Deprecated: Function set_magic_quotes_runtime() is deprecated in /var/www/vhosts/tartan37.com/httpdocs/t37forum/common.php on line 88 Tartan37.com • View topic - A few thoughts on performance

Tartan37.com

Tartan 37 Owner's Forum - Ride the wind, but look good doing it!
The time is 30 Sep 2023 11:38

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 13 Posts ]  Go to page Previous  1, 2
Author Message
 Post subject: Re: A few thoughts on performance
PostPosted: 18 Nov 2022 10:50 
Offline
Skipper

Joined: 29 Dec 2006 09:38
Posts: 654
I have the deep fin keel version, professionally faired bottom, feathering prop, with some very decent, if aging sails at my Maine home. I seem to have very good pointing ability relative to others, but I have a lot of experience with her after 30 years of ownership. I have not been in a situation where I felt I was outpointed by a keel boat in all those years, but I will try to do some graphic measuring of it next summer. It is very difficult to remove all the mitigating factors: I have a feathering prop, how clean or dirty things are at any given time, how much fuel and water I am carrying, I have too much chain for anchoring (240') I carry under the V berth, and the currents here in Maine have ridiculous back eddies that confound prediction and measurement, but I will give it a try.


 
 Profile Email  
 
 Post subject: Re: A few thoughts on performance
PostPosted: 18 Nov 2022 12:40 
Offline
Tactictian

Joined: 06 Aug 2020 09:02
Posts: 140
Velera wrote:
I have the deep fin keel version, professionally faired bottom, feathering prop, with some very decent, if aging sails at my Maine home. I seem to have very good pointing ability relative to others, but I have a lot of experience with her after 30 years of ownership. I have not been in a situation where I felt I was outpointed by a keel boat in all those years, but I will try to do some graphic measuring of it next summer. It is very difficult to remove all the mitigating factors: I have a feathering prop, how clean or dirty things are at any given time, how much fuel and water I am carrying, I have too much chain for anchoring (240') I carry under the V berth, and the currents here in Maine have ridiculous back eddies that confound prediction and measurement, but I will give it a try.


It would be an interesting experiment. Having said that, VPPs can actually do a pretty decent job predicting these things. For a keel/CB, the issue really is that neither the keel nor the CB is operating at their most efficient leeway angle and the turbulence at the keel/CB interface degrades efficiency further. All that likely adds up to greater required leeway than what your boat requires with it's more efficient fin.

My boat had full fuel, full stbd water tank, MT port tank, 100+ feet of chain with a 45lb Mantis, dinghy on foredeck, plenty of gear aboard. So, I was basically in full load cruising mode.

My sails are excellent and new, both North. I have an extensive racing background so my sails were set and trimmed properly. I think I was hand steering by this time but frankly my Ray below-deck AP is extremely good sailing the boat in apparent wind mode.


 
 Profile Email  
 
 Post subject: Re: A few thoughts on performance
PostPosted: 19 Nov 2022 09:33 
Offline
Skipper

Joined: 14 Jul 2012 20:36
Posts: 492
Location: Norfolk, Va
During the summer we take a lot of gear off the boat. I think we point very well. We sail beer can races and have two J30s in our class. If we have more than 8kts we usually point with them or better. None of the other cruiser/racers come close. Mostly flat water, no current. Sails are getting older, added weight, but still do ok.

_________________
Hull #208, Puff Card
Southern Chesapeake Bay


 
 Profile Email  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 13 Posts ]  Go to page Previous  1, 2

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Powered by phpBB © 2002, 2006 phpBB Group