I have a new blog entry about YONI, one of my more interesting projects - Page 3 - SailNet Community

   Search Sailnet:

 forums  store  

Quick Menu
Boat Reviews  
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Hatches and Portlights
Interior And Galley
Marine Electronics
Other Items
Plumbing and Pumps
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here

Go Back   SailNet Community > General Interest > General Discussion (sailing related)
 Not a Member? 

Like Tree2Likes
LinkBack Thread Tools
Old 12-10-2011
Geoff54's Avatar
Senior Member
Join Date: Oct 2011
Posts: 692
Thanks: 0
Thanked 6 Times in 6 Posts
Rep Power: 3
Geoff54 is on a distinguished road
Nice looking Yacht and really interesting to read the story behind it.

I hope I’m not asking too much - I have a simple question which may be require too long or complicated an answer for here - I won’t be offended if you tell me to go and read up on design principles (would you mind pointing me in the right direction?). Also, I believe that “Limit of Positive Stability” is exactly the same as “Angle of Vanishing Stability” i.e. the zero axis when the Center of Gravity is directly above the Center of Buoyancy, before which (in the absence of any other forces), a boat will right and beyond which it will continue to invert. If I’m wrong, that might explain things, otherwise…

I was surprised to read that that achieving a Limit of Positive Stability of 135 degrees “can be a challenge for some cruising boats”. I always assumed that, within some reasonable limit, achieving a higher AVS was mostly a matter of lowering the C of G by using a deeper and/or heavier keel. I took a quick look at the R.Y.A. Stability List and while there are many boats with numbers under 135, there are quite a few respected cruising yachts with numbers significantly above that (examples include Nordship 40DS – 140, Island Packet 485 – 143, Swan 602 – 153, Sweden Yachts 42 – 156, Vancouver 34 – 166). There are even a few with an AVS of 180, which I didn’t realize was possible – a cork ball with a six inch nail stuck in it, maybe.

I always thought that lower AVS was a compromise because of some combination of cost, desire to keep the overall displacement down or sacrificed because of form stability (cue – wide butt discussion).

I assume I’m missing something but I’m not quite sure what.


Reply With Quote Share with Facebook
Old 12-10-2011
grumpy old man
Join Date: Apr 2011
Posts: 3,646
Thanks: 1
Thanked 74 Times in 70 Posts
Rep Power: 4
bobperry will become famous soon enough
Knee is much better thanks.
Please visit my blog. It's fun to read.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Bob's Blog ....

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Please also visit my new web site
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Similar Threads
Thread Thread Starter Forum Replies Last Post
I have a new blog entry on rudders bobperry General Discussion (sailing related) 48 11-12-2011 06:56 PM
Check out my new blog entry bobperry General Discussion (sailing related) 2 10-29-2011 08:51 PM
Interesting Blog on buying and restoring a sailboat mkrautha Boat Review and Purchase Forum 19 01-06-2010 12:45 PM
New blog entry, including lots of pics and a BBQ pic for CD! labatt General Discussion (sailing related) 7 04-17-2009 09:14 PM
New blog entry - Charleston to Vero Beach labatt General Discussion (sailing related) 4 01-31-2009 11:55 PM

All times are GMT -4. The time now is 10:22 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.