Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 04-05-2015, 14:38   #1
Registered User
 
zboss's Avatar

Join Date: Sep 2011
Location: On a boat
Boat: Cabo Rico 38
Posts: 3,426
Multihulls that don't slam

I have had recent experiences on two catamarans (A leopard and a gemini) and they both had a hard slamming bridge deck in 2-3' seas.

Are there ANY cruising cats that don't slam? Its quite unnerving and I find myself less and less interested in cats as a result.
__________________

__________________
zboss is offline   Reply With Quote
Old 04-05-2015, 14:54   #2
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 5,764
Re: Multihulls that don't slam

Neither one of those is what I would call a cat with adequate bridge deck clearance.


Sent from my iPhone using Cruisers Sailing Forum
__________________

__________________
Sailmonkey is offline   Reply With Quote
Old 04-05-2015, 15:08   #3
Eternal Member
 
monte's Avatar

Cruisers Forum Supporter

Join Date: Jul 2011
Location: Australia
Boat: Lagoon 400
Posts: 3,650
Images: 1
Re: Multihulls that don't slam

I wouldn't say ours Lagoon 400 has never slammed, but I can honestly say I've never noticed it slam or been bothered by the occasional waves slapping the bridgedeck. Same goes for the Lagoon 380. We've sailed both from France, Atlantic Europe Coast, med, Atlantic, Caribbean, about 10000 M, upwind, downwind, upswell, across and down swell, waves up to 6m but we usually try to sail when the forecast is under 3m. I'm usually more concerned when I sail a mono and I hear the rig groan and creak as she is hit by a gust. Maybe fat wide lagoon hulls help with vertical stability, as opposed to narrower hulls, I don't know. I'd think leopard would be similar, but from memory some do have quite low bridge decks. Same goes with the Gemini. I think I've heard owners complaining about geminis slapping at anchor.
__________________
monte is offline   Reply With Quote
Old 04-05-2015, 15:10   #4
Registered User
 
Red Herring's Avatar

Join Date: Apr 2015
Location: Victoria BC
Posts: 208
Re: Multihulls that don't slam

I am curious as to which leopard you were in?
__________________
Red Herring is offline   Reply With Quote
Old 04-05-2015, 15:43   #5
RTB
Registered User
 
RTB's Avatar

Join Date: Nov 2008
Location: Home port Kemah, TX Currently in Brunswick Georgia
Boat: Hunter 36
Posts: 1,509
Images: 2
Re: Multihulls that don't slam

Quote:
Originally Posted by zboss View Post
Are there ANY cruising cats that don't slam? Its quite unnerving
I sailed with i2f to Colombia, and we had a few "bombs" go off even on Imagine. A 46' Simpson with a lot of bridge deck clearance.

Click image for larger version

Name:	imagine.jpg
Views:	549
Size:	294.1 KB
ID:	101410

Click image for larger version

Name:	imagine2.jpg
Views:	542
Size:	262.0 KB
ID:	101411

It is quite unnerving (VERY LOUD) if you aren't used to it, I guess. Being a mono guy, I would steer as high as possible, but John would come and turn down some. It would usually quiet things down. It just depends on conditions and point of sail.

Ralph
RTB is offline   Reply With Quote
Old 04-05-2015, 15:55   #6
Registered User
 
snort's Avatar

Join Date: Sep 2007
Location: Trunk (boot) of my car
Boat: Tinker Traveller...a dozen feet of bluewater awesomeness!
Posts: 1,031
Re: Multihulls that don't slam

This one:

__________________
snort is offline   Reply With Quote
Old 04-05-2015, 16:31   #7
Registered User
 
zboss's Avatar

Join Date: Sep 2011
Location: On a boat
Boat: Cabo Rico 38
Posts: 3,426
Re: Multihulls that don't slam

Quote:
Originally Posted by Red Herring View Post
I am curious as to which leopard you were in?
410. I've also been in a 380 that did not slam but was only a charter so it did not have all the weight of a cruising vessel, like a wind generator.
__________________
zboss is offline   Reply With Quote
Old 04-05-2015, 18:01   #8
Registered User

Join Date: Apr 2013
Posts: 4,866
Re: Multihulls that don't slam

We have a Gemini. Yes, if you try to run straight into 2-3' chop, she bangs away. Never heard of it causing a problem but definetly gets on your nerves. Bear off a bit and the problem largely goes away.

In most other conditions, it's not really an issue. With a big swell, you can get quite large waves and it's not an issue. Any kind of reaching or running and it's never been an issue regardless of wave size.

The only time it's really an issue is if you get a short chop in confused seas so you don't have a good option to bear off. If you are going thru a busy area with lots of boats throwing wakes from every which direction, that's when it gets annoying.

Of course, the benefits of all that space and a stable platform at anchor are more than worth the minor annoyance.
__________________
valhalla360 is offline   Reply With Quote
Old 04-05-2015, 18:09   #9
Senior Cruiser
 
mikereed100's Avatar

Cruisers Forum Supporter

Join Date: Dec 2005
Location: Santa Barbara
Boat: 46' custom cat
Posts: 1,571
Images: 2
Re: Multihulls that don't slam

As has been mentioned on these threads before, there are many variables involved in what makes a cat slam. Height of the bridgedeck is one, but the buoyancy of the hulls and the hull spacing are equally important. All cats will pound given the right circumstances but a boat with high bridgedeck, narrow tunnel and wide hulls will pound much less than a boat with low bridgedeck, wide hull spacing and narrow hulls.
__________________
Mike

www.sailblogs.com/member/rumdoxy

Come to the dark side. We have cookies.
mikereed100 is offline   Reply With Quote
Old 04-05-2015, 18:10   #10
Writing Full-Time Since 2014
 
thinwater's Avatar

Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 4,326
Re: Multihulls that don't slam

Very rare in PDQs... but there is a compromise.

The PDQ 32 (similar in size to the Geminis) has a slider that opens under the hard top in order to get standing headroom on the bridge deck, without having to look through 2 layers of windows, like the Gemini. Thus it is more fun to sail to windward in slop, but you get to stoop if it is cool and the slider is closed. The hard top provides enough coverage that the slider can stay open in virtually all weather, including rain. There is also one more step down in to the hulls on the PDQs, because the clearance is higher.

The PDQ 36 does not need the slider because it is just a little bigger.

There is no magic, only compromises.
__________________
Gear Testing--Engineering--Sailing

Writing full-time since 2014.
Bookstore:http://sail-delmarva.blogspot.com/20...ook-store.html
thinwater is offline   Reply With Quote
Old 04-05-2015, 19:34   #11
Registered User
 
zboss's Avatar

Join Date: Sep 2011
Location: On a boat
Boat: Cabo Rico 38
Posts: 3,426
Re: Multihulls that don't slam

Quote:
Originally Posted by mikereed100 View Post
As has been mentioned on these threads before, there are many variables involved in what makes a cat slam. Height of the bridgedeck is one, but the buoyancy of the hulls and the hull spacing are equally important. All cats will pound given the right circumstances but a boat with high bridgedeck, narrow tunnel and wide hulls will pound much less than a boat with low bridgedeck, wide hull spacing and narrow hulls.
and that boat is....?
__________________
zboss is offline   Reply With Quote
Old 04-05-2015, 19:51   #12
Registered User
 
Dulcesuenos's Avatar

Join Date: Dec 2010
Location: Florida Keys, Bahamas Bound
Boat: 38' French Cat
Posts: 2,828
Images: 4
Re: Multihulls that don't slam

We were going to get a mono, but couldn't find one that didn't heel,
Seriously though its all a compromise, our leopard 38 rarely slammed ever. We would get an occasional slap if a wave hit the inner side of the hull. Our athena not at all. Compared to bobbing and swaying and rolling at anchor, ilk take a little bridge deck noise any day.

Sent from my LG-LS980 using Cruisers Sailing Forum mobile app
__________________
Dulcesuenos is offline   Reply With Quote
Old 04-05-2015, 19:58   #13
Senior Cruiser
 
mikereed100's Avatar

Cruisers Forum Supporter

Join Date: Dec 2005
Location: Santa Barbara
Boat: 46' custom cat
Posts: 1,571
Images: 2
Re: Multihulls that don't slam

Quote:
Originally Posted by zboss View Post
and that boat is....?
Ahh. I forgot you were looking for specific boats. My boat is a custom design that I completely redesigned, so I guess you could say it is custom^2. It has relatively high bridgedeck clearance and fat hulls and the bridgdeck has never, as yet, slammed. The tradeoff is that we don't have the high top end speeds that a cat with narrower hulls would have. As Thinwater says, compromises.
__________________
Mike

www.sailblogs.com/member/rumdoxy

Come to the dark side. We have cookies.
mikereed100 is offline   Reply With Quote
Old 05-05-2015, 06:18   #14
Registered User
 
REsCat's Avatar

Join Date: Sep 2008
Location: Sarnia,Canada
Boat: Catana 471
Posts: 216
Re: Multihulls that don't slam

As I have remarked on the many previous threads on this subject... "ALL" Cats generally talked about or cruised on in this forum will pound/do pound sailing into a 20 kt+ wind short chop or confused seas etc. Obviously Cats that have higher, smooth bridge decks will probably pound less... but they will still pound at some point in those conditions.
Anyone who says or claims otherwise has never left the dock OR sailed in the above conditions OR has some entirely different concept of pounding/slamming that the majority of people on this forum agree on...
Monohulls will slam/pound occassionly in the above conditions...the same rules above apply.
I am continually amused by claims like such above....

Bob
__________________
REsCat is offline   Reply With Quote
Old 05-05-2015, 06:30   #15
Registered User
 
dirkdig's Avatar

Join Date: Oct 2007
Location: Geelong,Australia
Boat: Lagoon 440 Pathfinder
Posts: 838
Re: Multihulls that don't slam

Our Lagoon 440 has 650mm of bridgedeck clearance.
Going head on into seas of about 25 knot winds we get a little slamming, once 20 deg plus off that it drops right off.
Wide buoyant hulls with that clearance works.


Sent from my iPad using Cruisers Sailing Forum
__________________

__________________
dirkdig is offline   Reply With Quote
Reply

Tags
hull, multihull

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Request Permission to Come Onboard from Grand Slam Grand Slam Meets & Greets 7 30-03-2012 01:54
For Sale: Slam:Bermuda Hissar Sailing Shorts XL brakauskas Classifieds Archive 0 22-01-2012 19:04
For Sale: Brand New SLAM Ocean Waves Foul Weather Gear Tstullis Classifieds Archive 0 13-10-2011 15:46
Slam Dunk - Brisbane atoll Cruising News & Events 63 01-02-2011 20:26
Heavy Weather and Multihulls Sonosailor Multihull Sailboats 13 07-03-2008 10:03



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 14:44.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.