VoyForums
[ Show ]
Support VoyForums
[ Shrink ]
VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

Sun, December 22 2024, 02:00 [ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, 4, 5, 6, 7, 8, 9 ]

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Date Posted: - Thursday - 02/18/21 - 3:31pm
Author: Michael Harris (S/V Bird)
Subject: Centers of Effort/Resistance

Has anyone looked at the M31/32 center of effort (CoE) in relation to the keel's center of resistance (CoR)? I am reading Wally Ross' book, "Sail Power" and thought I would put some of the concepts to work to better understand S/V Bird, hull #136.

It seems that the CoE of the combined sails is a bit forward the CoR of the keel, especially if you include the effect of the rudder (which moves the CoR sternward). Moreover, going to windward, when the mizzen doesn't do much, the jib/main combine efforts right around the mast, which is quite forward the CoR of the keel.(the loss of the mizzen CoE eliminates its effect to pull the combined CoE sternward where it is better balanced by the CoR).

I have not noticed a great deal of lee helm in the boat, but maybe that's because of the heavy steering gear. Am I missing something? Any thoughts?

[ Next Thread | Previous Thread | Next Message | Previous Message ]

[ Login ] Create Account Not required to post.
Post a public reply to this message | Go post a new public message
 * HTML allowed in marked fields.
* Message subject (required):

* Name (required):

  Expression (Optional mood/title along with your name) Examples: (happy, sad, The Joyful, etc.) help)

  E-mail address (optional):

* Type your message here:

Choose Message Icon: [ View Emoticons ]

Notice: Copies of your message may remain on this and other systems on internet. Please be respectful.

[ Contact Forum Admin ]

Forum timezone: GMT-5
VF Version: 3.00b, ConfDB:
Before posting please read our privacy policy.
VoyForums(tm) is a Free Service from Voyager Info-Systems.
Copyright © 1998-2019 Voyager Info-Systems. All Rights Reserved.