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      Abbreviated rules   07/28/2017

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About RobG

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  1. Crossbow fl 2017

    No. Doug was all into T foils with flaps until the AC boats showed that J foils worked. He added all sorts of features to his foils: iFlap, "wash–in", etc. that have not only not been adopted, but developments have gone the other way. Some of his designs adopted features of Hugh Welbourn's Quant foils (which he acknowledged, so that's not a criticism). But I've probably said enough already to turn this into yet another thread full of the same claims, images and multi–colured text as all Doug's other threads. BTW, Doug has been posting about his "Crossbow fl" for over 5 years over on BoatDesign.net. Maybe it's a fantastic design that will revolutionize sailing, just like SpeedDream was supposed to. So far results have been roughly equivalent. Criticism of Doug stems mostly from his hyperbolic, unsubstantiated claims accompanied by posting and re–posting of the same material over and over again, across any thread that is remotely concerned with hydrofoils. Watch this space… If Doug had any brains, he'd start a blog or web site so instead of publishing his stuff across multiple threads over multiple sites running for 8 or 9 years with many thousands of posts (and reposts of reposts of reposts ad infinitum), he could just keep current information on a couple of pages. Anyway, I think I'm about to get the red letter treatment (or whatever the quoting colour of the day is).
  2. Did SpeedDream look pretty? Was it fast? That philosophy might need some fine tuning…
  3. The original quote was that "… this technology will be easier to transpose on everyone's boat than it was for AC50s." To support that, they don't need an entire AC75, just to fix some articulated foils to their J 105s or TP52 or whatever. I expect that should be in the realm of a few hundred thousand, not millions. PS if 1/3 of the members at your (sailing?) club bar are able to scrape together $150m for anything, you're at a much more affluent club than I am!
  4. There are plenty of people and organisations with the money, more likely is they don't see any kind of ROI supporting an elitist white male sport.
  5. I think it's a lot more complicated than that. Yes, sensors are relatively cheap but processing the input to know what adjustment to make isn't. A foiling boat has movement in 3D, and accelerometers drift, so there also needs to be a system to provide a datum, or maybe ventilation is it. I expect that in an ocean setting at 30 kn, working out which waves you can drive over or through and those you need avoid has to happen before they reach the boat, and certainly before any reactive system can act.
  6. Radio Control Multihulls

    How were the wind and boat speeds measured? I haven't seen any video of the Fire Arrow foiling that was remotely "steady", much less 12 seconds of it. If you spent some time learning to sail the boat and adjusted the sails to something remotely resembling trimmed, you might have achieved it. But there's no evidence that you've done that. Please don't try your usual "I don't need to sail it any more because it worked perfectly", you do because it didn't. Where is the "large powerboat wake"? Or is there no video of that?
  7. What system would it use to determine adjustments? Simply sensing the surface at one or two locations (e.g. simple active sensor such as a wand, laser, etc.) is insufficient. Scanning might work, but that needs hugely more computing power and sophistication. It would also need to accommodate the central foil breaching, which seems to be fairly frequent (or maybe they just showed that bit for the JLAT* factor). Maybe a set of accelerometers with some pretty sophisticated analysis tools (AI?) could determine settings from the feel of the boat. Now that would be cool. * Jesus, look at that!
  8. Hence the reason for a separate series. It's already done in just about every other sport: tennis, cycling, golf, sqaush, rowing, soccer, even rugby and cricket. Eventually sailing will catch up, why does it need to take a few generations longer than other sports?
  9. Aft mainsheet

    All the Vagabonds I've seen have a swing-up centreboard, not a daggerboard. Sitting on the case isn't an issue. Forgetting which line pulls the board up and which puts it down is. ;-) If you want to sheet off the end of the boom, just remove the block in the middle of the boom in the sketch. It would be best to have the sheet starting at a becket on the bridle, then to the boom and back to a pulley on the bridle (i.e. swap the blocks in Cynical sailor's photo and remove the one in the middle of the boom). That way when the boom is fully out (e.g. going dead down wind) the tail of the sheet is in the middle of the transom, not out at the end of the boom. The tiller goes under the bridle.
  10. Aft mainsheet

    Vagabond vangs are totally shit, maybe 3 or 4:1, you need to crank on the mainsheet fully to get them anywhere near "on". A decent heave at 32:1 would either crush the gooseneck or bend the boom. Leaving the mainsheet off the end of the boom also means only the helm can use it, otherwise it presents a trip/choking hazard in tacks and gybes. Maybe not an issue on a trailer sailer, but not ergonomically optimal on a 14' dinghy. Anyhow, I'm sure the OP can work it out.
  11. If the foils are properly articulated, they boats can just walk up the beach like their lizard facsimiles.
  12. Aft mainsheet

    You should just copy a skiff system. Use a bridle (maybe adjustable) across the transom, probably fix a pulley in the middle. 2:1 purchase should be sufficient. Sheet goes boom to bridle, back to boom, then along to another pulley about where the current main sheet is. To lessen the overall length of the sheet, you might want to hang the bridle pulley off the bridle using a tether so it's close to the boo m when sheeted fully on. It will reduce the overall length of the sheet by twice the length of the tether. Very easily converted to 3:1 if you need to, but probably not. I think the main sheet on a Vag is only 3.:1 (but I haven't sailed one in quite some time…). You'll need a film tube on the boom as a conduit to contain the sheet running underneath, otherwise you'll garrote yourself when gybing occasionally. You should be able to mock it up pretty easily to get things in the right place before making it more permanent. One issue is that when capsized, the sheet tail will be on boom rather than in the middle of the boat, making it harder to reach initially. But that may not be an issue.
  13. Actually flying on two from time to time…
  14. Seriously? Will it be common in a few years for monos to have articulated foils that extend their beam by 3 fold, with all the mechanical, hydraulic and electrical paraphernalia that entails? I can't wait to see if this concept works and what the resulting racing will be like, but I just can't see it being adopted by anyone outside the AC. Especially when there is no failsafe: if the foil raising or lock-down mechanisms fails (supposing it has one), the boat will capsize. That might be tolerable on a high performance racing boat sailed by the world's best with large onshore crews and tenders in close support, but for weekend warriors scraping to get a crew together, probably not.
  15. Lift will be controlled by a flap, quite likely it can develop downforce. If everything fails to the extent that flap control is also lost, hopefully the failsafe is to remove all control so it just goes "flaps up", significantly reducing (perhaps virtually eliminating) lift. Not fun dropping off foils at 30 kn with zero control. In any case, if the foil arm is free wheeling, it won't offer any RM until it reaches the limit of its travel. Maybe it needs a Saturn V escape rocket on the top of the mast. When it all goes to shit, all the chainplates explode and a rocket deploys from the top of the mast, lifting the rig clear and gently depositing it in the rigging area.