Kiwanda

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Everything posted by Kiwanda

  1. Kiwanda

    My newest project

    It appears he is pretending the victim hence his attempted modesty. Come to think about it - maybe it is not an attempt at modesty - more likely he has much to be modest about
  2. Kiwanda

    My newest project

    Thank you.
  3. Kiwanda

    My newest project

    Is a date and (travel lift) location set? If so where can one obtain permission to attend? Kiwanda
  4. Kiwanda

    My newest project

    Other people have not had the same experience. Photo by Ed Sherman
  5. Kiwanda

    My newest project

    Mr. Hart Your anode depletion rate seems pretty normal. Doubtful there is any wiring or stray currrent based gremins afoot based on what you report. 50% wasted salt water is the right time to change out and if the anode lasted longer than one year the anode is probably passivated or loose (not working) and needs to be replaced. If your drive is Volvo then the drive is already isolated from the motor and so also the rest of the boat. Check it with a multimeter. If it does not check out diagnose and replace the Volvo insulated parts that were put there to maintain isolation. Generally: Keep the drive paint coatings intact - any scratches need to be recoated. The sail drive anode is sized to protect the drive itself - not the propeller (nor any other underwater metal either) so aftermarket propeller means additional anodes need to be in place. No wiring attached to the drive either - including a control cable that might come into contact other things electrical.
  6. Kiwanda

    My newest project

    An isolation transformer will keep you isolated from the neighbors galvanic and stray current mischief because safety green does not pass off the boat and so you are not connected to everyone else. Safety green still needs to be bonded onboard but that path ends at the transformer. This device also does away with polarity miswire threats and eliminates AC passing through the water to the shorepower transformer ground. Very good device indeed but one needs to make sure the install is exactly as designed and one needs to test regularly to be sure there are no internal faults that will defeat isloation. An isolation transformer will not protect you from stray current or galvanic events if the source is on your own boat.
  7. Kiwanda

    My newest project

    If DC stray current is the cause of anode or underwater metal wasting then there is a problem with DC wiring or a DC device - not the DC/AC safety green bonding connection. If you need 24 hour circuits (bilge pumps, refrigeration, etc.) then complete battery isolation (both DC positive and negative switch) will not work. LIkewise this connection plays no part in anode depletion if the source of stray current is a neighbor's DC electrical problem . Typical sources of stray current are the battery charger, charger/inverter, any device or wiring connection exposed to bilge water. In the case of inverters and generators too - AC safety green (grounding) to DC negative are bonded together for safety the same as AC shore power safety green needs to be bonded to DC negative. AC grounding does not carry any current unless something goes wrong between AC and DC system wiring. If the two are not connected together then there is no secondary path back to the AC source. Plainly - defeating that connection puts the boat and persons at risk and where these are correctly bonded together there is no risk of creating any DC stray current threat. The AC/DC connection is an important safety connection that protects from fire and electrical shock. And that is why virtually every code worldwide including USCG and ABYC standards require this connection be kept intact. The connection by itself has no effect whatsoever in stray current damage cases.
  8. Kiwanda

    My newest project

    Yes -- Dave and anyone else too. Please note well anodes protecting the sail drive unit must be carefully attended --- and that goes double if you use any propeller (Gori included;) containing copper. Else problems will ensue. Follow your version of sail drive instructions (probably Volvo in your case) to the letter especially concerning aftermarket propeller installs. If you do not attend to this detail galvanic trouble will attack the drive unit big time and you will much regret your inattention. Kiwanda
  9. Kiwanda

    My newest project

    Gotta respect the vacuum cleaner reverse oxygen forge supplier. Brilliant
  10. Kiwanda

    My newest project

    I had proclivities once too. Fortunately they got scared out of me - I think at the same time as the beejeebers. Happy New Year Bob Perry and to the rest of you as well. Hope Boomer and you can conspire to chronicle Dave's build.
  11. Kiwanda

    My newest project

    Perfect boat for me. Want to talk? Kiwanda
  12. Kiwanda

    My newest project

    Tall race cars
  13. Kiwanda

    My newest project

    Message received no prying into secrets was intended. One would not expect polyester - except polyester can be pretty whiz bang in the right recipe and it is a dream to sand and shape. Carry on Kiwanda Edit I know right where the yard is - so is it really possible to obtain an appointment? Personal note -- would love to discuss take apart (nesting) dingy in CF.
  14. Kiwanda

    My newest project

    One cannot help but admire good BOG (Carumba and I discussed BOG generally at your June get-together). Do you know what the recipe is in the case of the bulwark here? Kiwanda
  15. Kiwanda

    My newest project

    Can bring generator if it keeps the information coming. Kiwanda
  16. Kiwanda

    Anchor Geekdom

    Well if you think I could be of some help just call I will show up. Fair to good fitter I am - some say gifted - but maybe not so good the aluminum welding part. Kiwanda
  17. Kiwanda

    My newest project

    Bob Keeping the bulkhead separation low - instead of full height as designed - ended up making the interior very smart. Kiwanda
  18. Kiwanda

    Perry Sliver Class Day Sailor

    The neighborhood has changed immensely in the 25 years I've lived in Seattle, the last 10 in Ballard proper, but Old Ballard's not going down without a fight. There's still a huge Norwegian Constitution Day parade every 17th of May and the Nordic Heritage Museum just broke ground on a new site that's a full city block in size. Uff da!We lived in Ballard just up the hill from Bob and Jill. Just before we moved to Spokane (in 2010) (and a few years after Bob moved to The Shack), I was walking our new Westie down by Bob's old house, and someone in the neighborhood thought we were casing the neighborhood. By the time SPD arrived, I was talking to Jim, who had been there 30 years or so, and the cop says 'hey Jim, hey Paul, who's casing the neighborhood?' Jim points at me and we had a good laugh. Apparently the (new) neighbor who called me in was very upset about this, as I wasn't dressed well enough (in Ballard?). She revealed herself more fully at the yearly association beach picnic, getting on our cases for being there. We were members for almost 20 years. New Yorkers. He was a Master of the Universe, she the 2nd trophy wife. Not Scandinavians. A little nervous laughter, I tink so, ja. Sad to say, glad we're gone. The place makes my stomach a wee tight these days... We very much enjoyed living in Ballard, but we moved to Blakely Harbor in 1997 and missed all of these new changes, which might be a good thing. Uff da
  19. Kiwanda

    Dave's perfect sailboat

    True for sure. Guess I have gotten used to limiting alternator time and the fact AGM like to see 30% or so I am told by Lifeline engineers
  20. Kiwanda

    Dave's perfect sailboat

    Damn - 90 amp/hr alt and 1000 amp/hr C/20 battery bank? Gutsy! Probably works cause your bank is no longer 1K. Kiwanda
  21. Kiwanda

    My newest project

    Bob I there a launch date and location for the first of these? Kiwanda
  22. Kiwanda

    Dave's perfect sailboat

    The 6v batteries weigh 119# each. I have a 60 gallon fuel tank. I will have a 48v battery charger on shore power. So I plan to always be leaving the dock with a full charge. How fast the batteries will accept a charge is the big question and I am going to be talking to Lifeline about that in the near future. If you are after lead acid chemistry consider Firefly in your planning. Much deeper discharge - maybe down to 20% of C/20 and very tolerant of deep discharges. I do not know if they make suitable battery with physical size and large enough capacity. Their website also has an article concerning electric propulsion refit. Lifeline wants very high amp rates for recharge and they prefer relatively shallow discharge depths - never more than 50%. This is a guess but expect probably 5 plus hours of charge time from 50% to 100% for Lifelines. Lifeline will explain how much generator/charger you are going to need to keep the batteries in top shape and obtain the shortest charge times. Don't overlook lithium iron either.
  23. Kiwanda

    Dave's perfect sailboat

    To further the comparison - At 133# per battery I make that 1330# for the 10 - about the same as 190 gallons of diesel. I think Dave said the motor is expected to be 48 v. so the bank would be 8 units which is about the same weight as 150 gallons of diesel. If he used diesel propulsion and burned 1 gallon per hour his range would be a bit under 150 hours. Considering where Dave will be using the boat that is probably enough for an entire summer of cruising. While the idea is to eliminate noise smell and so forth there will be no escape from a certain amount of diesel equipment annoyance when cruising. Dave will need to run a generator in order to keep the battery bank charged and will probably not get the batteries from 50% state of charge to 80% charged in less than 2 hours of generator run time. Many more hours than that would be needed to obtain a fully charged bank. So in the real world - when out cruising - Dave will have about 30% of total battery label capacity actually usable. And he will need a pretty skookum whiz bang diesel generator to keep up.
  24. Kiwanda

    Dave's perfect sailboat

    Their solution was an explosion proof containment box. In the boat case the battery chemistry is lithium iron phosphate - quite different from the Boeing version. Hence no explosion proof box required.
  25. Kiwanda

    My newest project

    The copper will protect the fasteners/screws if the fasteners are the more noble of the pair. For example, if the fasteners were iron they would corrode away and the copper plate would become 'unfastened.' The fasteners here are not iron but something more noble thus they will outlast the copper. The rule is to use more noble material for the fasteners. The surface area of the fasteners is very small in relation to the surface area of the copper plate thus the copper corrodes very slowly while it is protecting the fasteners from galvanic corrosion. As to the galvanic interplay between the hull and the copper - I assume they are electrically isolated from each other because if not and and both are exposed to seawater the copper would waste away swiftly. If that is not possible perhaps the design includes consideration of impressed current system and/or zinc anodes. In all events I am sure they will measure/monitor the hull potentials after the boat is in the water to assure the underwater metals are protected from galvanic threats. As far as harbor electrical pollution is concerned it is possible the design calls for an isolation transformer and if so any harbor (electrical) pollution source would have a very limited effect on underwater metals.