• Announcements

    • Zapata

      Abbreviated rules   07/28/2017

      Underdawg did an excellent job of explaining the rules.  Here's the simplified version: Don't insinuate Pedo.  Warning and or timeout for a first offense.  PermaFlick for any subsequent offenses Don't out members.  See above for penalties.  Caveat:  if you have ever used your own real name or personal information here on the forums since, like, ever - it doesn't count and you are fair game. If you see spam posts, report it to the mods.  We do not hang out in every thread 24/7 If you see any of the above, report it to the mods by hitting the Report button in the offending post.   We do not take action for foul language, off-subject content, or abusive behavior unless it escalates to persistent stalking.  There may be times that we might warn someone or flick someone for something particularly egregious.  There is no standard, we will know it when we see it.  If you continually report things that do not fall into rules #1 or 2 above, you may very well get a timeout yourself for annoying the Mods with repeated whining.  Use your best judgement. Warnings, timeouts, suspensions and flicks are arbitrary and capricious.  Deal with it.  Welcome to anarchy.   If you are a newbie, there are unwritten rules to adhere to.  They will be explained to you soon enough.  


  • Content count

  • Joined

  • Last visited

About valis

Profile Information

  • Location
    Friday Harbor, WA

Recent Profile Visitors

7,686 profile views
  1. Thanks all for the info. My next question is about ablative vs hard paint. As I mentioned, I was less than impressed with the midrange ablative on my powerboat. The Trinidad SR on the sailboat has much less growth without cleaning (or much use lately). So is the difference ablative vs hard, or is it the much higher copper content of the Trinidad? It's going to be a bigger job to put the hard paint on the powerboat, since we have to remove virtually all the ablative from the hull, so I might be satisfied with a *good* ablative. Still, being able to (for now) dive on the hard paint may make it worthwhile to change over regardless. I'm not going to worry about 2020 until it gets here. I want the best I can legally use now.
  2. Jim and Kris, those foggy photos are beautiful.
  3. Correct me if I'm wrong, but I believe the current situation in WA state is that you can still hire a diver to clean the bottom as long as you have a hard (non-ablative) paint. If you have ablative, the owner can still dive and clean their own boat, but can't hire a pro for the job. I'm interested in this because I'm about to haul and repaint my little powerboat. It has a mid-range ablative paint now, and I'm not impressed with the performance when I compare it to the Trinidad SR I have on my sailboat. I plan to have the yard take off the old paint down to the gelcoat and use Trinidad. I wouldn't mind being able to have someone dive on the boat regularly, which I was the arrangement when I used to be in Sausalito. So what's the situation now, and how / when is it going to change?
  4. Yeah, but the criticism was claiming that she was over-ballasted and would necessarily float deep when trimmed. Thus Bob had to add negative ballast. It's kind of like those airplane design reviews, where the comment on the blueprint says "Add lightness here." All stupidity aside, it's a beautiful boat.
  5. Could the Hawaii GPS dropouts be related to Navy exercises in the area? I've heard announcements of scheduled GPS disruption before the large exercises. I've never noticed it myself though, and don't know how wide of an area was affected. As far as tablets for chartplotter replacements, I would really want to have a fairly splashproof power connection. I sometimes keep the cockpit chartplotter powered up 24/7 for a couple of weeks. Other times I just turn it off, but having 24/7 power is an issue for me.
  6. Bob, there you go spoiling everybody's fun! On her lines? Riiiight. I bet you stuffed the cabin with helium balloons.
  7. What's the aft bridgedeck clearance on that condomaran? It looks like about 6". Or is it a cat in front and a mono in back?
  8. No offense meant, but to my eye that hump just looks wrong. On either boat. Not my cup of tea, I suppose...
  9. But this is a good thing, right? It means you aren't engine-charging so much. OK, I suppose that was your point...
  10. I never said it would be a good idea! But wouldn't the energy be double that since we can extract energy from both the rise and the fall? And even more than that since on the rise we can "push" against the substantial positive flotation. But even it it's 2kW, that's the same daily power production as 400W of solar panel, at perhaps only 100X the price (if I could figure out how to build the thing.) But I bet I could launch a kickstarter project and get lots of fawning press coverage if I tried. People want to believe...
  11. Meaning wave and current and tide energy? I've often wondered about somehow connecting a generator to my floating dock, which the tide raises and lowers twice a day, up to 12 ft range. Speed of the rise / fall is an issue, and I hope I wouldn't need some secondary mechanical energy storage mechanism before I could convert the energy to electricity. OK, how much does my dock weigh? I need to crunch some numbers.
  12. Shouldn't you say "a very inefficient battery"? Modern electrolysis is only about 60% efficient when comparing the energy used to convert water to hydrogen and pressurize it for storage, to the thermal energy of the hydrogen produced. But I guess the question is "efficient compared to what?" I don't know the refining efficiency for diesel fuel, solar panel conversion is about 20%, windpower conversion is theoretically limited to under 60%, etc. But I'm mixing conversion efficiency with storage efficiency. Using hydrogen as an "energy battery" doesn't seem very efficient. I suppose if the conversion energy is cheap (your off-peak electricity), then using that to convert water to hydrogen may be better than the other alternatives.
  13. True, but I suggest that this isn't a particularly useful way to look at it. Take it back far enough and we have to consider the stored energy density of the big bang monobloc. I don't think I'd be very comfortable carrying one of those on my boat! And recharging it would be a bitch.
  14. Mike, is there any way to make the hydrogen that doesn't consume more power than it provides, or at least has no more loss than using electricity to charge a battery? Sure, hydrogen burns clean, and it has a pretty good energy density, but until we get clean electric power aren't we just moving the pollution from one place to another? And capacitors? Current technology gives about 50 Wh/liter stored energy density. Compare that to 10,000 Wh/liter for diesel fuel. Is there any realistic possibility that the capacitor energy density can be improved 200X? Or even 20X? At some point, the cost savings of paying for recharge electricity (vs burning diesel fuel) will tip the scale, but you need a way to store that power. Capacitors are even worse than the best batteries in terms of energy density, although the charge/discharge efficiency and cycle limits do help this equation. And the best batteries are still not good enough for this application. So what breakthroughs are needed, and what can we anticipate?
  15. On windless days like that in the Pacific Cup, I think that we would go faster if we shrimped the kite and let the current pull us towards Hawaii. Windless races can be interesting. On one Three Bridge Fiasco the wind died after we crossed the start line and were heading for the Blackaller buoy mark (near the south tower of the Golden Gate Bridge). There was a building flood current, so we dropped the anchor and had lunch. We "passed" quite a few boats while we were eating. We've also spent a day or two bobbing around near the Farallon Islands after the start of a Pacific Cup. Even if we're drifting backwards or sideways, we at least try to keep the bow pointed at Hawaii, if only for the sake of morale. We got to see a lot of marine life, including whales spyhopping and checking us out, and being charged by a small pod of whales (who dove under the keel at the last moment). The swells can be pretty sloppy and a lot of boats suffer rig damage from the boom, etc, slatting around. Smart people drop the sails in those conditions, but we racers take whatever microscopic fraction of a knot we can get.