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Go Back   SailNet Community > On Board > Boat Review and Purchase Forum > Sailboat Design and Construction > Multihull > CATAMARAN DESIGN and BRIDEDECK CLEARANCE
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Thread: CATAMARAN DESIGN and BRIDEDECK CLEARANCE Reply to Thread
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Topic Review (Newest First)
10-27-2014 06:30 PM
piclarke
Re: CATAMARAN DESIGN and BRIDEDECK CLEARANCE

Quote:
Originally Posted by piclarke View Post
Multihullgirl


Went directly to the manufacturer to find the bridge deck clearance so we both know the answer and received this reply,




Paste Copy

"communicate to me the name and serial number of the boat."



Best Regards
Yannick Wolfcarius
after sales service
Catana Catamarans.

y.wolfcarius@groupeponcin.com

Catana

Can you please advise me the details so I can communicate with Yannick to find the answer.

Thanks

cyclone warning for the south pacific Cyclone season 2014 to 2015 and sever extreme weather happenings warnings droughts thunder storms perfect storms fork lightning flash flooding torential rain mud slides rivers bursting banks with beach web cams l
Where is the reply Multihullgirl.

LIONHEART A MacGregor 70ft Mono hull production cruising Yacht Captain Delivery skipper New Zealand crewseeker crew finder search seeker oceania marine directory find finder yachts Island cruising ass fiji tahiti hawaii South, Pacific survival noumea

10-24-2014 06:58 PM
piclarke
Re: CATAMARAN DESIGN and BRIDEDECK CLEARANCE

Quote:
Originally Posted by Multihullgirl View Post
Gavin le Sueur, MULTIHULL SEAMANSHIP
Rudy Choy, CATAMARANS OFFSHORE
Chris White, THE CRUISING MULTIHULL
Derek Harvey, MULTIHULLS FOR CRUISING AND RACING
Rob James, MULTIHULLS OFFSHORE

that should get you started. BTW, manufacturers don't really lie outright, but they stretch the hell out of the truth...

I reread my post. I'll clarify my point:

when I said 'it doesn't matter,' I mean, the numbers don't matter. I can see the difference between a high and a low bridge cat. That isn't the only consideration for a seagoing cat.

I believe there is no such thing as a cat with a high enough bridge that will never, ever slam. I believe it is best to get a high-bridgedeck cat to avoid slamming, but I find it hard to believe that there is a cat that will not find itself doing some slamming at some point.

I went to the Miami show and looked at the new cat designs, and with one exception, I'd be damned if I'd go to sea in them, frankly. And the bridgedecks weren't the worst problem these boats had IMO.
Multihullgirl


Went directly to the manufacturer to find the bridge deck clearance so we both know the answer and received this reply,




Paste Copy

"communicate to me the name and serial number of the boat."



Best Regards
Yannick Wolfcarius
after sales service
Catana Catamarans.

y.wolfcarius@groupeponcin.com

Catana

Can you please advise me the details so I can communicate with Yannick to find the answer.

Thanks

cyclone warning for the south pacific Cyclone season 2014 to 2015 and sever extreme weather happenings warnings droughts thunder storms perfect storms fork lightning flash flooding torential rain mud slides rivers bursting banks with beach web cams l
10-24-2014 09:18 AM
TropicCat
Re: CATAMARAN DESIGN and BRIDEDECK CLEARANCE

Quote:
Originally Posted by piclarke View Post
With respect I'm actually trying to find a Catamaran owner with bridge deck clearance .950 or more that can state / verify his vessel does not slam going to windward sailing or motoring with heavy seas or confused seas / or heavy confused harbour waters. Is this not what forums are for. Trying to establish what the manufactures claim to be correct or incorrect....
Why? Are you writing a class paper, or are you boat shopping? Or God forbid, are you yet another guy planning a catamaran build project?

Did you review the hull design link I posted?

Do you understand windage and the balance which has to be struck between it and bridge deck clearance?

Do you you understand why?
10-23-2014 10:08 PM
piclarke
Re: CATAMARAN DESIGN and BRIDEDECK CLEARANCE

Quote:
Originally Posted by Multihullgirl View Post
Gavin le Sueur, MULTIHULL SEAMANSHIP
Rudy Choy, CATAMARANS OFFSHORE
Chris White, THE CRUISING MULTIHULL
Derek Harvey, MULTIHULLS FOR CRUISING AND RACING
Rob James, MULTIHULLS OFFSHORE

that should get you started. BTW, manufacturers don't really lie outright, but they stretch the hell out of the truth...

I reread my post. I'll clarify my point:

when I said 'it doesn't matter,' I mean, the numbers don't matter. I can see the difference between a high and a low bridge cat. That isn't the only consideration for a seagoing cat.

I believe there is no such thing as a cat with a high enough bridge that will never, ever slam. I believe it is best to get a high-bridgedeck cat to avoid slamming, but I find it hard to believe that there is a cat that will not find itself doing some slamming at some point.

I went to the Miami show and looked at the new cat designs, and with one exception, I'd be damned if I'd go to sea in them, frankly. And the bridgedecks weren't the worst problem these boats had IMO.
QUOTE
and with one exception, I'd be damned if I'd go to sea in them,


Care to name the design and provide a hyperlink to the designer.

Interested as to what you would choose to sail across oceans. Plus other members would also be interested I presume.

I look forward to your reply.


Worldwide Best Yachting surf beach harbour entrances and ocean sea conditions with Web Cams reports and weather swell reports marine data resource links site business accommdation directory guide lists base including new zealand australia south pacif
10-23-2014 09:12 PM
Multihullgirl
Re: CATAMARAN DESIGN and BRIDEDECK CLEARANCE

Gavin le Sueur, MULTIHULL SEAMANSHIP
Rudy Choy, CATAMARANS OFFSHORE
Chris White, THE CRUISING MULTIHULL
Derek Harvey, MULTIHULLS FOR CRUISING AND RACING
Rob James, MULTIHULLS OFFSHORE

that should get you started. BTW, manufacturers don't really lie outright, but they stretch the hell out of the truth...

I reread my post. I'll clarify my point:

when I said 'it doesn't matter,' I mean, the numbers don't matter. I can see the difference between a high and a low bridge cat. That isn't the only consideration for a seagoing cat.

I believe there is no such thing as a cat with a high enough bridge that will never, ever slam. I believe it is best to get a high-bridgedeck cat to avoid slamming, but I find it hard to believe that there is a cat that will not find itself doing some slamming at some point.

I went to the Miami show and looked at the new cat designs, and with one exception, I'd be damned if I'd go to sea in them, frankly. And the bridgedecks weren't the worst problem these boats had IMO.
10-23-2014 07:50 PM
piclarke
Re: CATAMARAN DESIGN and BRIDEDECK CLEARANCE

quote=Multihullgirl;2300938]I don't know how high my bridge is, and to be honest, it really doesn't matter.

I may stand corrected here, but I'd bet that there is no such thing as a cat which doesn't suffer some slamming, if the conditions are right for her to slam. Of course, the lower the bridge, the more often that slamming will occur. It's fairly obvious which cats are low and which aren't, just by looking. A few cm one way or the other ain't going to tell any tales.

BTW, the answers you seek are already discussed ad nauseum online, and there are plenty of books on the subject. If you find it painful to Google, I find it painful to repeat freely available information.[/quote]

Thanks for your comments.

A proven and now accepted as the best and fastest cruising catamaran designer states his Catamarans do not slam. His designs have bridge decks clearance between

.950 and 1.2 meters and he states bridge deck clearance does matter and I attend to agree.

The numbers have not been discussed ad nausea online as can been seen from the posts so far. Even your posts do not quote the numbers.

Been to the manufacturer Catana website which does not quote a 40s model and the length vessels that are their models, custom built vessels specifications bridge deck clearance are not mentioned on all the designs.

With respect I'm actually trying to find a Catamaran owner with bridge deck clearance .950 or more that can state / verify his vessel does not slam going to windward sailing or motoring with heavy seas or confused seas / or heavy confused harbour waters. Is this not what forums are for. Trying to establish what the manufactures claim to be correct or incorrect.

http://homepages.ihug.co.nz/~philcla...scupstats.html
10-23-2014 09:33 AM
Multihullgirl
Re: CATAMARAN DESIGN and BRIDEDECK CLEARANCE

I don't know how high my bridge is, and to be honest, it really doesn't matter.

I may stand corrected here, but I'd bet that there is no such thing as a cat which doesn't suffer some slamming, if the conditions are right for her to slam. Of course, the lower the bridge, the more often that slamming will occur. It's fairly obvious which cats are low and which aren't, just by looking. A few cm one way or the other ain't going to tell any tales.

BTW, the answers you seek are already discussed ad nauseum online, and there are plenty of books on the subject. If you find it painful to Google, I find it painful to repeat freely available information.
10-22-2014 10:36 PM
TropicCat
Re: CATAMARAN DESIGN and BRIDEDECK CLEARANCE

Quote:
Originally Posted by piclarke View Post
Thanks for your comments as for answers I'm finding them with the following posts following from yours and before yours.
This is a world cruising site for sailing cruisers all vessel types is it not. Sorry for being thoughtless but I thought this would be the best website for cruising sailors not armchair sailors but real sailors to obtain actual experienced opinions with expert advice from persons that are or have actually crossed oceans.

Would you be the web master from Sailing Anarchy. It is easy to get that impression by you trying to direct traffic from this site.

Kind regards.
First... not affiliated with Sailing Anarchy, though I guess I am a sort of webmaster, but only of what's in my signature.

I gave you real world advice from a cruising catamaran owner who's sailed his boat for 10 years. Which is what you asked for. Some of my adventures have been published in sailing magazines, and as near as I can tell from what you're looking for, Sailing Anarchy is the place to get it, as they're the only ones who care.

Yes, Cruising has been defined by some as fixing your boat in exotic surroundings. Unless you've a money tree in your backyard, the idea is not to break your boat, as things will fail soon enough without you helping.

Some catamarans go fast, some are designed to carry cruising loads, all surf waves at high speed yet all are governed by the same basic hull design formulas as a monohull (with caveats). (design notes are here and formulas on page 2)These are not compatible design objectives as the formulas will show. Australians build some nice designs but the industry is defined today by what is built in France and South Africa and much of what they build goes straight to charter fleets.

Such is the multihull world we live in
10-22-2014 09:54 PM
piclarke
Re: CATAMARAN DESIGN and BRIDEDECK CLEARANCE

Quote:
Originally Posted by TropicCat View Post
It's all about the weather window. If any of us were in a hurry we wouldn't own sail boats!!
If you don't have speed you have nothing let alone safety.

Firmly believe boats should have enough speed to sail around a cyclone or a storm or get to port before the storm arrives at your sailing course / path.


NOT ONE FOR WAITING FOR 42 DAYS OR MORE FOR A WINDOW TO SUIT A SLOW CROSSING. berth age fees for multihull vessels are far to expensive for long port stays and one seems to spend the time when waiting for a weather window partying, which is also expensive during long stays at ports.

WITH RESPECT AGAIN, WHEN I'm IN A HURRY I catch a commercial airline jet.
10-22-2014 09:37 PM
piclarke
Re: CATAMARAN DESIGN and BRIDEDECK CLEARANCE

Quote:
Originally Posted by Multihullgirl View Post
Yes, someone is going to beat into that. Well, it was 30kt, not 36. It was a Gulf crossing/delivery, and we didn't have the luxury of heading off. Boat is a 1992 Catana 40S.

In this vid, we are motorsailing. By this time the wind had cocked slightly east of exactly, directly, in front of us, so we did hang some laundry, but for probably 8 or more hours before the wind had been directly on the nose (frontal passage) and we just doused and engined into it.

Despite the high bridgedeck, and believe me I don't load my boats down, she did some banging, although I believe had the wavelengths been longer, banging might have been less. The Gulf of Mexico has a surprisingly short wave pattern, short and steep.

Apparently TropicCat is quite lucky to be able to make the choices he apparently does.
As for the rest of us, sometimes you just gotta get there.


Thanks for your contribution much appreciated. Can you remember or know the bridge deck clearance numbers. Save me googling it. The numbers do help when replying and what additional clearance in your opinion would have eliminated the some banging.
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