Stingray~ 1,405 #10801 Posted December 8, 2020 This could be good: The Yacht Racing Podcast: America’s Cup Special Part 2 – Paul Goodison https://yachtracing.life/the-yacht-racing-podcast-americas-cup-special-part-2-paul-goodison/?fbclid=IwAR3ZmHLXRNz3Pq485FHJoAvPc6FlTHV6lJQcFAjdNJNgCKanIe0UHOFP7VM 1 Share this post Link to post Share on other sites
Stingray~ 1,405 #10802 Posted December 8, 2020 40 minutes ago, Stingray~ said: This could be good: Highly recommend it 1 Share this post Link to post Share on other sites
Stingray~ 1,405 #10803 Posted December 8, 2020 1 hour ago, Stingray~ said: The Yacht Racing Podcast: America’s Cup Special Part 1 – Anderson Reggio https://yachtracing.life/the-yacht-racing-podcast-americas-cup-special-part-1-anderson-reggio/?fbclid=IwAR0cR2wxTs8Ax7aivgvkslts4aQSbVcKHvugCWdZSL13BO6pPGNROzg2hx4 Surprisingly good too. Includes the decision-making process for the day’s sail and a comment that off 350 sensors they are pulling ‘a couple thousand’ database columns from off of them. 1 Share this post Link to post Share on other sites
kenergy 562 #10804 Posted December 9, 2020 8 hours ago, Stingray~ said: Surprisingly good too. Includes the decision-making process for the day’s sail and a comment that off 350 sensors they are pulling ‘a couple thousand’ database columns from off of them. I use a device at work with 6 sensors that generates close to 400 columns of data. It doesn't take long until you have GBs to deal with and it is very straightforward situations that its used in. I cant imagine something as dynamic as these boats. Share this post Link to post Share on other sites
Stingray~ 1,405 #10805 Posted December 9, 2020 17 hours ago, kenergy said: I use a device at work with 6 sensors that generates close to 400 columns of data. It doesn't take long until you have GBs to deal with and it is very straightforward situations that its used in. I cant imagine something as dynamic as these boats. Yep, that much data must confuse the questions you should be focusing on? Amazing, some of the AC75 sensor descriptions, though. Even on just a pedestal they measure turn rates, turn accelerations, frictions across the various systems being cranked, and of course sync timing. Share this post Link to post Share on other sites
cinnr 19 #10807 Posted December 10, 2020 Anyone have insight into why it takes multiple days to change foils (as Anderson Reggio said in the above podcast)? Seems like it will limit optimizations a lot. 1 Share this post Link to post Share on other sites
Monkey 1,327 #10808 Posted December 10, 2020 12 minutes ago, cinnr said: Anyone have insight into why it takes multiple days to change foils (as Anderson Reggio said in the above podcast)? Seems like it will limit optimizations a lot. There’s a fair amount of control systems for the flaps, assorted fairing, etc. It’s not really a big deal because they have to choose their foils pretty far in advance. They can’t swap based on tomorrow’s forecast. Share this post Link to post Share on other sites
buckdouger 245 #10809 Posted December 10, 2020 3 hours ago, weta27 said: Heard back, not looking good for today, damn it. Would be interesting to know how many views your work gets vs most accredited journalists. I suspect you are right up there. Too bad, but thanks for continuing to post what you do. 1 hour ago, Stingray~ said: AM do a great job with the production quality of their videos. Share this post Link to post Share on other sites
barfy 1,113 #10810 Posted December 10, 2020 1 hour ago, buckdouger said: AM do a great job with the production quality of their videos. Looked like someone's favorite movie was 300, what with the timing and the gladiator references. I think that LR has nice style as well. 1 Share this post Link to post Share on other sites
Flippin Out 129 #10811 Posted December 10, 2020 3 hours ago, Stingray~ said: ...............except not today because we broke something on Tuesday. Share this post Link to post Share on other sites
Apterix 91 #10812 Posted December 10, 2020 3 hours ago, Monkey said: There’s a fair amount of control systems for the flaps, assorted fairing, etc. It’s not really a big deal because they have to choose their foils pretty far in advance. They can’t swap based on tomorrow’s forecast. Maybe not, but could they exchange the foil flaps, foil tips or other foil fairings to change the foils flight/drag characteristics for lighter or heavier winds? I can't see anything in the rule that would prohibit this, but I may be missing something. Thoughts anyone....... Share this post Link to post Share on other sites
Apterix 91 #10813 Posted December 10, 2020 1 minute ago, Apterix said: Maybe not, but could they exchange the foil flaps, foil tips or other foil fairings to change the foils flight/drag characteristics for lighter or heavier winds? I can't see anything in the rule that would prohibit this, but I may be missing something. Thoughts anyone....... I mean exchange within the 20% mass allowance... Share this post Link to post Share on other sites
nav 576 #10814 Posted December 12, 2020 ^ 31.12 (f) of the AC75 Rule states that the foil, rudder and mast configuration will be included in the measurement certificate.... 31.13 (c) states that said certificate becomes invalid if any of those^ are modified according to 5.10 5.10 (b)(i) demands that 80% of the mass remains unmodified so yep - looks possible Share this post Link to post Share on other sites
Enzedel92 106 #10815 Posted December 12, 2020 What did they break? Share this post Link to post Share on other sites
The_Alchemist 1,256 #10816 Posted December 13, 2020 AM has got to be up to something.. they haven't opened the doors since they returned from the first day of pre-start testing and the lights have been every night. Would suspect that AM has some planned modifications just like Tony Dexter said was in store for the UK Rita2. One now for the xmas cup and the other for the challenger series, both are planed to be too later for others to copy. Patriot just completed some control system updates last week, came out for the one pre-start match up with NZ and then went back in for most likely more visible updates. 1 Share this post Link to post Share on other sites
MaxHugen 698 #10817 Posted December 13, 2020 16 minutes ago, The_Alchemist said: AM has got to be up to something.. they haven't opened the doors since they returned from the first day of pre-start testing and the lights have been every night. Would suspect that AM has some planned modifications just like Tony Dexter said was in store for the UK Rita2. One now for the xmas cup and the other for the challenger series, both are planed to be too later for others to copy. Patriot just completed some control system updates last week, came out for the one pre-start match up with NZ and then went back in for most likely more visible updates. The controllers must be quite an effort. ETNZ said they were up to 8-9 iteration of controllers - I think he was referring the the mainsail controller. Everything on these boats is measured in tenths, if not hundredths of degrees or whatever - main angles/cambers/twist/mast bend... etc etc etc. But they have to be able to respond in milliseconds to sudden large changes as well, for gusts, tacks/gybes, mark rounding and so on. Designing those controllers would be a challenge. Share this post Link to post Share on other sites
mako23 436 #10818 Posted December 13, 2020 3 hours ago, The_Alchemist said: AM has got to be up to something.. they haven't opened the doors since they returned from the first day of pre-start testing and the lights have been every night. Would suspect that AM has some planned modifications just like Tony Dexter said was in store for the UK Rita2. One now for the xmas cup and the other for the challenger series, both are planed to be too later for others to copy. Patriot just completed some control system updates last week, came out for the one pre-start match up with NZ and then went back in for most likely more visible updates. I agree you don’t go into your shed and not practice for fun. I’m suspecting some changes are going to be happening Share this post Link to post Share on other sites
Man Overboard 7 #10819 Posted December 13, 2020 No doubt they also had their schedules baked in a long time ago and these practice sessions are a late arrival. At this stage of the game no team is going to sacrifice their plans for some practice races. If you were otherwise going to be out on the water then fine, but if was meant to be in the shed that's where it should be. I don't think we can read too much into it. 2 Share this post Link to post Share on other sites
Priscilla 2,318 #10820 Posted December 13, 2020 2 hours ago, mako23 said: I agree you don’t go into your shed and not practice for fun. I’m suspecting some changes are going to be happening I hope you are right here’s my take all 3 contenders got out on the same track as Te Rehutai encountered something pretty freaky fast went back to shed and realistically are all clutching at straws as to where to go next. It’s a design and technology race have a close look at all the syndicates offerings it’s night and day the opposition have nothing in response to those tricky kiwis. Rock on Thursday. Share this post Link to post Share on other sites
terrafirma 1,062 #10821 Posted December 13, 2020 So is that it until December 17th? Share this post Link to post Share on other sites
enigmatically2 758 #10822 Posted December 13, 2020 30 minutes ago, Priscilla said: I hope you are right here’s my take all 3 contenders got out on the same track as Te Rehutai encountered something pretty freaky fast went back to shed and realistically are all clutching at straws as to where to go next. It’s a design and technology race have a close look at all the syndicates offerings it’s night and day the opposition have nothing in response to those tricky kiwis. Rock on Thursday. They are unlikely to have taken shock at NZ and then simulated the alternatives, designed and developed to the point they area ready to modify. I agree with others that these were preplanned and either someone stuck the practise races in late, or they just didn't want to play anyway 2 Share this post Link to post Share on other sites
nav 576 #10823 Posted December 13, 2020 "Just give me the damn burgee and I'll go out...." 3 Share this post Link to post Share on other sites
sailman 147 #10824 Posted December 13, 2020 Realistically, none of the challengers want to show the defender anything. To say that they were scared by the Kiwi performance is somewhat laughable. Why would you show your hand to the defender this early in the game? 3 Share this post Link to post Share on other sites
Nutta 390 #10825 Posted December 13, 2020 The challengers will have development left to do that will significantly aid performance. But so will ETNZ. My cat reckons ETNZ are ahead now and have a big bag of tricks that will outrun the challengers until March. Share this post Link to post Share on other sites
DayTripper 48 #10826 Posted December 13, 2020 42 minutes ago, sailman said: Realistically, none of the challengers want to show the defender anything. To say that they were scared by the Kiwi performance is somewhat laughable. Why would you show your hand to the defender this early in the game? Why then did they match up at all? Share this post Link to post Share on other sites
NZL3481 383 #10827 Posted December 13, 2020 39 minutes ago, sailman said: Realistically, none of the challengers want to show the defender anything. To say that they were scared by the Kiwi performance is somewhat laughable. Why would you show your hand to the defender this early in the game? You may not, but if you've had your pants pulled down, you may not have a choice. My guess is any upgrades they had scheduled for after the Christmas Cup have been brought forward as the challengers need some more firepower. 1 Share this post Link to post Share on other sites
enigmatically2 758 #10828 Posted December 13, 2020 1 hour ago, NZL3481 said: You may not, but if you've had your pants pulled down, you may not have a choice. My guess is any upgrades they had scheduled for after the Christmas Cup have been brought forward as the challengers need some more firepower. Why on earth would they do that. Even assuming they think NZ is faster, would that be a reason to now develop in way that is sub optimal? They will stick to their plans which may or may not have upgrades now or after the regatta or both. 2 Share this post Link to post Share on other sites
dullers 405 #10829 Posted December 13, 2020 On 12/7/2020 at 7:55 AM, terrafirma said: I wouldn't be surprised if AM surprised the challengers. She's been on the water the longest, always looks stable and seems to tack and gybe well. Of the challengers they are the least in your face going about their business quietly. Whilst her hull doesn't appear as extreme as the others it still looks like a very fast boat. Only 10 days now until we see some racing. Who knows what the future holds? I dont think any of the teams is in your face. It is media driven not team driven. If anything we know very little about the boats and teams at the moment. The media seem to focus on 2 teams more than the others but even that might be an illusion created by my own bias and interest. I do think they have the best looking boat. For some reason it looks like a Spitfire. Nice curves. The rest look like ME109s. Sort of more edges. 1 Share this post Link to post Share on other sites
The_Alchemist 1,256 #10830 Posted December 13, 2020 11 hours ago, MaxHugen said: The controllers must be quite an effort. ETNZ said they were up to 8-9 iteration of controllers - I think he was referring the the mainsail controller. Everything on these boats is measured in tenths, if not hundredths of degrees or whatever - main angles/cambers/twist/mast bend... etc etc etc. But they have to be able to respond in milliseconds to sudden large changes as well, for gusts, tacks/gybes, mark rounding and so on. Designing those controllers would be a challenge. The interview with the AM flight controller said they were on the 6th or 7th iteration of his controller already. Constant improvements to make it better and more intuitive. Share this post Link to post Share on other sites
dullers 405 #10831 Posted December 13, 2020 4 hours ago, DayTripper said: Why then did they match up at all? Well they did not. The Prada Kiwi thing amounted to nothing. Both had different sails up for a start. Was that a bad sail call? Was it done on purpose? Were Prada trying something else? We just don't know. There is a good interview on Utube where the guy basically said they will operate at 90% until the proper race starts for the Prada cup. They will then bring in mods that are put on so as to give the other teams little chance to develop and copy. He said even the Christmas races will give you a false incite into how the teams are going. 1 Share this post Link to post Share on other sites
The_Alchemist 1,256 #10832 Posted December 13, 2020 6 hours ago, Priscilla said: I hope you are right here’s my take all 3 contenders got out on the same track as Te Rehutai encountered something pretty freaky fast went back to shed and realistically are all clutching at straws as to where to go next. It’s a design and technology race have a close look at all the syndicates offerings it’s night and day the opposition have nothing in response to those tricky kiwis. Rock on Thursday. Of course you would think they are all cowering in fear of the great kiwis. Of all the teams, it is the kiwis that are the probably the most worried because of the overhead photos that reveled parts of their lower sail control and the cockpits. They are the team that has done the most work so far on controlling the separation of the bottom of the twin sails. Now, every other team knows exactly how and what they are doing. I think they pulled that rabbit out of the hat a little too early. 1 Share this post Link to post Share on other sites
dullers 405 #10833 Posted December 13, 2020 On 12/7/2020 at 7:55 AM, terrafirma said: I wouldn't be surprised if AM surprised the challengers. She's been on the water the longest, always looks stable and seems to tack and gybe well. Of the challengers they are the least in your face going about their business quietly. Whilst her hull doesn't appear as extreme as the others it still looks like a very fast boat. Only 10 days now until we see some racing. Who knows what the future holds? We wont learn anything until the Prada cup to be honest. Share this post Link to post Share on other sites
Raptorsailor 308 #10834 Posted December 13, 2020 11 hours ago, MaxHugen said: The controllers must be quite an effort. ETNZ said they were up to 8-9 iteration of controllers - I think he was referring the the mainsail controller. Everything on these boats is measured in tenths, if not hundredths of degrees or whatever - main angles/cambers/twist/mast bend... etc etc etc. But they have to be able to respond in milliseconds to sudden large changes as well, for gusts, tacks/gybes, mark rounding and so on. Designing those controllers would be a challenge. Pretty sure if they're down to tenth's, even hundredths of degrees the designers have gone fuck it and use minutes of angle. Much more practical when measuring tiny angles. 1 Share this post Link to post Share on other sites
Enzedel92 106 #10835 Posted December 13, 2020 American Magic don’t look very stable in a straight line. Maybe like Oracle of 2013? A bitch to sail but once dialed in - should scream. Share this post Link to post Share on other sites
enigmatically2 758 #10836 Posted December 13, 2020 9 minutes ago, Raptorsailor said: Pretty sure if they're down to tenth's, even hundredths of degrees the designers have gone fuck it and use minutes of angle. Much more practical when measuring tiny angles. Or radians Share this post Link to post Share on other sites
dullers 405 #10837 Posted December 13, 2020 6 hours ago, Priscilla said: I hope you are right here’s my take all 3 contenders got out on the same track as Te Rehutai encountered something pretty freaky fast went back to shed and realistically are all clutching at straws as to where to go next. It’s a design and technology race have a close look at all the syndicates offerings it’s night and day the opposition have nothing in response to those tricky kiwis. Rock on Thursday. I have heard the other 3 are booked to fly home and chain saw their boats. Or it could be that one of the major advantages the defenders have is they can not give Team Middle East practice by racing them. These practice races are not needed by the challengers so much. We could just admit that we still don't know how the boats relate to each other and leave our swagger sticks until the proper race. 1 Share this post Link to post Share on other sites
dullers 405 #10838 Posted December 13, 2020 5 hours ago, Nutta said: The challengers will have development left to do that will significantly aid performance. But so will ETNZ. My cat reckons ETNZ are ahead now and have a big bag of tricks that will outrun the challengers until March. Are you from New Zealand per chance? Share this post Link to post Share on other sites
dullers 405 #10839 Posted December 13, 2020 5 hours ago, NZL3481 said: You may not, but if you've had your pants pulled down, you may not have a choice. My guess is any upgrades they had scheduled for after the Christmas Cup have been brought forward as the challengers need some more firepower. How come you and a few other Kiwis know things about how the boats stack up when the rest of us still dont have a clue? It is nice to see you support your team but maybe big noting them with out any clear evidence just makes posts like these risible. What incites into The All Black England game in the World Cup did you have? Share this post Link to post Share on other sites
nav 576 #10840 Posted December 13, 2020 100 years of domination.......so nothing really solid Share this post Link to post Share on other sites
Sailbydate 2,575 #10841 Posted December 13, 2020 7 hours ago, NZL3481 said: You may not, but if you've had your pants pulled down, you may not have a choice. My guess is any upgrades they had scheduled for after the Christmas Cup have been brought forward as the challengers need some more firepower. This. 1 Share this post Link to post Share on other sites
Sailbydate 2,575 #10842 Posted December 13, 2020 1 hour ago, dullers said: 7 hours ago, Nutta said: The challengers will have development left to do that will significantly aid performance. But so will ETNZ. My cat reckons ETNZ are ahead now and have a big bag of tricks that will outrun the challengers until March. Are you from New Zealand per chance? So, ETNZ have run out of innovation? I wouldn't put your money on that one. Share this post Link to post Share on other sites
dullers 405 #10843 Posted December 13, 2020 9 minutes ago, Sailbydate said: So, ETNZ have run out of innovation? I wouldn't put your money on that one. I suspect there is a lot of innovation on each boat. All the countries involved have backgrounds of being innovative. My guess is it will come down more to which paths they went down to seek the edge. I think all teams gamble and can get it wrong and masts fall down or even boats sink or it just ends up not giving the speed etc that they wanted. It is risky technology . 1 Share this post Link to post Share on other sites
Sailbydate 2,575 #10844 Posted December 13, 2020 11 minutes ago, dullers said: I suspect there is a lot of innovation on each boat. All the countries involved have backgrounds of being innovative. My guess is it will come down more to which paths they went down to seek the edge. I think all teams gamble and can get it wrong and masts fall down or even boats sink or it just ends up not giving the speed etc that they wanted. It is risky technology . Well, TNZ has had its share of blue buckets, falling sticks, and the odd pitchpole. Can't disagree with you there. Share this post Link to post Share on other sites
The_Alchemist 1,256 #10845 Posted December 13, 2020 23 minutes ago, Sailbydate said: So, ETNZ have run out of innovation? I wouldn't put your money on that one. Every team has plenty of room for innovation. We may be getting to the point where the next series are refinements and not major performance jumps. It is possible that smaller performance refinements can be nullified by better crew work by your opponents, it is the larger performance gains that leave your opponents in you wake. Share this post Link to post Share on other sites
I14RACER 187 #10846 Posted December 13, 2020 34 minutes ago, The_Alchemist said: Every team has plenty of room for innovation. We may be getting to the point where the next series are refinements and not major performance jumps. It is possible that smaller performance refinements can be nullified by better crew work by your opponents, it is the larger performance gains that leave your opponents in you wake. I liken the innovation to a curve that flattens out at the top. There’s the statistical norm called “rate of diminishing return”. Where the advancements made in whatever tech or device is quick at first with huge gains and then as the large gains have been realized the amount of improvement slows with each innovation to the point where there is no real gain from the investment in design. I think NZL made huge gains with B2 and no doubt there is probably some left. But I doubt it is anywhere near the gains made with B2. That leaves room for the other teams to catch before the Cup races. Time will tell who planned their big moves at the right time. Share this post Link to post Share on other sites
FinnFish 206 #10847 Posted December 13, 2020 25 minutes ago, I14RACER said: I liken the innovation to a curve that flattens out at the top. There’s the statistical norm called “rate of diminishing return”. Where the advancements made in whatever tech or device is quick at first with huge gains and then as the large gains have been realized the amount of improvement slows with each innovation to the point where there is no real gain from the investment in design. I think NZL made huge gains with B2 and no doubt there is probably some left. But I doubt it is anywhere near the gains made with B2. That leaves room for the other teams to catch before the Cup races. Time will tell who planned their big moves at the right time. While modifications and 'planned refinements' are obviously critical you still need to sail it and get it around the track. Therefore time on the water with said mods and refinements is just as important. Share this post Link to post Share on other sites
NZL3481 383 #10848 Posted December 13, 2020 8 hours ago, enigmatically2 said: Why on earth would they do that. Even assuming they think NZ is faster, would that be a reason to now develop in way that is sub optimal? They will stick to their plans which may or may not have upgrades now or after the regatta or both. The difference to being slower and a lot slower than the defender is probably the answer. Given the lights are on in their sheds 24/7 after their first real contact with the Defender is telling. You bring your upgrades forward so you create time to bring the other upgrades forward, which allows time for more unscheduled upgrades because you know you're going to need them. Share this post Link to post Share on other sites
NZL3481 383 #10849 Posted December 13, 2020 5 hours ago, dullers said: How come you and a few other Kiwis know things about how the boats stack up when the rest of us still dont have a clue? It is nice to see you support your team but maybe big noting them with out any clear evidence just makes posts like these risible. What incites into The All Black England game in the World Cup did you have? Sometimes it's about who you know and who you work for... 1 Share this post Link to post Share on other sites
dullers 405 #10850 Posted December 13, 2020 33 minutes ago, NZL3481 said: Sometimes it's about who you know and who you work for... I nearly replied....... Share this post Link to post Share on other sites
dullers 405 #10851 Posted December 14, 2020 6 hours ago, Sailbydate said: So, ETNZ have run out of innovation? I wouldn't put your money on that one. Pretty sure none of them have. Share this post Link to post Share on other sites
The_Alchemist 1,256 #10852 Posted December 14, 2020 Patriot left the dock before the NZ boat today. Share this post Link to post Share on other sites
Nutta 390 #10853 Posted December 14, 2020 17 hours ago, dullers said: Are you from New Zealand per chance? Yup. Blatant bias is as good a method for picking relative speeds of the teams as anything else just now... 1 Share this post Link to post Share on other sites
winchfodder 277 #10854 Posted December 14, 2020 It looks like they are still dragging around their boom? Share this post Link to post Share on other sites
P Flados 198 #10857 Posted December 15, 2020 Not quite dry, but it looks like AM pulled off a 360 not much worse than the LR one (video just above the previous post) Share this post Link to post Share on other sites
jaysper 613 #10858 Posted December 15, 2020 9 minutes ago, P Flados said: Not quite dry, but it looks like AM pulled off a 360 not much worse than the LR one (video just above the previous post) Be interested to see how much use they make of 360s in the starts. Share this post Link to post Share on other sites
Stingray~ 1,405 #10859 Posted December 15, 2020 1 hour ago, fish7yu said: That video is a superb production. Thank you so much for all the effort, appreciated! Share this post Link to post Share on other sites
The_Alchemist 1,256 #10860 Posted December 15, 2020 2 hours ago, fish7yu said: They sure are looking low to the water and stable. What ever they did is making it look easy. Share this post Link to post Share on other sites
The_Alchemist 1,256 #10861 Posted December 15, 2020 1 hour ago, P Flados said: Not quite dry, but it looks like AM pulled off a 360 not much worse than the LR one (video just above the previous post) yes, LR was all at once and AM did it in two steps Share this post Link to post Share on other sites
Priscilla 2,318 #10864 Posted December 15, 2020 New mainsail no woolies looks very smart. 1 Share this post Link to post Share on other sites
Horn Rock 1,323 #10865 Posted December 15, 2020 ^^^ Those rounded hull sections suggests she'll roll more in displacement mode, and have less RM than TR with her flat sections and prominent edges astern. Share this post Link to post Share on other sites
WindySurfer 12 #10866 Posted December 15, 2020 1 hour ago, Horn Rock said: ^^^ Those rounded hull sections suggests she'll roll more in displacement mode, and have less RM than TR with her flat sections and prominent edges astern. Concur. We have all seen TR's special dance to get foiling in low winds: flat, then heeled, then flat again but just riding the guppy belly, then liftoff. Doesn't look like Patriots hull shape gives it a shot in hell at pulling that off. Hopefully the races aren't at the lower wind limits. 1 Share this post Link to post Share on other sites
terrafirma 1,062 #10867 Posted December 15, 2020 10 minutes ago, WindySurfer said: Concur. We have all seen TR's special dance to get foiling in low winds: flat, then heeled, then flat again but just riding the guppy belly, then liftoff. Doesn't look like Patriots hull shape gives it a shot in hell at pulling that off. Hopefully the races aren't at the lower wind limits. That's a worry but not as bad if it guarantees some wins in the higher end range. Pushing the boat into a corner is not what TR will be doing. We know so far TR is fast in the lighter conditions. Share this post Link to post Share on other sites
Terry Hollis 319 #10868 Posted December 15, 2020 2 hours ago, Horn Rock said: ^^^ Those rounded hull sections suggests she'll roll more in displacement mode, and have less RM than TR with her flat sections and prominent edges astern. I don't agree, the rounded hull sections only affect hull stability when the boat is stationary, as soon as it moves the leeward foil gives extra stability as the fulcrum moves out towards the leeward foil making the form shape irrelevant to stability. Share this post Link to post Share on other sites
Mudz 17 #10869 Posted December 15, 2020 48 minutes ago, WindySurfer said: Hopefully the races aren't at the lower wind limits. The AC will be. Share this post Link to post Share on other sites
terrafirma 1,062 #10870 Posted December 15, 2020 11 minutes ago, Terry Hollis said: I don't agree, the rounded hull sections only affect hull stability when the boat is stationary, as soon as it moves the leeward foil gives extra stability as the fulcrum moves out towards the leeward foil making the form shape irrelevant to stability. I think the point he's making is the boats ability to get up on the foils in comparison to ETNZ. So the question was with regards to AM's rounded hull section vs TR flat in the process of getting up on the foils, not once the boat is foiling Share this post Link to post Share on other sites
terrafirma 1,062 #10871 Posted December 15, 2020 7 hours ago, fish7yu said: To my eye the Kiwis look considerably faster in these conditions. Share this post Link to post Share on other sites
Terry Hollis 319 #10872 Posted December 15, 2020 3 minutes ago, terrafirma said: I think the point he's making is the boats ability to get up on the foils in comparison to ETNZ. So the question was with regards to AM's rounded hull section vs TR flat in the process of getting up on the foils, not once the boat is foiling He referred to the RM and that is what I responded to, I agree that the rounded sections lose the wetted surface more quickly and that helps the hull to get flying, Share this post Link to post Share on other sites
jaysper 613 #10873 Posted December 15, 2020 1 hour ago, terrafirma said: To my eye the Kiwis look considerably faster in these conditions. You must have farking good eyes. Share this post Link to post Share on other sites
classfve 6 #10874 Posted December 15, 2020 5 minutes ago, jaysper said: Yup. There was about 20 seconds of AM and impossible to draw any conclusions. Share this post Link to post Share on other sites
nav 576 #10875 Posted December 15, 2020 7 hours ago, P Flados said: Not quite dry, but it looks like AM pulled off a 360 not much worse than the LR one (video just above the previous post) There was about 17 seconds between the beginnings of each board lift (09:01....). 15 seconds was the system recharge time mentioned when the FCS was a working prototype. I wonder if they can do any better than that by now through updates or mods - or if that is a hard limit? Share this post Link to post Share on other sites
Horn Rock 1,323 #10876 Posted December 15, 2020 4 hours ago, Terry Hollis said: I don't agree, the rounded hull sections only affect hull stability when the boat is stationary, as soon as it moves the leeward foil gives extra stability as the fulcrum moves out towards the leeward foil making the form shape irrelevant to stability. It seems for the first few knots the pivot point is still under the hull, with the rocking motion we've seen from TR. Share this post Link to post Share on other sites
The_Alchemist 1,256 #10877 Posted December 15, 2020 7 hours ago, Horn Rock said: ^^^ Those rounded hull sections suggests she'll roll more in displacement mode, and have less RM than TR with her flat sections and prominent edges astern. This is humorous considering how sticky everyone said the Defiant hull was compared to the NZ B1 that was shaped like a fishing bobber. Don’t be deceived by some of those shots, Patriot has a very wide hull at the stern. You can see from lift off videos that AM and NZ B2’s have different approaches to take off. NZ heels slightly to simulate a two hulled cat and air is forced under the hull and it lifts out almost horizontally. AM lifts out bow first with very little heel. The AM hull has a pronounced rocker from front to back (the guppy like chest) while NZ has what could be described as rails or skis that it rides on and then lifts up. Share this post Link to post Share on other sites
Terry Hollis 319 #10878 Posted December 15, 2020 1 hour ago, Horn Rock said: It seems for the first few knots the pivot point is still under the hull, with the rocking motion we've seen from TR. If the boat is so slow that the leeward foil is not helping the wind is so low that foiling is not going to happen, the round shape will still be better in displacement mode. I think INEOS made a grave mistake with their box shaped skeg. Share this post Link to post Share on other sites
Horn Rock 1,323 #10879 Posted December 15, 2020 8 minutes ago, Terry Hollis said: I think INEOS made a grave mistake with their box shaped skeg. Agree. They look the most sticky in the light stuff. Share this post Link to post Share on other sites
The_Alchemist 1,256 #10880 Posted December 15, 2020 Share this post Link to post Share on other sites
mako23 436 #10881 Posted December 15, 2020 On 12/13/2020 at 11:06 PM, sailman said: Realistically, none of the challengers want to show the defender anything. To say that they were scared by the Kiwi performance is somewhat laughable. Why would you show your hand to the defender this early in the game? Good on AM beating ETNZ in a practice race. I see the media tried to make excuses. It’s good that ETNZ were faster than anyone myth has been broken. Good wake up call to ETNZ that they need to keep developing and improving, 3 Share this post Link to post Share on other sites
kenergy 562 #10882 Posted December 15, 2020 1 minute ago, mako23 said: Good wake up call to ETNZ that they need to keep developing and improving, Somehow I think they never lose sight of that reality since san fran. 4 Share this post Link to post Share on other sites
Apterix 91 #10883 Posted December 15, 2020 2 hours ago, The_Alchemist said: The LR and ETNZ sail plans look much more evenly matched in this race that the one earlier in the week. A reason for more even match up perhaps? Share this post Link to post Share on other sites
dullers 405 #10884 Posted December 15, 2020 14 hours ago, terrafirma said: To my eye the Kiwis look considerably faster in these conditions. Were those eyes made in NZ? Share this post Link to post Share on other sites
Apterix 91 #10885 Posted December 15, 2020 5 minutes ago, Apterix said: The LR and ETNZ sail plans look much more evenly matched in this race that the one earlier in the week. A reason for more even match up perhaps? Also, what do you reckon the holes/see through patches in luff of LR and ETNZ jibs are for? There are 3 on the LR jib and 1 on the ETNZ jib. Share this post Link to post Share on other sites
atwinda 95 #10886 Posted December 15, 2020 5 minutes ago, Apterix said: Also, what do you reckon the holes/see through patches in luff of LR and ETNZ jibs are for? There are 3 on the LR jib and 1 on the ETNZ jib. tell tale windows. Share this post Link to post Share on other sites
Apterix 91 #10887 Posted December 15, 2020 6 minutes ago, atwinda said: tell tale windows. That makes sense. Share this post Link to post Share on other sites
MrBump 69 #10888 Posted December 15, 2020 After listening to the press conference this morning, it reaffirms that T Hutch is a class Act. 4 Share this post Link to post Share on other sites
Monkey 1,327 #10889 Posted December 15, 2020 1 hour ago, MrBump said: After listening to the press conference this morning, it reaffirms that T Hutch is a class Act. Just curious, but what did he say? Share this post Link to post Share on other sites
Indio 891 #10890 Posted December 15, 2020 13 minutes ago, Monkey said: Just curious, but what did he say? Here's the full replay for you 1 Share this post Link to post Share on other sites
MrBump 69 #10891 Posted December 15, 2020 14 minutes ago, Monkey said: Just curious, but what did he say? Not much said at the conference in terms of interesting information but he just comes across as a genuine guy with immense knowledge, no arrogance or attitude, just a nice likable guy. Even though he's here trying to take our cup from us you cant help but like the guy. 3 Share this post Link to post Share on other sites