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About kiwichas

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    Dinghies, small keeboats

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  1. kiwichas

    Caption Contest

    Dick of the Week??
  2. kiwichas

    Modeling Drag from (Displacement) Polars?

    I understand completely In 24.9 knots of wind I can do 381.18 knots upwind
  3. kiwichas


    Nice boat, had it long??
  4. kiwichas

    you're not helping!

    Gybing, one, two, three Go!!!
  5. kiwichas

    Hello Stress Engineers

    ADD= Attention Deficit Disorder
  6. Absolutely; within a mixed fleet you'll identify the boats close to you in performance and try to improve(thrash) each time, and still have a ton of fun.
  7. One design racing is the best way to develop skills, handicap systems are for the wealthy who can't sail, or are overly obsessed with "winning" Just rememember that all participants are winners(except for those who live in/for protest rooms... PS best way to sail upwind is to do it in only one tack, you lose too much time in tacking.....and it tires out the crew and wrecks the sails
  8. kiwichas

    caption contest

    This sucks Beavis
  9. kiwichas

    Trying to Buy a Boat

    Run don't walk
  10. kiwichas

    Oyster Yachts gone bust

    "loosing" or losing their jobs?? Surely....
  11. kiwichas

    Vendee Globe 2016?

    Forecast 35-45kts NW Sea becoming high Survivable??
  12. kiwichas

    Vendee Globe 2016?

    5 entrants now crippled by hitting stuff, and the race is not over yet The idea of hurtling along blind on autopilot does not seem seamanlike to me.
  13. kiwichas

    Cheeki Rafiki MAIB report published

    I don't know that you can tell much about ovalisation from the photos.It does look as though the rear bolt had failed previously, oddly. The 18mm bit I had not read, and I would think that if this abuts a mere 7.7mm fore and aft of the hollow "floors" of the liner you have points that can flex and delaminate at that point, where the fore and aft lateral stiffeners are, that is where it will fail. I wonder if there are any specified torque settings for the bolts; if overtightened just to make sure that could be catastrophic under repeated stress. We have a generation of much faster boats with deeper thinner vertical(not raked as in the past)keels that are hitting rocks more often,and rather than blaming the skipper or the repairman or the insurance company(that does not want to write the boat off) we need better engineering, to feed the loads into a much greater area, so that the energy of the collision is dissipated by bow depression rather than irreparable internal damage
  14. kiwichas

    Cheeki Rafiki MAIB report published

    The keel is bolted through the hull laminate only in this design. This means under stress the whole keel area can flex, uprooting it from the hull liner/stiffener; when this happens more flexion occurs and there are only so many more cycles left till total laminate +- keelbolt failure. Stresses are greater on modern boats because of narrow deep keels, and the fact that you are quite likely to "hit" at 7-10 knots vs 5-7 knots in older boats, still quite a dangerous whack. This problem may not be visible from outside the hull, as it is inside the hull and may not at all obvious on inspection from the inside at rest. I think checking the attachment of the hull to the liner by tapping could be highly subjective and unreliable. If the keel bolts go through conventional solid stiffening floors the floors can not be dislodged as it is all held together by the keelbolt tension, not just by bog. Incidentally it can be a bit difficult to get cured fibreglass to stick to cured fibreglass, even if the cured surfaces are roughed up during construction or repair. I think this Beneteau has substandard design, engineering and construction in this critical department.