P Flados

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About P Flados

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  1. P Flados

    Steve and Dave Clarks Unidentified Foiling Object

    Okay, I might as well admit it now. Becoming competent with the UFO has been more of a challenge than I expected. Way too much of my time has been fighting bad sailing locations and/or bad conditions. Bad sailing locations have contributed to a lot of damage requiring lots of repair efforts. However, even with good conditions, my progress has been slow. The physical demands of learning to foil this thing are also pushing this old man uncomfortably close to his limits (especially as I sail solo). That and my "limits" seem to be rapidly getting worse these days. I do plan to continue to work on my UFO sailing, but I am restarting my small tri test platform effort. I will use a mix of old parts and UFO parts to try to assemble a boat that foils, requires less water depth, involves less swimming and dunkings and is generally easier on this old man. Control lines will be used to lower / raise each of the 2 main foils. It will probably be slower "around the cans", but racing is not part of my needs. The boat will require swapping the "down foil" at tacks (similar to an AC 75 but a whole lot slower). The re-build part of the effort will be a good winter project. I have started posting again at my old boat design net thread if anyone is interested in this effort. https://www.boatdesign.net/threads/small-tri-test-platform.51551/page-5#post-890892
  2. P Flados

    Emirates Team New Zealand.

    The Harbormaster only said no for the prelims. The Harbormaster probably felt these were not important enough to be worth his effort. Having apparently dismissed the prelims as not important was something that ETNZ should have pushed back on hard when it first came up. Letting this all blow up at this point is a mess. ETNZ really needs to step up and get it all settled quickly so that teams can do appropriate training at the right locations.
  3. P Flados

    Emirates Team New Zealand.

    Polite request for something that has dragged on enough.
  4. P Flados

    Team NYYC

    I noted that. It is obvious that they forgot to recruit enough super strong and high endurance grinders that happen to be very short. More seriously, it would appear that all of the deign teams spent a lot of time factoring in the aero for crew layout. Patriot does have them arranged in a straight line and packed together pretty close there in the back. That great shot of the first day oops shows off what seems to be a pretty good overall crew / deck layout.
  5. P Flados

    Luna Rossa Challenge. AC 36

    "that tend to mask the attempt to gain an unfair advantage over the Challengers who, we repeat, unanimously supported COR 36 by each lodging their own independent submission." LR and both other challengers were involved. Anything that could be viewed as ETNZ attack on LR does look like bad behavior at this point. I understand that ETNZ was potentially just trying to manipulate local government involvement to get all courses allowed for all racing. If so, can anyone explain the poking at LR?
  6. P Flados

    Emirates Team New Zealand.

    Horn Rock & Mako, There is AC action available to discuss right now. If you want to discuss fighting the Japs, making a new thread is easy. I will even throw in a please for all it is worth.
  7. P Flados

    Team NYYC

    My eyes are not "CFD calibrated", but to me Patriot looks to have the main sealed off to the deck very nicely and generally good airfow on the aft half of the boat.
  8. P Flados

    Team NYYC

    The short vertical connecting section above the 3 way junction / bulb is what I would call an extension of the arm. This is the "part of the arm" that acts most like a dagger board on a typical boat. It obviously provides significant lateral lift except when very little of it is in the water (much of the foil out of the water on the Y foil boats).
  9. P Flados

    Emirates Team New Zealand.

    And how many hours over the past 2 cup cycles has ETNZ sailed the waters in question (just a question, not a jab)? Having ETNZ not use those courses for a limited period of time at this point might "look good" but it could be considered a half measure. This is one of those "change in protocol" type of things that the COR has every right to push back on if it gives ETNZ any advantage that they did not lock in when they issued the protocol. It would be great for the ETNZ fans, if the unintended consequences of the Harbor Master (no racing on B & C at all) would provide sufficient leverage to be used by the right people to get everything back to what was originally planned (All courses available for all races).
  10. P Flados

    Team NYYC

    To align the boat to travel at an angle off of hull centerline, they do not need to mess with the arms They can leave the arms at a right angle to the boat centerline and just shape the lower fairings on the arms and angle the foils to "point" any direction they want (at a small angle to the hull). Having the foils not line up with the hull can help or hurt when lowriding depending on hull shape, the angle between the two and whether your foils "toe in" or toe out". Upwind VMG is where areo drag of the hull is a really big deal. Sailrocket 2 had the main foil at a big angle to the hull centerline. Their goal was to have the hull line up with the apparent wind direction while at speed to reduce hull areo drag. For the AC75, having the hull say 1/2 way between direction of travel and apparent wind, could allow the hull to act more like an extension of the sail and provide some forward driving force at reduced areo drag over "lined up with direction of travel". Downwind sailing for these boats is with apparent wind far enough forward that what works for upwind should be Ok for downwind event though apparent wind speeds are so much lower. Then there is the 3rd case to be considered: brief hull contact (splashing) that we see, usually just after a turn. Given how far the teams are willing to go searching for small advantages, I am sure they ran all kinds of angles through the simulators. If you are betting on a dry race with minimal splashing, then optimizing for best areo would seem to make sense. If you are betting on more than minimal splashing then you may be looking at a compromise. If you are worried that boats will be coming off of foiling while racing, then prospect of a compromise for all three may make sense.
  11. P Flados

    Boats and foils comparison

    There was discussion of a hydraulic problem I think. You know like maybe the hydraulics lost oil, rudder rake went wrong and...
  12. P Flados

    INEOS Team GB

    The more Y the better for high speed drag at the junction. The kink lets you get a big angle for drag savings at the junction without having the tips going out of the box at the lower corners. The price is probably some complexity on making a flap work across the kink.
  13. P Flados

    INEOS Team GB

    The bump is at the location of the arm and is probably a mix of making room for arm actuator and what worked best for low drag in CFD. I was shocked the first time I read about how low drag a box keel could be. I think it was a rowboat, but they had test data to back up their claims. I seem to remember the discussion including something like "at close to design speed it would require a much longer hull in a standard profile to get down to the drag that was measured, however at other speeds performance was not as good". For some pre-foiling speeds and conditions, it is likely that this thing could be a big improvement. At the moment I am just not sure that those conditions will matter. I wonder most about how it will do when it comes to the drag of a splash (more than a kiss, less than a transition to sub foiling) coming out of a low wind turn. CFD results should be pretty good for steady state, but a dynamic analysis gets to be a tad more involved.
  14. P Flados

    Steve and Dave Clarks Unidentified Foiling Object

    The video shows off some good foiling there. And a quick trip to the hardware store will find SS bolts and pins. I assume it was just a loan from the wagon.
  15. P Flados

    Boats and foils comparison

    Enig, I am not sure any of these boats could maintain the speed needed over the required distance with existing foils. However, my guess is that they might get pretty close. As discussed in the cavitation thread, the next round could be much faster. A little rule tweak, new courses and away they would go. And yes, the speeds these boats are doing are quite remarkable.