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About MikeJohns

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  1. Here's a Swedish couple's trip around the Atlantic loop. Fixing things in exotic places and having fun. It's in Swedish with an attempt at subtitles but you get the gist: http://sailingannemon.com/youtube-videos/
  2. Sure.... obviously it's a GPS personal Epirb required for an effective MOB device . They are around $350 here from the retailers. I note that it has to be registered, always should be anyway. Amsa here had indicated previously that even unregistered with but with correct country code registration was routed to them.
  3. That's changed a lot over the decade or two, there are now geostationary receivers that cover close to 90% of the planet. Satellite Response is now practically instant outside of the polar regions. Crew should be briefed to only activate their personal epirb when its clear visual contact has been lost. An emergency call center will respond with the beacon LatLon as well as working with you until rescue is accomplished. Even if it's an unregistered beacon. Then not only the calling vessel but other craft and aircraft will be coordinated externally regardless. Consider a dis
  4. The Bavaria 47 "Essence" sank off NZ in a gale in 2019. A wave broke over her and literally squished the hull and popped the glued windows out. The liferaft, dinghy and ships epirb also went west along with the windows. They got off the boat into the water as she went down after about 15 mins. One of the crew had a personal Epirb attached to his life jacket and it saved most of them after treading water a few hours, one died 3 survived. They were located by a NZ airforce Orion and dropped a liferaft. So close to a total loss with all hands. You can get the lat-lon of the epirb from
  5. For sea water contact there's hardly any significant difference between 316 and 316L for both crevice corrosion and corrosion fatigue except where larger sections are welded, then granular effects from carbide precipitation is reduced with lower carbon content, and that encourages chloride related crevice corrosion. There's a lot of of confusing information around regarding 316L. 316 Keel bolts are at high risk if they can get wet. There's not only the risk of crevice corrosion but also a much lower S-N curve for fatigue cycles to failure if the surface is wet. Duplex SS is much bett
  6. Rest easy: Seppo is the Strine version of Septic. The term Septic for "Yanks" is actually cockney rhyming slang and was common in tv programs aired here circa 1970-80's that were sourced from the UK. Hardly ever heard these days, and most of the under 40's would have no idea what it referred to. Cockney Insults https://grammar.yourdictionary.com/slang/cockney-insults.html
  7. In sand the Rocna is terrific and sets so easily after using CQR type plows, they take some effort setting at times. But in some cohesive bottoms the Rocna can foul, doesn't dig in past the initial set, and under load shears out a large gob of the bottom and that remains wedged in the anchor preventing resetting. It's happened to me twice with a Rocna, then the boat heads off downwind fast and the anchor does not reset. Both times it was an exposed anchorage to wind, and gusting over 30 knots . Initial set was good, scope over 5:1 using chain. The last time it happened we were
  8. Coastwatch has been flying over southern coastal waters lately, low and obvious......... Usually we only see them once every few years in Tas.
  9. If the water is warm and the club actually caters for dinghies it works. Here I’ve seen dinghies regularly put newbies off sailing, both kids teens and adults. It’s a path for a competent sailor but it’s not the only path. A well mannered forgiving keelboat design has been the start of many of the sailors around here. Both racing and cruising.
  10. She’s a flamboyant, flirtatious, ditzy character and was flouncing around here for a while looking for a boat to get North on, and that was it. Neither of the people, nor the boat were "offshore capable". The skipper was a boat buyer from NSW returning North with his newly purchased old boat. The skipper thought she was an experienced hand and she thought he was……What could possibly go wrong ! It's not unusual to see inexperienced, unprepared people’s trips turn into a farce if they don’t have any ability.They kept rescue services on standby and were eventually collected in t
  11. I use Android based phones and I've been using the sensors for a while for data logging, validated/adjusted against some large expensive calibrated instruments we used to clamp on. I've been using logging apps such as the "Physics toolbox suite". These modern phones/computers are very capable data loggers once you work out their limitations.
  12. The safe continual Working Load Limit is around 10% stretch for Nylon while breaking is around 40% stretch. The energy absorbed is proportional to the extension squared but only directly related to the k value of the spring. So you want more stretch in thinner rope rather than less stretch in thicker rope. For best shock absorbing in the situation, it should stretch close to the working limit. Usually snubbers are way over size for their length for optimal use. It's best to leave the 10% extension limit as the slack in the chain and then watch the bight to see how much it straightens
  13. I use a hitch that the German's call a KreuzKlemmKnot often called a Heddon Hitch. Its simpler than the Klemheist and comes undone easily. The pull is inline with the loop so you wrap your sling around the chain or rope towards you and only two wraps, very simple to teach to newbie crew. Works well on chain, enough friction to keep it in place and much easier to undo than a Prusik knot.
  14. Funny for a bright individual that he didn't foresee this or actually ask the port what was required. Usually the insurance will demand professional involvement to indemnify them in turn, and then it will be back home. Stability can be determined from the lines and an inclining test later. But structurally it doesn't meet any standard for other than very limited use. With his high level of publicity he might find someone who will sign off on just putting it in the river, but if he wants full comprehensive insurance ithey are going to want to see that he at least followed a design an
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