DDW

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About DDW

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  1. DDW

    G10 for chainplates?

    If you thing the Carbon Cutter chainplates where made by cutting up some carbon plate think again. Uni carbon tows are wrapped around the holes, then splayed and bonded to hull and bulkheads. Holes are lined with titanium sleeves. Really not that hard to do on a light daysailer using uni glass, but not as simple as cutting up some G10 plate as a replacement for stainless. The yield for stainless is about the same as G10, but it is a malleable and work hardening material, ending up about 2x the strength of G10 at failure. On many daysailers, you can see this in the distortion of the holes in SS chainplates. G10 (and all composites) rather fail suddenly and without warning. The modest crush resistance of epoxy (< 20Ksi) is why you line the holes with something harder (and, in the case of carbon, the probability of galvanic corrosion).
  2. DDW

    Mainsail halyard lock.

    Harken makes a lock for the 32mm track, but I would not call it low budget.
  3. You could work on it like the builder likely did - with the deck off. There are two uses for a torch in this situation: 1) heat the components which may help to unfreeze them. 2) accidentally drop the lit torch, then call your insurance company. Is that tiller arm really steel? The grease cup too? I realize the Baltic is brackish water, but still.....
  4. DDW

    Non-traveler mainsheet

    The boat is named Anomaly and there have been a few postings in threads over the years. It is a custom, hull designed by Mark Ellis and rig mostly by me, hull built by Jim Betts and interior and finish by Bruckmann yachts. The hull is conventional fin and spade, the rig is a cat yawl with square heads, rotating mainmast. Many of the custom fittings were machined by me, and it's even spawned a sideline business. Another unique feature is the dinghy garage housing the 9' fully rigged Aquapro rib. OK, end of hijack, back to sheets. The mizzen also has twin sheets, again two things to tend but being a small sail you can get to it when you get to it. The ability to trim the mizzen anywhere, even fully aback, has been useful for heaving to, orienting into a swell at anchor, and backing down under sail with complete control.
  5. DDW

    Non-traveler mainsheet

    I've been using a twin mainsheet for years. It is convertible to a 4:1 bridle by opening the sheet stoppers, however we rarely use it that way. Normally the windward sheet is the active and the leeward the lazy sheet, once set up it is self tacking. Running off or coming up requires tending two sheets, but that isn't much burden on a cruising boat. This is a large square head string sail, and with the powerful hydraulic vang I can achieve any sail shape you could with a traveller, just as easily or perhaps more easily. Downwind I have for more control of the shape than I would with a traveller. Jibing can be done under complete control, even with significant pressure. Windward sheeting is no problem (though not done on this boat). The boom can be immobilized in sloppy seas or at anchor.
  6. You could use a cheap latex (water based) interior house paint, which can be power washed off.
  7. This is a perfect application for CNC thread milling. Rather than using a tap, a mill with the correct thread profile is used, and the threads are cut with "helical interpolation" where the spindle circles the perimeter while traveling out of the hole. Threads are cut in one turn and are perfect. You need a multitooth threadmill of the correct pitch, or use a single tooth thread mill and go around the required number of times.
  8. DDW

    Showtime capsize on return trip

    Pics, or it didn't happen.
  9. DDW

    Rapid Disintegration of Saildrive Leg

    A little knowledge can be a dangerous thing. Aluminum anodes are not 6061 alloy or anything commonly listed on such a galvanic chart. Look up the actual galvanic potential of the actual aluminum used on an actual anode. Compared to silver/silver-chloride electrode in seawater, aluminum (Mil-A-24799) is more protective (-1100 mV) than zinc (Mil-A-18001) at -1040 mV. Despite today's political climate, there is actually such a thing as objective, testable fact.
  10. DDW

    Sailing log book

    Personally I like the Dale Nouse Logbook, it is well organized for what I want to record without fluff. I am moving to this one however, which records so much more, with so much less effort.
  11. DDW

    Flir selling Raymarine

    Trouble is, if Raymarine goes Tango Uniform, you are left with Garmin, Navico, and Furuno. Which makes the generic hardware running Linux and open source software pretty attractive.
  12. DDW

    Flir selling Raymarine

    https://www.ibinews.com/mergers-acquisitions-and-exits/flir-to-sell-off-raymarine/35798.article Probably not a good thing for Raymarine. Too bad, because post Flir acquisition they are producing some nice product.
  13. DDW

    EFI versus Carb for fuel economy. 20 HP outboard

    I doubt it has a restrictor plate - this is an EFI engine, and the derating can be accomplished with firmware. And no doubt is, otherwise you would simply buy the 20 and remove the restrictor plate. This is what Suzuki does, and to make the upgrade you simply have to buy the ECU from the other engine - which is priced at more than the difference in engines. These people weren't born yesterday! The injection map on the 25 is probably different throughout the range (I think these are mapped systems? or do they have a mass flow sensor?). So overpropping the 20 may result in an improper mixture at reduced power vs the 25. If they have a mass flow sensor then it probably makes no difference.
  14. DDW

    Some Assembly Required...

    MDF is a slightly higher quality product than crumb board. Wafer board, crumb board, MFD, HDF. Still in the category that I call "Would-Be-Wood". That is, it would be wood, if it weren't something else. I agree on the packaging problem, but add to it: some of these things are frustratingly difficult and time consuming to unpack and unwrap, more time spent there that assembling. Example is something like a drill bit packaged in a large, bulletproof, heat sealed plastic bubble pack that requires industrial power shears to penetrate. I realize that this is done more to protect against theft by the unwashed masses than to protect the bit, still it is a great annoyance. In furniture and the like from China, there is the added problem that the cardboard is itself Chinese quality: limp, weak, floppy, and smelly - useless for any second purpose one might have.
  15. DDW

    Full batten main with swept spreaders?

    This is actually why yawls were invented. Keeping the head up while doing sail handling or deck work. That and the ability to back up under complete control.