Tender or Stiff - Page 2 - SailNet Community
LinkBack Thread Tools
post #11 of 13 Old 09-06-2012
Jeff_H's Avatar
Join Date: Feb 2000
Location: Annapolis, Md
Posts: 7,345
Thanks: 9
Thanked 232 Times in 183 Posts
Rep Power: 10
Re: Tender or Stiff

Originally Posted by davidlaing View Post
Light displacement is not, in itself, a cause of tenderness. A low ballast/displacement ratio is, but the distribution of the ballast matters, too. A boat with a given B/D ratio and a deeply-positioned ballast will be stiffer than a boat with the same B/D ratio but with a more shallowly-positioned ballast.
You are right that "Light displacement is not, in itself, a cause of tenderness." But a boat's ballast ratio really has almost nothing to 'stiffness' as the term as it is used in naval architecture. As classically defined Stiffness is primarily about initial stability (form stability).


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay
Jeff_H is online now  
Quote Quick Reply Share with Facebook
Sponsored Links
post #12 of 13 Old 09-06-2012
Senior Member
Join Date: Oct 2009
Location: Pennsylvania
Posts: 706
Thanks: 11
Thanked 2 Times in 2 Posts
Rep Power: 8
Re: Tender or Stiff

A lot of boats particularly older designs are intended to heel at a certain angle increasing their waterline and thereby their speed. Hence the reason for being initially "tender".
LinekinBayCD is offline  
Quote Quick Reply Share with Facebook
post #13 of 13 Old 09-06-2012
Remember you're a womble
PaulinVictoria's Avatar
Join Date: Aug 2009
Location: Sidney, BC
Posts: 2,299
Thanks: 11
Thanked 64 Times in 62 Posts
Rep Power: 8
Re: Tender or Stiff

There's also the Dellenbaugh measurement which gives you some idea of stiffness of a particular boat. It's a calculation as if 1 pound of force was pushed against a square foot of sail (with some other specifics around it being sheeted central etc). Not an exact measurement but does give some indications around how easily a boat heels. Here's a graph for C&Cs for example, http://cncphotoalbum.com/technical/stability.htm shows you that something like a Mk1 30ft is very stiff, whilst the Mk II turned out to be quite tender. Both sail excellently, so it's not really an indication of how well they sail.

Orange Crush
1974 C&C27 MkII

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
PaulinVictoria is offline  
Quote Quick Reply Share with Facebook

Quick Reply

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
Water Tender Dingy 9.4 gunnyman1 General Discussion (sailing related) 5 07-11-2008 07:39 PM
Tender marking requirements joub General Discussion (sailing related) 1 02-20-2004 09:15 AM
Fixing wood tender bert2 Gear & Maintenance 3 09-18-2003 08:05 PM
Tank Tender wannasail Gear & Maintenance 1 09-22-2002 07:31 PM
Tender: inflatable or folding? Lucian General Discussion (sailing related) 10 09-02-2002 01:38 AM

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
Trackbacks are On
Pingbacks are On
Refbacks are On

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