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About Foyle

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    fast boat design, kite sailing, AC design

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  1. Beams alone might provide sufficient 'safety' buoyancy at 75ft scale. So maybe it can work - really only needed at zero speed. And with such a wide craft should not need to lower and raise foils.
  2. Foyle

    Team NZ

    Ports of Auckland is the obvious location 77Ha in the CBD, and piss-poor productivity/profitability ($80million/year from land valued at 3-4billion dollars). Efficiently run ports handle more cargo with a small fraction of that land area so with a bit of investment in more efficient automated container storage and movement tech and some effort to make the notoriously bad port workers a bit more flexible in their practices should free up the space they need pretty easily. There would also be little extra cost in shifting much of the non-Auckland bound cargo to Tauranga for a year or two.
  3. Foyle

    Team NZ

    Yeah, I also suspect that Ashby wants to helm - after all that is where the glory is, and he is definitely worthy of it. He might stick around for a two boat ETNZ program, but I suspect he will get a very attractive helming offer from somewhere - he, Burling, Tuke and ETNZ design team will be near the top of every headhunters list (if AC remains in similar foiling cats). They are all professional sportspeople with finite career spans, and for all the work, risks and sacrifices they make they deserve their chance to make retirement money without being called names for it.
  4. Foyle

    AC36 - The Venue

    If can make boats that can handle 1m waves (which seems like a useful design improvement) then do it off the North shore in the Hauraki like previous AC's. If need smaller waves then down in the more protected waters between Waiheke and Beachlands/Howick. Would be nice if we could have tall hangers/sheds and a class of boat that didn't need to have their rigs taken down every night 25m tall doors wouldn't be that hard to do (and could reduce land footprint of base facilities if they built up multi level rather than low and flat). Another option might be a few barges raised up on piles as temporary 'land' space for the cup. a 100x30m barge only costs a few million and takes a few months to get built, and could potentially be sold on to next venue to speed up cup cycle. A purpose built hanger/base ship that could ferry boats and facilities around the world for ACWS type events would be a great way to manage the show.
  5. after 30 minutes there still appears to be zero availability on torrent you posted, perhaps problem with seed upload?


  6. Foyle

    Race Replays

    Hi Rudder, could you torrent each race from now on individually after each race so as not to give away result. Cheers
  7. Foyle

    Team NZ

    NZ has 8 billionaires and 23 with half a billion or more, $7billion dollar man Graeme Hart could likely finance a challenge ($100million) with about 3months income. Michael Fay and David Richwhite are both still worth nearly 1billion each.
  8. Foyle

    Team NZ

    Turtle avoidance. Hitting something with their light air daggerboards while practising would lose them the cup. It is the greatest risk ETNZ faces.
  9. Foyle

    The winning foils

    My thinking on the ETNZ big kinky foils is that they optimally use the outer angled section for righting moment and lateral force, getting that force close to maximum beam with a net force vector that maximises righting moment. The inner section is just for lowering lift off speed and induced drag reduction, and in use is relatively flat meaning and unloaded at typical sailing speeds meaning that the rudder has little effect on it's lift, whereas the lift of the angled part is strongly influenced by the rudder (helping fine control of ride height). The average depth of the ETNZ board is also significantly greater than for competitors which might help to reduce the wave-making energy loss and surface vortexes created too.
  10. Foyle

    Team NZ

    look at the polars over in the polar thread, ETNZ didn't have that much of a VMG advantage today on one tack, (Oracle's asymmetric boards to blame), but were much better at preserving VMG through the tacks. If Oracle forego the assmmetry they are likely to be a lot more competitive.
  11. Foyle

    Race Replays

    I just wish to fuck Ken would learn how to say something like: "VMG is the component of your speed in the direction the wind is blowing", or (mostly true) "VMG is how fast you are moving towards the next mark" rather than long winded non-explanations about angles etc that don't actually explain it. It is an issue that comes up in every race so figure out a quick explanation and spare us all the waffling.
  12. Foyle

    Team NZ

    Hydraulics might be a bit of a weakness for Oracle, but looking at the 1st reach in race 2 sailing the same course in same wind at well below cavitation speeds (below 30kts) ETNZ was holding 1.5kts of speed advantage. In this range ETNZ were about 5% faster than Oracle. Ultimate reaching speed is a very good indicator of overall propulsive force/total drag (eg around 4 for ETNZ vs 3.8 for Oracle) multiplied by wind speed. That is mostly about lower drag given near identical righting moment, likely due to ETNZ daggerboards and perhaps a small contribution from the lower crew windage. Oracle can't hope to overcome that large a deficit at this late stage, and in these lighter winds it means that ETNZ can always sail at a fraction of a degree smaller apparent wind angle up or downwind at same boatspeed, with big resulting (around 5%) VMG advantage as we have seen. The advantage will diminish as get closer to onset of cavitation (high 30's), where smaller foils become optimal, but Oracle can't hope to overcome that big a performance deficit to win races in the light, and unless there is a lot stronger wind for coming races they will lose the cup.
  13. Foyle

    Oracle Team USA

    [LE to Captain of Musashi] Deploy the turtles!
  14. Foyle

    Oracle Team USA

    More sandbagging fantasists. It's bollocks. No team has been holding back anything significant since the start of the LV. They might have a few minor improvements in fairings, and perhaps slightly revised ideas as to what are most competitive daggerboard configurations compared to competition, (ETNZ has so far chosen upwind speed over reaching) but will be nothing that has a noticeable effect on boat performance - it is only an effort in managing esprit de corps within the team to keep them all pumped up. Like the pointless start of day hull polishing effort that used to be done on IACC boats.