SailNet Community - Reply to Topic
Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.

Thread: Roll over survival Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

  Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below

  Topic Review (Newest First)
01-27-2012 06:24 PM
Originally Posted by mikieg View Post
ok, so what is a good number?
A capsize ratio of around 2 is considered to be getting into the slow-to-recover range. Nigel Calder's "Cruising Handbook," has a good section on relative strengths and weaknesses of hull design and explains this ratio pretty well. US Sailing and a number of other sites have info. on this ratio.
01-27-2012 06:19 PM
Brent Swain I leave the cockpit as soon as the drogue is out, and there is nothing more I can do.
01-27-2012 06:18 PM
Originally Posted by jackdale View Post

The Fatal Storm and Proving Ground (The 1998 Sydney Hobart Race) should be right next to Fastnet Force 10 on you bookshelf. There are a couple of examples of capsized boats with tethered crews.

When cruising wear a PLB. It "might" help.
Here are some could clips from 98 Hobart- make sure you see a 5 parts.

Situation Critical - S01E06 - Hell on High Water - YouTube
01-27-2012 02:21 PM
jackdale What matters more than the righting ability is the ability to survive below.

01-27-2012 02:17 PM
mikieg ok, so what is a good number?
01-27-2012 10:50 AM
marianclaire This may help. Capsize Formula Dan S/V Marian Claire
01-27-2012 09:51 AM
mikieg tell me about this capsize ratio. how is it calculated and what is a good number?
01-27-2012 07:32 AM
smurphny Capsize ratio was #1 on my list of design factors in choosing an Alberg 35 to renovate and sail. It came in WAY ahead of speed, cabin space, and resale value. In the event of an actual 360 degree roll, differentiated from a knockdown, from what I've read, the mast/rigging will almost surely break. The swages/aluminum/s.s. is nowhere near strong enough to absorb the force of water, leveraged against the boat by the length of the rig. Even if you're below, this will require getting on deck to secure the battering ram that is likely still attached by the rigging that did not break. If far from help, saving pieces could be used to jury rig. So, you're going to be tethered to a boat being tossed around by breaking waves, rigging flying about, boat in danger of rolling again with you on deck. Would some sort of small rebreather be a wise thing to have if you ever have to be on deck in these conditions? As long as the hatches and boards are in you KNOW she will right herself eventually. Is it wise to even use an inflatable pfd which may go off at the wrong moment as you're struggling to secure the rig? Do you want one to go off if you're clinging like a barnacle to the inverted boat?
01-27-2012 02:09 AM
mikieg this is a damned good thread. these are indeed the very things i think about! i am looking forward to reading all the replies.
01-27-2012 01:14 AM
jlynker The book Desirable and Undesirable Characteristics of Offshore Yachts

has a chapter which describes tests of yachts in wave pools. They capsize boats and measure their ability to right themselves. Of course, if your main is up and sheeted in tight, or if when your boat is capsized it becomes a flat bottom boat, the time to right itself is significantly longer.

Knowing the characteristics of the boat you're sailing should inform your decision of when to go below and how to 'gracefully degrade' from the effort to make way.

Additional good advice in this book includes - having a mast with a Storm Tri-sail bent on and ready to go... for instance, the Lefiell OM3D mast has a 2nd integral track for a storm tri-sail. Cruising Mast & Boom Assemblies.

This book was an easy read... I absorbed it in 3 weeks... Lots of expert knowledge regarding cruising boats.
This thread has more than 10 replies. Click here to review the whole thread.

Posting Rules  
You may post new threads
You may 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 On

For the best viewing experience please update your browser to Google Chrome