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2airishuman

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About 2airishuman

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    Minneapolis area
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    Sailing, SCUBA, music performance, aviation, mountains

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  1. I have lived in rural and off-grid locations at various times in my life, and have several friends who were veterans of the Peace Corps in the 1980s who lived for years in remote areas with no refrigeration. Alan T. Hagan's "Prudent Food Storage FAQ" is one of the most comprehensive guides and dates from the UseNet era. Available at http://www.ccrettraining.org/wp-content/uploads/2019/03/Food-Storage-FAQ-v4.pdf for free, 124 pages, worth reading every word if you are serious. It has a list of sources and references for further reading. I exchanged some correspondence with Hagan back i
  2. Um, we talking about boom brakes or boom breaks? Boom brakes are a good thing.
  3. Why are we supposed to hate mid-boom sheeting? It seems kinda nice to get the sheet and the traveler out of the cockpit, and better distributes the sheeting loads along the boom. Not only that, it keeps the sheet inboard of the gunwales so it stays out of the way when docking under sail.
  4. I see, Slug. So this is just about keeping the flogging halyard from making the sail flog -- the halyard is still free to flog above the head pennant but the car keeps the motion from being transferred to the sail.
  5. Some boats have a fuel locker; if yours doesn't the alternatives are either: an unenclosed location above decks in a location where vapor does not drain into the cabin. Fuel will get hot and deteriorate quickly a permanently installed below-decks tank with an overboard vent and fill. You will need a bilge blower. Expensive a fuel tank integrated into the outboard motor (available for 6hp and less). Worth considering if 6hp is enough especially if you don't motor long distances. Typically these hold about 45 minutes worth of fuel at WFO. various safety compromises
  6. Ardiuno Raspberry Pi - though this is debated NanoVNA Nitrokey These are just the ones I actually have. There are plenty of others. Wikipedia has a list at https://en.wikipedia.org/wiki/List_of_open-source_hardware_projects Some are more successful than others. Some people think open source hardware is a stupid idea promulgated by kooks. Many of these people thought that GCC was a stupid idea and that Richard Stallman was a kook. GCC is arguably the first and most pivotal open-source software project; its success changed the world. NanoVNA and Arduino have deriva
  7. For clarity, it's the SD cards I've had trouble with. Real SSDs work ok unless defective, and we've had trouble with that, and not just on pis. Onlogic.com makes some nice PCs designed for embedded control. Similar functionality to the pi only without the I/O pins, but in a really good fanless enclosure and designed for reliability. Roughly the same size. They are comparatively expensive but if I were going to run OpenCPN on a boat using a permanently mounted display that is what I would use. We've had really good luck with them at work except for the defective ssds that come with the
  8. The fluxgate compass is part of the 9-axis ins chip that is in the hat for the pi. The pi must therefore be mounted away from magnetic interference. That is the reason the motor controller is separate, since the currents involved will produce enough magnetic flux to affect the compass.
  9. It depends on sea state, point of sail, and your expectations of the ap. On a reach on a nice day your 1 hz will work great. On a run in heavy seas and winds 100 hz might be better than 10 hz. A well designed ap algorithm looks at the first and second derivative of the ins data which means a series of recent points are required. A well designed ap algorithm will belay previous orders to the rudder drive more aggressively than it will usually steer which requires accurate and timely rudder position data. SSDs are the achilles' heel of the pi. The pi will exhaust their write life,
  10. Right. I believe it reduces the gain, resulting in less runtime for the motor.
  11. A potentiometer. If memory serves 20k ohms is recommended. ::shrug:: Pypilot can't deal with rudder sensors that emit NMEA0183 or NMEA2000. I don't think that's necessarily the end of the world. The pypilot approach is that there is a rudder control subsystem made up of the drive motor and associated gearing or hydraulics, the motor controller, and the rudder sensor. I don't think that's unreasonable. Sean has figured out how to integrate a 9 axis compass/gyro/accelerometer, a motor controller, and a rudder position sensor together to make an ap. And he's don
  12. That is the story and I believe that it is probably 99% pure, unadulterated Bunkum. You can't use the NMEA2000 logo or call your product NMEA2000 approved or compliant or whatever without permission from NMEA but there is ample precedent that you can say factual things like "compatible with most chartplotters that support NMEA2000 signalling" etc. You can't get the official documentation but there's nothing unlawful about reverse engineering the protocol in order to achieve compatibility. It's not encrypted. I think the real reason it isn't widely supported by the open source community
  13. I was thinking about this for the last few days before I saw your post because I was thinking about using pypilot on my next boat and was pondering the deficiencies of the documentation, enclosures, and overall integration/packaging of what could be an extraordinarily successful solution. And yes, the lack of a clearly defined integrated system that has been tested together is a major frustration. (Though I will note that for pypilot in particular, its author (Sean) has tried to address this by packaging and selling the major components himself) The trad marine electronics vendors do a
  14. Good call. As of today you can get a new Standard Horizon GX1400 with similar features for $120 at Defender, new unit with a warranty. At those sorts of prices it isn't worth screwing around with a repair on an older unit unless you're doing it for the experience or are one of those people who develops a personal relationship with your radio.
  15. OK, my mistake, the exemptions are in another section of the statute. https://law.justia.com/codes/alabama/2016/title-33/chapter-5/article-2/section-33-5-52/
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