| Holland Jachtbouw 141 |  |
 Both Andre Hoek and Holland Jachtbouw have in the past worked
on yacht designs that incorporated lifting keels, so they were familiar with the
advantages and disadvantages of such technology. Skylge is the largest
collaboration between the two parties and thus presented significant challenges.
The downside to a lifting keel is that the forces created while under way
literally work to pry apart the gap in the hull’s bottom. Skylge’s lifting keel
covers a range between 3.2 and 5.2 meters and is fitted with a 35-ton lead bulb
on the bottom that creates a substantial righting moment. This exacerbates the
well-documented "wedge effect," which happens when one side is pushed outboard
and the other is forced inboard. (Click image to enlarge) To solve the problem, Frans Brandjes Engineering, Hoek Design and
Holland Jachtbouw closed the circuit between the hull and keel using
large-diameter pins that harness the forces acting on the hull frame, fore and
aft and side to side. The pins connect the lifting keel to the hull’s bottom
plating through holes in the plating. An elastic rubber lining makes for a
rattle-free connection (and can also absorb shock loads in the event of
grounding). (Click image to enlarge)
 Hoek is convinced that the mechanism represents a technical breakthrough:
"It’s a very smart design and, structurally, I think it is the best lifting keel
ever built on a large yacht." (Click image to enlarge)
 A Modern Sailor’s Classic
DesignShowcase: Beauty by Design
Insider Passage
Course Change
Symmetry in Motion
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