The ratios and other numbers - can someone enlighten me or point me to a resource? - Page 2 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Boat Review and Purchase Forum > Sailboat Design and Construction
 Not a Member? 


Reply
 
LinkBack Thread Tools
  #11  
Old 07-08-2008
arbarnhart's Avatar
Senior Member
 
Join Date: Jun 2007
Location: North Carolina
Posts: 761
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
arbarnhart is on a distinguished road
I don't think so, but it does warrant a closer look just to be sure. I have a cutting diagram of the keel itself (PO had a new one made and gave me the diagram in case it ever needs another). and there is no hole in the keel itself for a through bolt other than the swivel point and the cable eye.
__________________
-Andy
Newport 17 - "Kohanna"
At sea Darwin's hypotheses is the final arbiter of right of way.
Reply With Quote Quick reply to this message Share with Facebook
  #12  
Old 07-08-2008
Jeff_H's Avatar
Moderator
 
Join Date: Feb 2000
Location: Annapolis, Md
Posts: 6,595
Thanks: 5
Thanked 96 Times in 72 Posts
Rep Power: 10
Jeff_H has a spectacular aura about Jeff_H has a spectacular aura about Jeff_H has a spectacular aura about
I would suggest that almost all of those number have zero or no bearing on the reality at hand. Newport, and most trailer-sailer builders of that era routinely published displacements that were way low of the actual weight of the boats. These published weights were typically based on pretty hypothetical dry design weights, which made no consideration of actual sailing weights, let alone crew weight. Published sail areas were typically with the stock overlappinbg headsails, and were not with 100% foretriangle as is supposed to be used for SA/D and so your SA/D is probably substantially lower than you think as well. Motion comfort is probably about right for a boat with relatively hard chines and a flat bottom, a high vertical center of gravity and so on. Then there is Capsize Screen Formula, which is mostly a useless formula since it does not include the major factors that control capsize (vertical center of gravity and buoyancy, dampening etc.). That said with the Newports high vertical center of gravity and low ballast ratio they should be in the near disaster zone of 3 or 4.

Having sailed trailerables out in the Atlantic Ocean shoals, it comes down to this, in good weather you should be fine, but when things turn, and they can quickly, you can get very steep, very tall waves, and a boat like this is easily rolled.

I once did an offshore race out of Savannah on a 25 IOR quarter tonner that I owned where we needed to round a mark roughly 5 miles offshore. The weather was predicted to be nice and the race began just that way. As we rounded the mark teh weather turned really nasty, and within 15-20 minutes we were in 10-12 foot seas that were occasionally breaking and threatening to roll us. This was a boat with a 40% ballast ratio and 5' 6" draft. The Newport is a boat with a 23% ballast ratio when dry, and far less loaded.

Jeff
Reply With Quote Quick reply to this message Share with Facebook
  #13  
Old 07-08-2008
arbarnhart's Avatar
Senior Member
 
Join Date: Jun 2007
Location: North Carolina
Posts: 761
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
arbarnhart is on a distinguished road
Jeff,

I think you nailed my primary concern - big water. Based on mostly anecdotal evidence, I think it handles wind pretty well in terms of not getting completely knocked all the way over before recovering (if that's what you call depowering and heading up). I have only been in touch with one person who has ever taken one into true blue water and he doesn't recommend it for such. A few others sail off the coast but stay near shore. Oddly, I still have not encountered a roll over story. Maybe there just aren't that many of the boats or most are sailed in protected waters; I don't know.

Again, I don't plan to do blue water. But I wouldn't want to set out on the Beaufort to Lookout run if I thought that a squall that produced big breaking seas would almost guarantee a roll over. If I thought it might but that if I sailed well I would be okay, then I would be okay with choosing to take that slight risk (assuming the chance of bad weather was low to begin with). The run I am talking about is about 7 miles of exposed sailing near shore. If there were big crashing waves, shore wouldn't exactly be a safe haven though. And yes, I know what they call this part of the Atlantic...

"Near disaster zone"? That's a pretty harsh rating. Would it be worthwhile to secure more weight in the bilge or is that just rearranging the deck chairs?

Thanks for the frank assessment.
__________________
-Andy
Newport 17 - "Kohanna"
At sea Darwin's hypotheses is the final arbiter of right of way.
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

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:
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:

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

 
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



All times are GMT -4. The time now is 04:00 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.