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About Frogman56

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    Ocean stuff, wine, history, staying sane

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  1. Frogman56

    Which Cookson 12 would you buy?

    Philosophers gone back to nz.....
  2. Frogman56

    How much speed am I losing?

    Shu maybe not as much as you think.....onset flow at less than 20 degres (awa)
  3. Frogman56

    How much speed am I losing?

    Toad, The pressure differential at the foot of the jib is probably about 4x that of the main, maybe even more, like up to 8x
  4. Frogman56

    How much speed am I losing?

    Take a point from elsewhere too... tp52s velcroing the foot of their staysails to the deck! 50 mm toerail is good too!
  5. Frogman56

    How much speed am I losing?

    Next time you can, stick your hand in the gap and be alarmed by the air velocity!
  6. Frogman56

    How much speed am I losing?

    No, but any gap appears to do a lot of damage. My guess, 25 mm gap is around 1/2?
  7. Frogman56

    How much speed am I losing?

    We did the test. Two 470s, as identical as we could make them, same masts, sails etc etc. Both boats from top of fleet. Even speed with jibs sealed to deck. Change 1, repeat beat. Slower by about the measure. Alter both, altered boat now slower. Repeat original... The only highly definite thing from alot of reasonably well managed 2 boat testing.
  8. Frogman56

    How much speed am I losing?

    Tested very carefully in one design....40 seconds in approx 18 minute beat...
  9. Frogman56

    How much speed am I losing?

    It is a measurable, unnecessary loss and probably greater than you think. E.G a 75 mm gap in a dinghy equals upwind vmg loss of about 3%.
  10. Frogman56

    Sydney To Hobart 2018

    Nothing remotely resembling the RNLI, nor the coverage the Fastnet has for the Irish Sea in rescue terms. In practical terms there is about 180 miles (say 39 to 42S) where you are on your own.
  11. Frogman56

    Sydney To Hobart 2018

    Despite JS opinion, i do not think there is any doubt that the rshyr is, on average, tougher than the Fastnet. And a more difficult safety situation. Hence Cat 1 vs. Cat2. It is also expensive, for compliance and redlivery, logistics in general. I reckon any fleet size near 100 boats is a good result, all things considered.
  12. Frogman56

    Express 34 hits submerged object, now what?

    5 knot grounding should not be such a big deal. Check current ISO recreational yacht guidelines.....e.g. ~ 10 knot grounding speed for offshore boats, etc.
  13. Frogman56

    Sydney To Hobart 2018

    Tricky looking Cabbage Tree race 1900 tomorrow, qualifier for rshyr... Funny trough over some of the course at start + 14 hours approx.
  14. Frogman56

    What cloth for a Code Zero Jib?

    LP only affected by the luff curve though!
  15. Frogman56

    The 2018 Golden Globe Race

    Hmmm, The 'bolt' could have been a large od tube.....not sure welding is a good idea, well fitted mechanical with many small fasteners better. Chay's method for attaching....the overlength lower ends is viable.... Miracles are also achievable on this size boat with some 5mm dynex and any simple purchase,e.g. spanish windlass or 8:1 cascade to further distribute the load.