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    • UnderDawg

      A Few Simple Rules   05/22/2017

      Sailing Anarchy is a very lightly moderated site. This is by design, to afford a more free atmosphere for discussion. There are plenty of sailing forums you can go to where swearing isn't allowed, confrontation is squelched and, and you can have a moderator finger-wag at you for your attitude. SA tries to avoid that and allow for more adult behavior without moderators editing your posts and whacking knuckles with rulers. We don't have a long list of published "thou shalt nots" either, and this is by design. Too many absolute rules paints us into too many corners. So check the Terms of Service - there IS language there about certain types of behavior that is not permitted. We interpret that lightly and permit a lot of latitude, but we DO reserve the right to take action when something is too extreme to tolerate (too racist, graphic, violent, misogynistic, etc.). Yes, that is subjective, but it allows us discretion. Avoiding a laundry list of rules allows for freedom; don't abuse it. However there ARE a few basic rules that will earn you a suspension, and apparently a brief refresher is in order. 1) Allegations of pedophilia - there is no tolerance for this. So if you make allegations, jokes, innuendo or suggestions about child molestation, child pornography, abuse or inappropriate behavior with minors etc. about someone on this board you will get a time out. This is pretty much automatic; this behavior can have real world effect and is not acceptable. Obviously the subject is not banned when discussion of it is apropos, e.g. talking about an item in the news for instance. But allegations or references directed at or about another poster is verboten. 2) Outing people - providing real world identifiable information about users on the forums who prefer to remain anonymous. Yes, some of us post with our real names - not a problem to use them. However many do NOT, and if you find out someone's name keep it to yourself, first or last. This also goes for other identifying information too - employer information etc. You don't need too many pieces of data to figure out who someone really is these days. Depending on severity you might get anything from a scolding to a suspension - so don't do it. I know it can be confusing sometimes for newcomers, as SA has been around almost twenty years and there are some people that throw their real names around and their current Display Name may not match the name they have out in the public. But if in doubt, you don't want to accidentally out some one so use caution, even if it's a personal friend of yours in real life. 3) Posting While Suspended - If you've earned a timeout (these are fairly rare and hard to get), please observe the suspension. If you create a new account (a "Sock Puppet") and return to the forums to post with it before your suspension is up you WILL get more time added to your original suspension and lose your Socks. This behavior may result a permanent ban, since it shows you have zero respect for the few rules we have and the moderating team that is tasked with supporting them. Check the Terms of Service you agreed to; they apply to the individual agreeing, not the account you created, so don't try to Sea Lawyer us if you get caught. Just don't do it. Those are the three that will almost certainly get you into some trouble. IF YOU SEE SOMEONE DO ONE OF THESE THINGS, please do the following: Refrain from quoting the offending text, it makes the thread cleanup a pain in the rear Press the Report button; it is by far the best way to notify Admins as we will get e-mails. Calling out for Admins in the middle of threads, sending us PM's, etc. - there is no guarantee we will get those in a timely fashion. There are multiple Moderators in multiple time zones around the world, and anyone one of us can handle the Report and all of us will be notified about it. But if you PM one Mod directly and he's off line, the problem will get dealt with much more slowly. Other behaviors that you might want to think twice before doing include: Intentionally disrupting threads and discussions repeatedly. Off topic/content free trolling in threads to disrupt dialog Stalking users around the forums with the intent to disrupt content and discussion Repeated posting of overly graphic or scatological porn content. There are plenty web sites for you to get your freak on, don't do it here. And a brief note to Newbies... No, we will not ban people or censor them for dropping F-bombs on you, using foul language, etc. so please don't report it when one of our members gives you a greeting you may find shocking. We do our best not to censor content here and playing swearword police is not in our job descriptions. Sailing Anarchy is more like a bar than a classroom, so handle it like you would meeting someone a little coarse - don't look for the teacher. Thanks.

Rule69

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About Rule69

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  1. Allow me to toss out some ideas that are probably wrong. This may annoy somebody who really knows sufficiently to get them to post a correction. Both PWM and MPPT can work with 36 cell panels. In some conditions MPPT has the potential to get more power out of the panel than PWM. PWM (pulse width modulation) should be able to control a panel with any number of cells. PWM acts like a fast switch that disconnects the panel from the battery for some portion of time as needed to regulate the battery voltage. MPPT (maximum power point tracking) is intended to work where the ideal panel voltage is significantly greater than the battery voltage. MPPT uses a DC-DC converter that tries to keep the panel at its maximum power output (volts x amps) independently from the battery voltage. When the battery becomes full enough that its voltage needs to be regulated the MPPT controller will use PWM to limit the current sent to the battery. Each cell in a solar panel makes around half a volt ideally. A typical 36 cell panel in perfect conditions produces as much power as it can at about 17 volts. A MPPT controller would try to operate that panel at about 17 volts in those ideal conditions. The power output would be 17 volts times whatever amps the panel could produce. A PWM controller would operate at the panel at the battery voltage. The power output would be the battery voltage times the amps the panel produces. When the battery voltage is low and the ideal panel voltage is high MPPT may get significantly more power out of a panel than PWM. In ideal conditions a 28 cell panel's voltage would be around 28 times 0.47volts. That voltage is near the float voltage of many 12 volt batteries. In real world conditions and subtracting the voltage drop of a blocking diode, a 28 cell panel will rarely be able to raise the voltage of a 12 volt battery high enough to damage it (or to fill it completely). So, an external controller isn't required.
  2. Hmmm... At the drop of a hat I can tie a bowline one handed, behind my back, eyes closed while drinking beer. I have to look at the instructions for a diamond knot or button knot (now my fav) if I haven't tied one recently. Maybe I need more practice. I do enjoy making up a batch from time to time. They're nice to have and to give away. Much appreciate the testing and instructions that you and Allen provided.
  3. ^^^ Nice. Even better you can get a newest activity list that excludes PA (or whatever) by unchecking the "unread" status. Awesome find.
  4. Upper right corner of the post, very faint though. Becomes more visible if the post is in focus (eg. you have a cursor in the post somewhere).
  5. +1
  6. Nice. But, as nearly as I can make out there's no way to edit the markup. That's going to make responding to long quotes one section at a time hard. Doing responses inside quotes in different colors gets unreadable fast. I suppose we can cut from the quote and paste into new quotes with the new editor. That's not elegant.
  7. China shock? Anyway, plenty of good batteries come out of China. The Full River AGMs get decent reviews and, AFIK, most or all of the large Lithium Iron Phosphate batteries are Chinese products.
  8. Apparently they're Chinese manufactured AGMs. NTTAWWT. Just that, give or take a bit of optimization, I'd expect them to perform similarly to other lead acid batteries. Mainsail seems to have done some research on them here including the MSDS.
  9. IME, it's the coils that go bad (not often IME, thankfully) I suppose if one had a powerful magnet one could pop off the coil (usually easy) and stick the magnet in its place. That might open the valve. Under threat of raw ramen one might dissect a speaker... No me. I'm fearless in the face of crunchy noodles.
  10. IIRC, those sails demanded a lot of small trimming inputs to work well. It has been ages but I remember giving them constant bumps both to get out of the hole and to maintain speed even when fully powered up. I ~assumed~ the effective flying shape wasn't well represented by the static wing shape. Ie. something magic was going on wrt time. A person with good shoulders can deliver quick, relatively powerful pumps to a windsurfer sized sail. No so much at larger scales with traditional manual power. Maybe ETNZ has an ability to pulse significant power and is looking to make gains with an effect that doesn't show up on traditional steady state analysis?
  11. I suspect they aren't doing one to the exclusion of the other. For any given apparent wind there should be some ideal lift distribution and angle of attack. Tom Speer's paper has been influencing this kind of discussion for a while. He lays out a method for approaching the math.
  12. Practical Sailor?
  13. Got an NMEA 2K interface for all of that? In theory a person could build that. I'd ditch the Arduino and go with a PSoC 5LP. IIRC, you get hardware support for CAN, UARTs (in case you want 0183 connectivity), I2C or whatever the baro needs, and or other stuff and a good ARM core. The dev kit is affordable (similar to Arduino) and has a programmer built in. The trivial task of going from bits to a system are left as an exercise for the reader. Actually, I'd just stick with the perfectly adequate barometers I have. But that doesn't sound very exciting.
  14. Just happened across "Physics Toolbox" for android. It includes a recording barometer. Seems quite nice.