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Jason Ker over afgebroken kiel: ‘niet het origineel’

11:58

De kiel die Sydney Hobart-jacht LCE Showtime verloor, was niet het origineel. Dat stelt Ker Jacht Design, ontwerper van de 40-voeter die op de terugweg van Tasmanië naar huis zijn kiel verloor. Door heldhaftig optreden van de schipper en de aanwezigheid van de hulpdiensten in de buurt kon de bemanning worden gered.

“Het jacht heeft een andere kiel gekregen, ontworpen en gebouwd door andere partijen. We hebben veel kielen ontworpen in de afgelopen 23 jaar en geen daarvan heeft het ooit begeven. Showtime is, voor zover wij weten, ons enige ontwerp dat niet met de door ons ontworpen kiel was uitgerust. De kiel aan Showtime was ontworpen als verticale holle balk, die op een horizontale plaat was gelast. Die plaat was in een ondiepe holte in de romp gezet en aan de constructie bevestigd. Deze aanpak zouden we nooit goedkeuren gezien de hoge spanningen die op de las komen te staan.”

Oorspronkelijk bericht (Engels)

“We would like to make clear that the keel lost by the Ker 40 ‘Showtime’ was not designed by Ker Yacht Design. The yacht had a retrofit keel fitted, designed by its owner’s local design office near Sydney and built by a local fabricator.

We have designed a great many keels over the last 23 years which have been constructed by many different builders around the world, none have ever failed. To the best of our knowledge, Showtime is the only yacht designed by us to have had a keel fitted that was not designed by us.

The keel, designed by the owner’s local Naval Architect, was configured as a vertical hollow strut welded to a horizontal mounting plate, which in turn was sitting in a shallow recess in the boat’s hull and bolted to the boat’s structure. This is not a design approach we would ever endorse as the high stress point at the junction is coincident with the horizontal welded joint.

The skipper of the delivery voyage Rob Buchanan and his crew only survived through extremely calm thinking and bravery under stressful circumstances. Rob woke hearing a metallic ‘Ping’ just before he was thrown across the boat from his windward bunk as they capsized.

While they made their plans to escape it was apparent to Rob that the inverted boat was holding air pressure in the hull, so the top plate of the keel can only have remained fully bolted to the yacht. When the crew swam down out of the boat, they saw that the vertical part of the keel was missing, revealing that the keel had failed at the welded joint between the exposed vertical and the recessed horizontal parts.

Best regards,
Jason Ker”

Omslagfoto: Salty Dingo

Tags: , , , , Last modified: 15 januari 2020
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