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About estarzinger

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  1. estarzinger

    Chain Splice v. Thimble and Shackle

    agreed - don't "need" to . . . . but it seemed to help (minimize last link rust) and was easy so I did it.
  2. estarzinger

    Chain Splice v. Thimble and Shackle

    yea, but there are things you can do to minimize with the direct splice . . . like double (or triple) coat the last link with epoxy primer (ofc make sure it is nice and clean before painting) before making the splice. I've always used epoxy, but other coatings might possibly be good (like rubber or plastic dip) . . . or there are more sophisticated (and MUCH more expensive) hard finishes. The epoxy will not last forever (painted distance markers on chain need to be renewed every year or two or three - depending on use and conditions) but does seem to last and protect quite well under the splice. This will not work as well with the thimble/shackle, because the metal to metal will knock off the coating pretty quickly.
  3. estarzinger

    Suggestions for MF/HF Radio

    This is incorrect - in two ways: Iridium provides 100% coverage, including right at the N and S pole. AND HF/SSB radio starts to have sporadic propagation issues at higher latitudes affected by geomagnetic and ionospheric conditions. So, In fact, vessels heading thru the NWP who want reliable gribs will install iridium, even if they 'normally' use hf/ssb. But in addition, this 'above 70 degrees' issue is also mostly irrelevant for 99.99% of cruisers.
  4. estarzinger

    Diesel engine cold start - air intake preheater thoughts?

    three options i don't think have been mentioned yet: (1) heat up the motor oil on the stovetop (I suppose you could also warm the coolant the same way but I have only seen the oil done), (2) slide a small camp stove under the engine and let it heat things up for a bit. I'm not particularly recommending either . . but have seen them used/work. Hawk's yanmar never needed any special technique/equipment - just the right oil, fuel, strong batteries and good maintenance and she always started - from S Georgia to iceland . . . . and even in greenland when I was solo and not running any sort of cabin heater at all.
  5. estarzinger

    Heavy duty sewing machine

    i tend to avoid theorizing because I was wrong and surprised so many times when I started getting actual test data. But I believe when comparing an open sling (eg the middle and the join NOT sewn together) to two end loops - the first order effect would be at the same total load, the highest loaded stitches will take (roughly) 1/4 the load with the sling vs with the two end loops - because the sewn section takes 1/2 load to start (as the other half of sling takes 1/2) and then the end to end joins loads two ends of the stitching while the end loop only loads one end. There may (not sure) also be a (more complicated) favorable second order effect - inside the two ends first rows of stitching, and which could well depend on the specific stitching pattern - but some research would be needed to explore that. For instance, with an odd number of bar tacks, the bar at the dead center of the pattern should take even loading from both ends (while with even number of bars, all the bars are more side loaded). Climbing slings seem to be generally built with odd number of tacks. And it would seem (from test data) that a 'closed' sling (eg where the end to end is sewn 3 ply to the other side of the sling, may further spread the stitching load. I think I am basically agreeing with you . . but not sure . . and I am reaching here with quite limited data. Actually looking into it might reveal surprises. IDK - while the details of the stitch loads would be interesting to understand in better detail, all we really need to know is "sling better than end loops" and 'bar tacks good' ------------------------------------------------------------- I was happy to see the mars rover para deployment/landing go flawlessly - the whole deployment process was decently complicated and was a pretty highly engineered system, every fraction of a gram was critical. The Mars team has always seemed pretty (exceptionally) solid. Technora and Ti in the bridle, riser, shrouds.
  6. estarzinger

    Heavy duty sewing machine

    I know what the specs say . . . but have you tried V-138 . . . mine will run it with some adjustment . . but max v92 seems good for like 99% of stuff
  7. estarzinger

    Heavy duty sewing machine

    ^^ Thanks . . . yea. I was wondering/guessing that you could program it to make your own custom stitch pattern, but that you needed to go quite far down the rabbit hole to figure out how. I presume it can use v92 thread?
  8. estarzinger

    A knot puzzle for the day

    there are several alternate ways you could terminate the ends, so that you could access the ends, or remove the system at will. The most obvious would be to put splices loops in the ends of the lazy jack lines and then a light lashing from that loop to the cleat. . . . that lashing would also allow you the ability to set/adjust the length anytime it became necessary.
  9. estarzinger

    A knot puzzle for the day

    I'm also puzzled by the description. But taking it at face value . . . . you cut at the knot and splice in a short section just the right length . . . its single braid I guess, so end to end splices are dead simple and pretty clean and 100% strength.
  10. estarzinger

    Heavy duty sewing machine

    ^^ thanks, yea most of the computer-controlled home machines have something they call a 'bar tack' in the buttonhole function . . . . but the samples I have seen look more like 'close zigzag' rather than load-bearing bar tacks . . . . so I was curious what that beast mentioned above had available. I looked in its manual and it has the normal buttonhole option but it has so very many options it might have a more true bar-tack somewhere. There are certainly a whole bunch of special-purpose industrial bar tack machines, and Brother makes some good ones . . . .but for my limited purposes that seems a bit overkill. It is not any priority but I have just been keeping my eye out for a way to improve my bar tacks without going the special-purpose machine route. And . . . yea I took down all my web testing material years ago . . . . . I had too many people misunderstanding and/or misusing the information - made me nervous, and a few of them got angry at me when I tried to correct them (including a couple of magazines that misrepresented the work/results). It just ended up not being 'fun' for me to have the material posted. I mostly 'play' with people doing heavy (industrial) lifting today.
  11. estarzinger

    Heavy duty sewing machine

    lol - thanks but (most people here know) I'm actually the 'Evans' who did that work I do know just a little about this.
  12. estarzinger

    Combo PFD/Harness?

    ^^ Yes, exact. While we are on harness/crotch strap/tether fails . . . just a reminder on those stamped sheet metal hooks - report - this one just happened to be a spinlock but probably would have been the same with the other common brands using the sheet metal design. Like with plastic buckles, this had no place in a life-safety load bearing application. Would have been laughed out of a climbing application.
  13. estarzinger

    Combo PFD/Harness?

    This is not correct. Those spinlock lock vests actually failed. The flotation chambers pulled up and away from the vests in a way that was never intended. report - note the recommendation on page 11: "The panel recommends that Spinlock and other manufacturers examine the design of their inflating vests and consider making the inflation chamber more secure to the harness." I might note . . . in other incidents there have been failures of the spinlock crotch straps . . . see the lion report for example: the plastic para-buckles meet the minimum spec, which is simply to hold hold the flotation of the vest, but could not support 'towing or lifting' the mob, and failed in testing at significantly below what spinlocks specs indicated