context ...
  4. SeanPurdy

    Vendee Globe 2020

    The counter-intuitive “contrary current gives higher speed over ground” thing does work for high performance boats that might increase their speed by 3 knots for just a 2 knot increase in wind speed. Imagine a foiling boat doing 12 knots downwind with zero current and a ten knot “ground” breeze - and therefore 10 knot TWS. Add 2 knots of contrary current and TWS increases to 12 knots … and boat speed to 13. That 3 knot increase in boat speed exceeds the 2 knot loss from the current so it’s a net gain in SOG. Yes, I know it’s not that simple and you can’t sail dead downwind blah blah blah but the principle is sound. I’ve done it on the Waszp and it works. Not in every situation but in the right conditions the effect is very real. Now back to the Vendee. Go Pip!!
  5. SeanPurdy

    Vendee Globe 2020

    Great work by Pip Hare and Didac Costa to wriggle free of the ridge and into the circulation around the top of Theta. 36 hours ago they were in a group with Miranda Merron and Ari Huusela and now they’ve opened up a 160 mile gap - which is likely to double or more over the next 24 hours.
  6. SeanPurdy

    best new foiler for beginner?

    This made me smile. I’ve yet to experience this “complete control” thing that you mention, although I have seen it done so at least I know it’s theoretically possible!
  7. SeanPurdy

    Best booties for moth

    @guppy2 They're right by my desk (don't ask) and they're Zhik 260 - so RobbieB I think the 460 is the lightweight version.
  8. SeanPurdy

    Best booties for moth

    I have a pair of Zhik skiff boots that I use on the Waszp. Good support for foot and ankle (which I need as I have catastrophically flat feet) and excellent grip. Not cheap and I've not had them long so can't yet vouch for durability.
  9. When we got ours she was 20+ years old and the non-skid had peeled, cracked and gone at many corners. It still provided good grip but looked terrible and really held onto dirt. We stripped it all (which was fun) and painted with Kiwigrip - very happy with the result. Love the idea of your spline weights changing the trim of the boat. What were they made of, spent uranium?!
  10. I've owned a Valiant Esprit for 15 years and have never sailed a Crealock, so you should adjust for bias. But ... The Nordic-built boats (as mine is) are blister-free, but I believe some of the Uniflyte boats had blister issues from the resin they used. Should be easy to confirm - post to the Valiant Owners forum on Yahoo and you'll find someone who can probably give you history on the specific boat you're looking at. Our water tanks are the original aluminium from 1979 and still keep the water in fine. Won't last forever but I'm not planning to replace unless we have to. We replaced the fuel tank three years ago with a plastic one, only partly because of its age. (It was full of sludge and cleaning it was going to be costly, we had the engine out anyway for another reason, so it seemed a timely precaution.) My wife and I took ours across the Atlantic and back (UK-Carib-UK) and she behaved impeccably (the boat, not the wife). We had a few gear issues, partly because we set off only a few months after buying her, but the boat performed beautifully. I was (still am) particularly impressed with her light airs performance, even when laden with liveaboard gear. And I have total confidence any time it gets lumpy. She's sea-kindly and very solidly built. Living aboard two-up for over a year was no hardship. She has a huge saloon for a boat of that size and era, and the galley is excellent (we like to cook). She's also easy to handle with two and I'm sure would be easily single-handed with the right gear. We found three to be the optimum for ocean passages - best trade-off between man-power and domestic comfort. I imagine your choice between Esprit and Crealock will be as much about the state of the specific boats as it is about their differences in design. But FWIW I'd happily cross the Pacific in any Valiant Esprit that I knew was in good order.
  11. SeanPurdy

    trickle down

    But a simulator - now that would accelerate the learning!
  12. SeanPurdy

    trickle down

    I am a foiling beginner (I have been for a while now) and my experience with the waszp is that better flap control would not make learning any easier. The effects of sheeting, steering and body movement are simply orders of magnitude greater than the wand/flap component of the control system. To echo a point that was made up-thread, the reason it’s hard to learn to sail these boats is because you need to coordinate body, sheet hand and tiller hand constantly to keep everything in equilibrium. And you need to anticipate what’s about to change, because if you just react to it you’re already too late. The control system is important, of course. But if your technique is right you can still get a poorly set-up boat to foil, whereas poor technique will stop you foiling even if Paul Goodison lent you his moth. I could describe dozens of different ways that I’ve lost control of the boat, but I'm pretty sure none of them were down to the slow response of the main foil flap. For the beginner I could see a very small advantage to a high tech flap control system if it automatically set the ride height, so you didn’t have to fiddle with another bit of string while you tried to avoid crashing. But you’ll still have to learn the dexterity to do that, because the downhaul and outhaul won’t adjust themselves (not to mention all the other controls on a less simplified moth). I can’t speak for potential performance gains for expert sailors (ask me again in ten years or so) but I really don't think that replacing the wand and mechanical linkage with sensors and computer processors would make the learning process any easier.