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42' Lake Geneva catamaran Alinghi, 1999

Increasing the 'flight envelope'
When asked to design a new multihull for Ernesto Bertarelli, with the Bol d'Or in mind, the first concern of co-designer Jo Richards and ourself was how to resolve the vagaries of Lake Geneva, where typical winds range around 360 degrees and from 0 to 30kt…

Our first given was the fact that the best existing boats are now too specialised. Catamarans are fastest in very light air whereas trimarans, originally developed from the old Formula 40s, dominate in a breeze. The task: to be able to beat either in their favoured condition.

The concept of the 'drive-train'

We worked first on the 'engine' in close collaboration with North Sails designer Patrick Mazuay, using Flow-Membrain, and Alessandro Castelli, using the sail optimisation program SailOpt. The Lake Class box rule limits overall height (24.5m) and length (19.6m), but not sail area.

Traditionally, perhaps out of habit, we tend to design the platform first, then the rig, then the sails. Here we reversed the process, first setting out the sail plan, without considering rig, beams or hulls at all…

Please click on the following link to read the remainder of this extract from an article in the August 2000 issue of Seahorse.

In the meantime, Alinghi won the Bol d'Or four times in a row from 2000 to 2003.
Congratulations to all the team!

Racing results:
Racing results
season rank class race location owner/skipper
20021stOverallBol d'OrLake Leman (SUI)Ernesto Bertarelli
20011stOverall"Bol dOr"Lake Leman (SUI)Ernesto Bertarelli
Articles:
99143_article_Seahorse_Aug2000.pdf (950 Kb)
99143_article_voiles_et_voiliers.pdf (479 Kb)
99143_article_course_au_large.pdf (270 Kb)
More informations:
www.decision.ch
www.spsystems.com/solutions/structural.htm
Specifications
  <42' Leman lake catamaran "Alinghi", 1999>
hull length : 42' (12.80 m)
length over all : 19.60 m
beam : 8.65 m
canoebody draft : 0.28 m
max. draft : 3.15 m
displacement in measurement trim : 460 kg
mainsail area : 127 m2
maxi genoa : 156 m2
solent 100% : 43 m2
genaker : 225 m2
mast height above wl : 24.50 m
mast construction : rotating carbon wing mast
hull construction : carbon epoxy on pvc and honycomb cores
built by : décision sa, fénil/corsier, (www.decision.ch)
aero/hydro engineering: rmi laval-jeantet
design team: luc mceuan, giovanni belgrano, jo richards, sebschmidt
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