Vendée Globe 2020

Discussion in 'Sailboats' started by Dolfiman, Oct 25, 2020.

  1. Dolfiman
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    Dolfiman Senior Member

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  2. Dolfiman
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    Dolfiman Senior Member

  3. wet feet
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    wet feet Senior Member

    I just watched the video and it doesn't look good.It seems to be the main central web and it has broken the outer skins in places as well as breaking the bond to the capping.Not a particularly easy repair to deal with at sea in the confined space and it would leave me uneasy about chasing weak spots around the web as the initial damage is patched up.Not impossible,but without something like an ultrasonic tester to look for voids and delamination it will be very difficult to be sure that no more problems are lurking.I suppose the best way to find out is to attempt a repair and regard Cape Town or thereabouts as a port of refuge if necessary.
     
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  4. Dolfiman
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    Dolfiman Senior Member

  5. wet feet
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    wet feet Senior Member

    Thats the video I saw and it doesn't look any less bad the second time of watching.It doesn't help him that cracks in a carbon laminate are not easy to see in a poorly lit part of the boat and tapping with a coin to check for delamination is not particularly precise.I wish him every success-but........
     
  6. Tiny Turnip
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    Tiny Turnip Senior Member

    I surely hope he has a decent repirator. Its not going to be fun in that hot, humid, confined space.
     
  7. Dolfiman
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    Dolfiman Senior Member

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  8. wet feet
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    wet feet Senior Member

    Hugo Boss still moving very slowly,presumably giving the repair time to cure properly.Jean Le Cam doing a fantastic job to maintain a good place-for me the outstanding performer of the race so far.
     
  9. Remmlinger
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    Remmlinger engineer


    I am puzzled. There were no extreme events. Weather, wave height, speed, everything was as expected. How can the boat suffer structural damage? From the video it looks not like a singular manufacturing error. The cracks are all over. It looks as if the designer did not have the right design loads. On the Alex Thomson website it says:
    "The product of more than two years of painstaking design and build work, undertaken by more than 100 naval architects, designers, engineers and boat builders". They spent ₤6 million.
    Isn't this an embarrassing disaster? If I were Peter Hobson, I would go back to university.
     
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  10. wet feet
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    wet feet Senior Member

    I don't think seeking a scapegoat is a particularly useful exercise.If the man in charge of technical matters has to check the figures of all team members then they are operating beyond their expertise and he will be overworked.I hope that the extensive data logging system the boat is equipped with is running at all times the boat is under way and the traces are being closely analysed for peak loadings so that the time and location of the damage can be pinpointed.Was it slamming or rig loads?I suppose the laminating wasn't prepreg as that would have probably left a trace of vacuum,pressure and temperature gradients that would help to determine whether a laminating process failed but with wet laminating there probably isn't a record of the parameters.

    Sadly the spare material on board might more usefully have been incorporated into the layup at the outset.I would hope the data logging is undamaged and able to provide an early warning if the structure gives further trouble.I wouldn't have any criticism of Alex Thomson if he felt that pulling out before the Southern Ocean was a better idea than causing upset by requiring rescue by the Australian Navy at some remote part of the globe and annoying the taxpayers down under.
     
  11. Dolfiman
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    Dolfiman Senior Member

    There are usually 2 modes of mechanical failure, either an instant rupture due a peak load , or by fatigue, i.e. microcracks initiated by some peak loads days or weeks ago and then slowly proliferating with the repetition of loads up the failure. The last load before the failure can be low, it is just that the microcrack finally extends up to a macro rupture. Here that looks like more such mode.
     
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  12. Dolfiman
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    Dolfiman Senior Member

  13. wet feet
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    wet feet Senior Member

    L'Occitane is looking a bit slow in the last update-1.9 knots in a 12 knot breeze?
     
  14. Dolfiman
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    Dolfiman Senior Member

    L'Occitane : Armel Tripon had received a penalty of 4 hours for having intentionally restarted his engine to escape from a bad maneuver off Cape Finisterre. He has therefore repaired this day, which explains his trajectory in the opposite direction on the mapping in the 3pm ranking.
    Linkedout : serious cracks detected on the port foil, not repairable >> this foil is off duty.
     

  15. Dolfiman
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    Dolfiman Senior Member

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