Airwick

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About Airwick

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    Anarchist

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    Victoria, BC
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    Sailing?

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  1. Airwick

    Show your boat sailing thread

    No coffee was harmed in the making of this video: https://www.facebook.com/Teampestou/videos/438194477428032/
  2. Airwick

    Race to Alaska best boat

    That's interesting, although I think it depends what you mean by "light air"... For those not familiar with PNW sailing (and potentially extended periods during the R2AK), this is what that looks like: https://fb.watch/1iU3JdSVvK/. And at that point it's really all about wetted surface (given comparable sailing skills) and my experience is that any reasonably powered up mono just does relatively better in these conditions than multis. I'm not sure what would make the Seacart so special it would keep up with a TP52 in these conditions, but I would be interested to learn if that's truly the case! 5 to 10kt of wind would be an entirely different discussion...
  3. Airwick

    Multihull speed vs length

    I'm guessing it's just a combination of things. The foils definitely are definitely fairly "fat" so that could be a good part for it, but I'm thinking it also has to do with the ama drag. At that point the main hull is is mostly riding on the flatter aft section so should be able to skim at higher speed but the ama is plowing through the water and its drag might be increasing exponentially at that point. It's also shorter overall so if you used the ama length the multiplier would be higher.
  4. Airwick

    Multihull speed vs length

    My experience on the F-24 is that there is a definite "wall" between 19-20kt: I have done in the 18s quite a few times but only exceeded 19 a couple of times. Things feel under control at 18 but very different at 19... This was all in flat-ish water (i.e. chop only) so with a waterline length of 23.5ft that's a multiplier of around 4...
  5. Another unknown quantity is the relationship between the builder and the design house/ customer... If whoever was contracting Triac to build the Searail squeezed them on price timeline etc, they might have been a lot more likely to cut some corners. It wouldn't be uncommon for the same builder to produce different quality based on the customer. And that could be a good thing if that's what the customer is asking for/willing to pay for.
  6. Airwick

    Race to Alaska best boat

    With 2 guys on a fast boat (planning on <5 days), I don't think you would have to use the autopilot that much. Also during the night the autopilot will avoid the logs just about as well as a helmsperson (i.e. it won't either...). But obviously every hour of daylight you use the autopilot increases your odds of hitting something. All you can really do is make sure you are going slow enough so that you don't get catastrophic damage when you do hit something... A race like this will always require a significant amount of luck to complete successfully/wing regardless of crew, gear and preparation.
  7. Airwick

    Race to Alaska best boat

    Interesting, I ran the number and I have a similar 95Ah lead acid battery and a 95W solar panel. For R2AK the days are long so that should keep in all but the worst rainy days. I ran the number and expect to get just over 48h of autonomy with 18h of autopilot a day. This is based on measured draws for nav lights, radio, instruments, autopilot (assuming twice the power use from what I measured in a light chop), 4h of a Wallas heater per day (assuming I actually get and install one), and some allowance for cabin lights and USB charger. Of note is that in fairly flat water, the autopilot actually uses less power than the radio (that's a VHF with integrated AIS receiver). Do you have an AIS transponder or just receiver (if it's a separate receiver from the radio that would also draw a lot more)? These are surprisingly power hungry (my VHF alone ends up being over 30% of my total power budget).
  8. Airwick

    Race to Alaska best boat

    Don't forget https://r2ak.com/2019-teams-full-race/team-shut-up-and-drive/ on a Figaro and these guys: https://r2ak.com/2017-teams-full-race/team-phocoena/ on a tricat... I agree having to rest/sleep is going to be a major slow down... That said I think a team of two "singlehander" should be the fastest on pretty much anything small as you need some good weight carrying capacity for a 3rd crew + gear to be a net gain to overall performance. Obviously it's not a definite rule and it depends on skills as well as average conditions on the course. It would be interesting to see what performance difference there is between 2 and 3 crew on something like a Seacart as well as how well it goes under human power (which can play a significant role even on a fast boat...). One key area where an extra body might make up for the weight would be in being able to use human propulsion for longer to "motorsail" in marginal conditions. Mad dog is a bit of an outlier as it's so powered up that the 3 crew makes sense there but I would think Elsie Piddock might have been faster with 2 crew (obviously depending on skills, specific conditions, etc...)... Anyway, it looks like I flipped flopped several times one which side of the argument to be on several times just in this one post... I think the bottom line is that there are so many variables I don't think there's a definite answer. I actually think a purpose-built human power only machine good win this: I'm thinking something like a 50' proa with 6 pedaling stations and 12 pro cyclists should be able to average 7 or 8 knots required to beat course record (or at least come in first, especially on a light wind year)... it'd be interesting to run the numbers on that! PS: I was born about 50km from the "border" so I am almost Breton if that counts for anything...
  9. Airwick

    Jules Verne Trophy 2020

    Keep in mind the boom on Sodebo is a lot lower and behind the coach roof so the boom and sail bag are not in the air flow. There's a bit of turbulence shaking the bag but it doesn't look like that would cause much drag. They also had a soft cover closing the gap under the boom from the start. They do have a fairing on the aft beam but it looks a lot smaller and probably not quite as effective, probably more gains to be had there than with boom...
  10. Right, that's why I said "typically required"... I guess what I am saying is that it's a lot trickier to achieve stability with a lifting tail/weather helm and the equilibrium is more "fragile". Gliders are designed for peak efficiency and operate in a (relatively) narrow speed and loading range so it makes sense there but the vast majority of airplanes out there use negative lift on the tail. In practice there may be certain cases where you might be able to achieve stability with weather helm but it will only work under narrow specific conditions. If a gust or a wake disturb things enough you are a lot more likely to get gybing or rounding up than if setup with lee helm to start with. As a side note, fine tuning balance is a lot easier with a spit rig so it should be easier to achieve stability with weather helm on a ketch than a sloop! I wonder why there are almost no boats with the rudder up front... Obviously it's a lot more vulnerable to impacts so that's a good reason not to do it but for inshore race boats that probably wouldn't be a show stopper. I guess if your are going to steer from the back it adds complication and it would handle a bit "weird" compared to other boats. Would be fun to take an old IOR boat, move the keel back a foot or two and stick the rudder in front to see if it stops rounding for no reason!
  11. They should in theory be more efficient as you don't need the negative lift on the tail (typically required to achieve acceptable stability). The negative lift means more total lift is required on the main wing, hence more drag. Basically a conventional plane is setup to always have lee "helm" for stability, which also works on a sailboat: if you have lee helm you should be able to lash the tiller and the boat will luff when it speeds up and fall off when it slows down, generally maintaining a given angle with the wind (which doesn't work with weather helm!) So in theory it should be more efficient if everything else is equal but in practice there is so much more going on that it just gets lost in the noise. But now we are talking about putting the rudder up front, which is a whole other story...
  12. Yes, that's also why the "canard" wings are more efficient in theory as by placing the elevator in front, it can be configured to always be lifting in a stable configuration.
  13. Yeah it's not... https://www.statista.com/statistics/233910/poverty-rates-in-oecd-countries/ Out of all OECD countries, Israel had the highest poverty rate as of 2017, at 17.9 percent. The country with the second highest poverty rate was the United States, with 17.8 percent. The significance of the OECD The OECD, or the Organisation for Economic Co-operation and Development, was founded in 1948 and is made up of 36 member countries. It seeks to improve the economic and social well-being of countries and their populations. The OECD looks at issues that impact people’s everyday lives and proposes policies that can help to improve the quality of life. Poverty in the United States In 2018, there were 38.15 million people living below the poverty line in the U.S. About 20.8 percent of the African American population lived in poverty in 2018, the most out of any ethnicity. In addition, more young women lived in poverty than young men. It is clear that poverty in the United States is a complex, multi-faceted issue that affects millions of people and will require a solution for the country to move forward.
  14. Yeah, you might want to use the same source to compare both so that the same definition of "poverty" is used... According to the site you provided: https://www.statista.com/statistics/233910/poverty-rates-in-oecd-countries/, the US is second worst of all OECD countries at 17.8% vs Canada's "middle of the pack" 12.1%... You are "doing very well" indeed, almost at No1! And with the recent tax cuts for the wealthy, I'm pretty sure you'll reach first place shortly! Why let facts get in the way of a good story, right? Looks like someone needs to stop watching Fox! Edit: forgot to talk about the boat! Yeah, it's just dumb! Just a giant pissing contest resulting in something completely impractical while consuming insane amount of resources! Hard to see how anyone needs or deserves to be so wealthy they can inflict this on the world...
  15. Airwick

    Single mission or multiple mission boats

    Just to add to the discussion: the choice to require the shroud to be loosened for folding on the earlier designs was a conscious decision by Ian (or rather a side effect). Basically it means the rig tension keeps the boat unfolded, and there is a story about prospective customers questioning the strength of the beam holdown bolts and Ian would remove them during the test sail to convince them of the safety of the design. Once proven and accepted, the folding geometry of newer design was made to allow folding without releasing the shrouds, which also means it would fold if you took the bolts out wile sailing!