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  #1  
Old 09-08-2012
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Exclamation Curved dagger Boards

Will the next genneration designs, cruising Catamarans with curved dagger boards devalue designs without them.
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Old 09-09-2012
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Re: Curved dagger Boards

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Originally Posted by piclarke View Post
Will the next genneration designs, cruising Catamarans with curved dagger boards devalue designs without them.
Are you talking about hydro foil cats? If so, I doubt the technology will find it's way to cruising cats. They are way too heavy and under powered to fly!
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Exclamation Re: Curved dagger Boards

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Are you talking about hydro foil cats? If so, I doubt the technology will find it's way to cruising cats. They are way too heavy and under powered to fly!
Apparrently these naval designers disagree with you.

Daggerboard - Speed - Catana - Catamarans - Cruising




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Old 09-09-2012
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Re: Curved dagger Boards

And winged keels became a fad after the AC success. It turns out, they were not really good for much more than beating a rule. The application of curved boards on an over-weight cruising cat compared to an AC boat is even more remote.

But some fool will buy them, so some huckster will sell them.
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Old 09-10-2012
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Re: Curved dagger Boards

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Originally Posted by piclarke View Post
Apparrently these naval designers disagree with you.

Daggerboard - Speed - Catana - Catamarans - Cruising




Well they do say "New types of daggerboard may emerge after a whole series of trials, when developing a new model of boat. "


I would be very surprised to see a full on production cruising cat that could lift both hulls out of the water on foils. Perhaps they feel there might be some benefit to even partially lifting the hulls? Even so, I doubt curved foils will become mainstream on cruising cats any time soon!
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Old 09-10-2012
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Re: Curved dagger Boards

l'Hydroptere has been pretty on the edge for like 30 years and while its impressive stuff in all reality it still breaks a lot and just way to FAST for normal people to enjoy in a cruising mode


The whole point of a cruising cat is stable FUN platform
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Old 01-15-2014
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Re: Curved dagger Boards

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Originally Posted by tommays View Post
l'Hydroptere has been pretty on the edge for like 30 years and while its impressive stuff in all reality it still breaks a lot and just way to FAST for normal people to enjoy in a cruising mode


The whole point of a cruising cat is stable FUN platform

Disagree but horses for courses.

If you dont have speed you have nothing. Slow boats can't sail around bad weather, pirates, Cyclones, Hurricanes, etc .. More time time sailing to where you want to go and more time sight seeing meeting people and being in a safe harbour whilst slow boats are getting beat up, damaged and spending less time site seeing in paradise.

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Old 01-15-2014
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Re: Curved dagger Boards

They don't talk about foiling a cruising cat but about " offering more lift and so reducing the wet area of the boat."

Also they are not using them (curved foils) but simple daggers. What they say is this" New types of daggerboard may emerge after a whole series of trials, when developing a new model of boat."

In fact Catana are a bit faster than lagoon but pretty slow on the world of performance cruising cats. If I remember right they had a lousy performance on the last ARC.
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Old 01-15-2014
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Re: Curved dagger Boards

Quote:
Originally Posted by piclarke View Post
Apparrently these naval designers disagree with you.

Daggerboard - Speed - Catana - Catamarans - Cruising




The article sounds more like it was penned by the marketing department than the yacht designer's office. You don't get lift without drag. When you talk about creating enough lift to impact a boat of this size and weight, its hard to generate enough drive in the sails to begin to see a benefit. It may be possible to design assymetrical curved boards which offer some lift advantages at high windspeed, but you are stuck with all that drag when beating in lighter air. I am not sure that the trade off is compelling unless you are designing very performance oriented cat, or you are a marketer trying to hawk your wares.
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Old 01-15-2014
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Re: Curved dagger Boards

After all they are already using them on the 59



and will be using them on the 70



But I am a bit skeptic about their use and efficiency on cruising cats that are not even particularly fast.

Edit.

In fact having read this interview with Peter Melvin I am even more skeptic:

http://www.proboat.com/daggerboard-debate.html

To generate considerable lift a curved daggerboard needs some heel. Who wants to heel a cruising cat?

Curved daggerboard are also a downwind tool, they are not suited to go upwind (unless they have a position where they become vertical and that's not the case) and they had daggerboards on Catanas precisely to have a better upwind potential, that they will lose with these curved daggerboards.
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Last edited by PCP; 01-15-2014 at 07:41 PM.
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