Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 12-07-2008, 05:27   #1
cruiser

Join Date: May 2008
Location: Brecon, Wales
Boat: St Francis 50 on order
Posts: 269
Sinking Cats

Modern well designed cats as I understand it do not sink - they float upside down.

I have just heard of a cat sinking on the way to the Caribbean last year when the mast punched a hole in the cat and it sank - does anyone know of other cats that have sunk?
__________________

__________________
Gludy is offline   Reply With Quote
Old 12-07-2008, 05:40   #2
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,577
Images: 240
Like ANY boat, Catamarans can (& have*) be sunk - usually when “holed” in some manner.
Capsized Catamarans tend to remain floating upside down.

For recent stories, search catamarans:
SAMPSON
CATANOVA
__________________

__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 12-07-2008, 06:02   #3
cruiser

Join Date: Nov 2004
Posts: 4,525
Unless you have watertight bulkheads, fully enclosed in many areas that are not compromised, any boat can sink (whaler types made of foam excepted).
__________________
ssullivan is offline   Reply With Quote
Old 12-07-2008, 06:03   #4
Marine Service Provider
 
Factor's Avatar

Join Date: Dec 2006
Location: Brisbane Australia
Boat: Corsair Dash MKII
Posts: 4,084
Quote:
Originally Posted by GordMay View Post
Like ANY boat, Catamarans can (& have*) be sunk - usually when “holed” in some manner.
Capsized Catamarans tend to remain floating upside down.
With respect that should read SOME catamarans,

My multi wouldnt sink if you cut ten holes in the bottom of it.

Bagatelle (crowther) hit the bricks and destroyed half of one hull and stayed afloat

A madman tried to scuttle his own Factsback 43 eroica, it floated in spite of his efforts
__________________
Factor is offline   Reply With Quote
Old 12-07-2008, 06:22   #5
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,577
Images: 240
Quote:
Originally Posted by Factor View Post
1.With respect that should read SOME catamarans,
2.My multi wouldnt sink if you cut ten holes in the bottom of it...
1. With respect, I'll grant that I might have said "virtually" all ...
2. Captain Edward J. Smith was of the same opinion regarding his vessel ...
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 12-07-2008, 06:28   #6
Senior Cruiser
 
JusDreaming's Avatar

Cruisers Forum Supporter

Join Date: Jul 2004
Location: Stuart, FL & Bahamas Cruising
Boat: Lagoon 37
Posts: 880
Images: 13
I was told by a coast guardsman that when they found abandoned catamarans they could not sink them. They would shoot them with their guns but could only get them to sink to the gunnels. They would blow the cabin off. but they just sink to where they were level with the waterline
__________________
Denny and Diane
Lagoon 37
http://www.svjusdreaming.bravehost.com/
http://www.sailblogs.com/member/svjusdreaming/
"The only way to get a good crew is to marry one." -Eric Hiscock
JusDreaming is offline   Reply With Quote
Old 12-07-2008, 06:30   #7
Registered User

Join Date: Jun 2008
Boat: Designing a global explorer (full keel & steel)
Posts: 353
Quote:
Originally Posted by Factor View Post
My multi wouldnt sink if you cut ten holes in the bottom of it.
Really??? What if you cut ten holes in each hull?
__________________
exfishnz is offline   Reply With Quote
Old 12-07-2008, 06:43   #8
Registered User

Join Date: Jan 2007
Location: Fremantle Australia
Boat: Schioning 12.3 "Wilderness" Bi-Rig under construction
Posts: 558
Send a message via Skype™ to Whimsical
Depends on what it is made out of.
Take mine for example. The cored panels alone displace over 7 ton while the loaded displacement is only 6.5 ton. This is without taking into account any sealed boyancy chambers of which there are many.

Mike
__________________
Whimsical is offline   Reply With Quote
Old 12-07-2008, 06:53   #9
cruiser

Join Date: May 2008
Location: Brecon, Wales
Boat: St Francis 50 on order
Posts: 269
All interesting stuff but how do you find out if the cat you are looking at can be sunk other than asking for comments from the dealer?
__________________
Gludy is offline   Reply With Quote
Old 12-07-2008, 07:01   #10
Registered User
 
cat man do's Avatar

Join Date: Aug 2006
Location: Brisbane Australia [until the boats launched]
Boat: 50ft powercat, light,long and low powered
Posts: 4,409
Images: 36
Quote:
Originally Posted by Gludy View Post
All interesting stuff but how do you find out if the cat you are looking at can be sunk other than asking for comments from the dealer?

Go out and punch holes through the bottom

Dave
__________________
"Money can't buy you happiness but it can buy you a yacht large enough to pull up right alongside it"...............David Lee Roth
Long Distance Motorboat Cruising – It Is Possible on a Small Budget
cat man do is offline   Reply With Quote
Old 12-07-2008, 07:10   #11
cruiser

Join Date: May 2008
Location: Brecon, Wales
Boat: St Francis 50 on order
Posts: 269
GordMay
"recent stories, search catamarans:
SAMPSON
CATANOVA"

Both your examples were powered cats with heavy engines/gear etc.
I am talking about sailing cats
__________________
Gludy is offline   Reply With Quote
Old 12-07-2008, 07:14   #12
Registered User

Join Date: Jan 2007
Location: Fremantle Australia
Boat: Schioning 12.3 "Wilderness" Bi-Rig under construction
Posts: 558
Send a message via Skype™ to Whimsical
Quote:
Originally Posted by Gludy View Post
All interesting stuff but how do you find out if the cat you are looking at can be sunk other than asking for comments from the dealer?
Custom boat and talk to the designer.

Mike
__________________
Whimsical is offline   Reply With Quote
Old 12-07-2008, 08:59   #13
Senior Cruiser
 
maxingout's Avatar

Cruisers Forum Supporter

Join Date: Dec 2006
Location: Fort Pierce, Phoenix
Boat: Privilege 39 Catamaran, Exit Only
Posts: 2,606
I know of a chartered Privilege catamaran in the Caribbean that had a hose failure on a through hull. The charterers abandoned the catamaran because water was coming into the hull. They actually got on board a ship who "rescued" them. The charter agency knew the boat could not sink, and they found out where the boat was abandoned from the charterers, and they sent a recovery boat out to find the catamaran.

When they found it, the Privilege was motoring in circles with water up to a person's calf in one of the hulls. They fixed the leak, pumped the water out and returned it to charter base.

That's one of the reasons I brought my Privilege 39. I wanted a boat that was extremely difficult to sink.
__________________
Dave -Sailing Vessel Exit Only

http://SailingUNI.com
http://maxingout.com
http://PositiveThinkingSailor.com
maxingout is offline   Reply With Quote
Old 12-07-2008, 09:15   #14
cruiser
 
BigCat's Avatar

Join Date: May 2007
Location: Everett, Washington
Posts: 765
Floatation and multihulls

The BigCat 65 structure has about 450 cubic feet of displacement in its structure, that is, if you add the thickness of all the structures, most of which is balsa cored. That's 28,800 pounds of floatation. I would think that it is probably typical in that it could easily sink to the point of being more or less awash. It has a lot of tankage, but that tankage is pretty close to neutral in buoyancy if the tanks are full. I think that to reliably float high, multihulls should have some sealed compartments or floatation (2 pound density polyurethane) foam. One cubic foot of foam will float 62 pounds of weight. I would think that most catamarans would float well upside down because they have a lot of trapped air inside of them. However, if you start cutting holes in the bottom because you are offshore and need access and shelter, you are in some jeopardy of sinking., or at least floating rather low.

My advice is to add a bunch of foam. The BigCat 65 uses crossbeams which I am filling with foam, and I am filling the one foot thick bridgedeck with foam, too. This is enough foam to float the boat fully loaded, and is in addition to the roughly 29,000 pounds of floatation in the structure. If upside down, the BigCat 65 should float with the bridgedeck above the water. We have discussed all of this before, I think a lot of it is under the thread about liferafts. You are adding 16 pounds of foam per 1000 pounds of floatation to your boat, but it is worth it to me.
__________________
BigCat is offline   Reply With Quote
Old 12-07-2008, 09:20   #15
Registered User
 
cat man do's Avatar

Join Date: Aug 2006
Location: Brisbane Australia [until the boats launched]
Boat: 50ft powercat, light,long and low powered
Posts: 4,409
Images: 36
There was a 40 ft Brisbane cruising cat that flew a hull and the leverage on the daggerboard tore a large section of hull away,

That hull filled with water and drowned the motor on that side, but they still got her back to port under her own power.

Dave
__________________

__________________
"Money can't buy you happiness but it can buy you a yacht large enough to pull up right alongside it"...............David Lee Roth
Long Distance Motorboat Cruising – It Is Possible on a Small Budget
cat man do is offline   Reply With Quote
Reply

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
C.G. rescues 4 from sinking 48 footer off of S. Carolina Steve Rust Monohull Sailboats 7 26-07-2008 23:41
Report into Sinking of UK Yacht swagman General Sailing Forum 15 13-04-2007 16:17
New theory (and old equations) may explain causes of ship-sinking freak waves learningcurve Off Topic Forum 0 14-09-2006 07:07
QE2B sinking Alan Wheeler General Sailing Forum 2 08-10-2004 15:58
Cats Abigail Families, Kids and Pets Afloat 1 23-05-2003 08:11



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:45.


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.