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17 Whiner

About flutter

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  1. looks like you could chop the back 20' off and it would be a modern 80' cruiser. such a strange look with mast stepped so far forward
  2. So much under the hood of these boats that I would like to understand better.. Wondering if American Magic will bring the boat back to the US and display somehow? Or its forever a secret?
  3. Can imagine how a bit of breeze and swell could dramatically complicate this process! The first opportunity seems like a very brief window but also incredibly lucky break if she can make it work.
  4. you cant get much more indecisive than this - losing ground on both groups! was tending towards going upwind to the left of the high also, what you said earlier made sense as there seemed to be a good chance the breeze would shut down on the right as the high developed... but now maybe the left is looking fickle as well? hard to decide.
  5. Ahh I see well live tuning for sure gets you to the end point faster. Maybe all that metal contraption comes out and a lighter insert goes in to lock it off for the race
  6. I guess the benefit would be that they can retract clear of the water in extreme or really light conditions. Also really control the amount of lift produced by the amount of foil extended so you could have a number of settings This curve is a pretty close approximation of the shape of the new foils on other boats - ie. Apiva - so maybe it's fine in terms of performance? I'm still wondering whether there is a hit to upwind performance due to the loss of that side-force producing up-tip that on other designs gets submerged at greater heel angles. I noticed in the HB video that the top
  7. interesting comment from Michel Desjoyeaux on this: https://www.tipandshaft.com/en/vendee-globe-2020-2021/michel-desjoyeaux-corum-is-probably-the-boat-i-have-invested-the-most-in/ The class will shortly be looking at the next set of rules. Are you in favour of foils on the rudders that some people want? You are preaching to the converted. Once you accept foils, and so fly, to be stable you need three legs. You can have two when you regulate the power all the time, as on the AC75, as there are a lot of people there to turn the handles and regulate the transversal stability. When sa
  8. my guess: the shaft of the foil is curved following the egg-shape cutout. When extended the foil is anchored on that second bulkhead close to the exit point. Potentially there is no top to the case, so that the foils can extend past each other when retracted (although I can't see how this is worth the extra complexity so maybe wrong?). Maybe this geometry moves the submerged area of the foil outboard - potentially gaining more righting moment? And keeps the non-lifting shaft out of the water as much as possible.
  9. Simple, exactly. Guessing that‘s also lighter than an articulated boom inside the sail.
  10. hey Phil, any chance you have a pic of the manta foil?
  11. I came across archives of sailing anarchy, including maybe some bits of the missing threads - https://web.archive.org/ ie: https://web.archive.org/web/20170724205221/http://forums.sailinganarchy.com:80/index.php?/topic/156565-team-nz/&page=209 https://web.archive.org/web/*/http://forums.sailinganarchy.com:80/index.php?/topic/156565-team-nz/* not sure if this is helpful, some links appear to be broken. maybe someone knows how to use this resource properly and can retrieve the info
  12. there's no point considering the hull by its self... there's no point speculating about what will and won't perform best in a wind tunnel from pictures... i guess there's no point saying this either. carry on
  13. probably can't geometrically get to 15 degrees without the hull touching the water. has anyone drawn this out? point of heeling a moth as I understand it is: a. increase righting moment by increasing the horizontal distance between the foil and the ballast (you) b. present the best lifting surface (foil horizontal which is cambered) as close as possible to the combined lift / side force vector. guessing this is maybe as much as 30 degrees but that much heel reduces lift from the rig too much, plus the wingbar gets too close to the chop. so there is a balance that you easily find
  14. That's maybe not the dumbest idea, trade off a bit of drag for more righting moment. Wasn't that the initial intention of the foil concept? is there a max weight for the foil assembly?
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