Roll - SailNet Community
 
LinkBack Thread Tools
post #1 of Old 10-11-2010 Thread Starter
Senior Member
 
Advocate777's Avatar
 
Join Date: Sep 2010
Posts: 162
Thanks: 12
Thanked 4 Times in 4 Posts
Rep Power: 5
 
Roll

Does the 'roll' (side-to-side motion) of a boat at dock get lessened by the width of its beam? Or does that not really matter if the sea is up a bit. My partner is more sensitive to 'roll' on a boat than I am and I am looking at several different boats all in the same size range. (30-36') Can't afford a live-aboard catamaran otherwise I would go that route for her comfort. Any input would be appreciated. Are some makes of boat less 'roly' than others? Interested in the Cape Dory but am in earliest stages of boat shopping.

Chesapeake Bay area

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Advocate777 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of Old 10-11-2010
Moderator
 
Jeff_H's Avatar
 
Join Date: Feb 2000
Location: Annapolis, Md
Posts: 6,814
Thanks: 5
Thanked 131 Times in 105 Posts
Rep Power: 10
     
In a general sense, narrower boats roll through a wider angle but change roll rate more slowly. For some people, this gentler transition is more comfortable.

In a general sense, a beamier boat will roll through a narrower roll angle but will be more jerky on either side of the roll (like a catamarran). For some people, this smaller amount of movement is more comfortable.

And the reason that I say, "in general" is that some of the newer designs were developed with hull shapes and weight distributions so that they offer smaller roll angles and gentler motions.

Cape Dories tend to be in the large roll angles, gentler accelleration category but make poor choices if your goal is sailing on the Chesapeake since they sail so poorly in our prevailing conditions.

Jeff


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 offline  
Quote Quick Reply Share with Facebook
post #3 of Old 10-11-2010
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,458
Thanks: 0
Thanked 91 Times in 82 Posts
Rep Power: 8
   
Location in the marina and it's design can make a big difference. Where I live aboard in Victoria my bow faces the prevailing wind when it blows up. But the small marina 100 yards away has all the slips facing a direction 90 degrees different from most of the slips where I am. Even in a very slight wake the boats at the other marina all rock from side to side while we don't notice. The other night we had winds in the harbor of over 30k for most of the night. We could hear it but the motion was not an issue.

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #4 of Old 10-11-2010
Senior Member
 
CaptainForce's Avatar
 
Join Date: Jan 2006
Location: living aboard since 1972
Posts: 1,713
Thanks: 0
Thanked 12 Times in 12 Posts
Rep Power: 10
 
Jeff H makes some good points. I would add that, in addition to the keel configuration possibly slowing the period of the roll, the standing rigging has a large effect. In summary, there are too many variables to make a rule about the beam alone. I think your best choice would be to compare the action of the boats with wind and wakes. It's easiest to stand ashore and compare the swinging arc of different mastheads in the marina during rolling conditions, Take care and joy, Aythya crew
CaptainForce is offline  
Quote Quick Reply Share with Facebook
post #5 of Old 10-11-2010
Senior Member
 
St Anna's Avatar
 
Join Date: Mar 2003
Location: Southern QLD, Bayside
Posts: 1,428
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 13
 
Tide against wind cause the yacht to lie beam on to the swell at anchor. Methods to minimise this are as said earlier, but also include the type of keel - a small thin fin will cause a more jerky motion than a fuller keel. The beam of the boat will also play a part - but more so if the widest part is right at the stern. These 'bendy types' have a flat hull section aft of the small bolt on keel. The keel resistance is concentrated in a small area as opposed to a fuller type of keel.

A few months ago we were stuck in an anchorage which was very rolly [for about 10 days]. A 50' beneteau anchored close to us (too close - another story). As I spent a good deal of time watching this neighbor, I concluded that he rolled much more than we did. I even got to see his keel. His 'roll' was very jerky and althoughs ours was a PITA, I would hate to spend a night on our neighbors beneteau.

There are ways to minimise/reduce/eliminate ' roll' at anchor such as 'flopper stoppers, or a split snubber. We sometimes drag a small drogue to keep the bow into the tide flow

You mentioned a catamaran - I am biased but they can tend to have a 'washing machine' [some say seasick producing] like motion which is very unlike the smooth predictable motion of a yacht under sail. Go for a sail in a cat in some reasonable breeze and seas before you believe all the hype.

have a look at our 'sailing cat' Even she looks under the weather!
http://i665.photobucket.com/albums/v...a/P8030021.jpg


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
St Anna is offline  
Quote Quick Reply Share with Facebook
post #6 of Old 10-11-2010 Thread Starter
Senior Member
 
Advocate777's Avatar
 
Join Date: Sep 2010
Posts: 162
Thanks: 12
Thanked 4 Times in 4 Posts
Rep Power: 5
 
roll

Thanks for all the good input.
Speaking of boats, it will be based in the northern Chesapeake for now but the goal is to relocate to South Florida and Biscayne Bay and on to Bimini and eventually to the Caribbean and back.
I was drawn to the Cape Dory because the prices seemed in my basic range and alot of input regarding safety, but, I am a total novice and am just starting my search.
I like the catamaran's because they have so much living space, but they are not in my price range. I will be taking a course in maryland that uses Island Packet's (32) so I will see how they are. I just want to avoid the really narrow beamed yachts I have been on---they were fast sailing but not enough room for the two of us--I think it was a Pearson.
Anyway, any good recommendations for a live aboard would be appreciated, I liked a Nonsuch I saw but folks told me they thought they were 'odd' boats. It was real roomy, though.
Thanks for your input on 'roll' and types of sailboats

Chesapeake Bay area

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Advocate777 is offline  
Quote Quick Reply Share with Facebook
post #7 of Old 10-11-2010
Arrgh!
 
Join Date: Oct 2010
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
I think that a clear view of the horizon is more important that the rolling issue. If you can see the horizon, you can deal with motion. If you can't, you are far more susceptible to sea sickness. Mal de Mer is perhaps the worst thing in the world.

With old fashioned multihulls, like Pivers or CSK, the waterplane is very small, so the rolling and motion is benign. Also, most have big windows, so you can see the horizon. Most are plywood, so cheap, but only get one in "perfect" condition. Rotten wood is a bad thing. But if cared for, plywood boats last nicely seemingly forever. And the care isn't that bad. Even fiberglass boats, you need to repaint, deal with blisters, rotten cores, etc.

When you are living on a boat, the maintenance issues are right in your face, so its not that hard to stay on top of everything. But you must, regardless of the kind of boat.
u4ea is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

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

Password:


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

Email Address:
OR

Log-in









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
roll your own tethers janders Gear & Maintenance 33 08-19-2008 04:23 PM
small roll-up inflatable deniseO30 General Discussion (sailing related) 10 07-09-2008 06:00 PM
Roll Call lsbrodsky Pacific Seacraft 19 12-23-2006 01:28 PM
roll and tip tech? bigsarg1 Gear & Maintenance 1 06-06-2006 10:20 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