28II Mainsheet system - 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 > Boat Builders Row > Newport
 Not a Member? 


Reply
 
LinkBack Thread Tools
  #1  
Old 03-18-2011
Member
 
Join Date: Dec 2008
Location: Chesapeake Bay
Posts: 52
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 7
stpabr is on a distinguished road
28II Mainsheet system

Getting ready to replace all mainsheet blocks on the Newport 28II. Removed the old 5 block system and probably will maintain the 5:1. Is the winch really neccessary to haul in the mainsheet with the 5:1 system?
I'm looking at Harken Carbo 57mm blocks, which fall under the Mainsheet load calculator of 850 + or - lbs with 18 knots of wind, but the Harken Tech Rep recommends 75mm do to the chance of overloading the blocks with the winch. Hoping to keep costs down!
Also I want to use the Small Boat (22mm) traveler system with 4:1. I plan on extending the High Beam track past the U channel to put the Traveler ends on with the cams.
Also is 18 knots of wind about right for the first reef?
I have never sailed this boat and towards the end of a restoration.

Thanks,
__________________
Stephen
1982 Newport 28II
S/V Sea Hawg

"It isn't that life ashore is distasteful to me. But life at sea is better."
-Sir Francis Drake
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 03-18-2011
zz4gta's Avatar
I don't discuss my member
 
Join Date: Aug 2007
Location: Chesapeake Bay
Posts: 2,468
Thanks: 0
Thanked 24 Times in 24 Posts
Rep Power: 8
zz4gta is on a distinguished road
According to this site, Mainsheet Load Calculator 20 kts apparent translates into 1069 lbs. Divide that by 5 and you get 214 on the tail. Can you pull over 200 lbs? I know I can't, that's why you have a winch. Consider adding a fine tune adjustment and doubling your purchase.

Also, you can try the smaller blocks, but if they grenade and take someone's head off, you can't sue harken. Also, the shock load on a jibe will be WAY higher than your static sailing around.
__________________
Merit 25 # 764 "Audrey"
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 03-18-2011
Member
 
Join Date: Dec 2008
Location: Chesapeake Bay
Posts: 52
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 7
stpabr is on a distinguished road
I do believe when 20 knots comes, I'll be reefing down, which will change the dynamics of the Luff and foot measurements. Using 18 knots, 32.5 luff and 10.3 foot I get 790. Don't forget "D" what did you input for D?

Do you sail a Newport 28?
Come on 28 owners, what size\system is your mainsheet and traveler?

Thanks for the input!
__________________
Stephen
1982 Newport 28II
S/V Sea Hawg

"It isn't that life ashore is distasteful to me. But life at sea is better."
-Sir Francis Drake

Last edited by stpabr; 03-19-2011 at 07:12 AM.
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 03-21-2011
zz4gta's Avatar
I don't discuss my member
 
Join Date: Aug 2007
Location: Chesapeake Bay
Posts: 2,468
Thanks: 0
Thanked 24 Times in 24 Posts
Rep Power: 8
zz4gta is on a distinguished road
I do not sail the Newport 28.
I put 5' for "D". The formula is very sensitive to the "D" value.
Given you're SA/D ratio, I'd probably reef at a sustained 20 kts or more depending on what headsail I was flying.
__________________
Merit 25 # 764 "Audrey"
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 03-25-2011
Member
 
Join Date: Dec 2008
Location: Chesapeake Bay
Posts: 52
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 7
stpabr is on a distinguished road
Any Newport 28 sailors out there?
__________________
Stephen
1982 Newport 28II
S/V Sea Hawg

"It isn't that life ashore is distasteful to me. But life at sea is better."
-Sir Francis Drake
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 03-26-2011
KeelHaulin's Avatar
STARBOARD!!
 
Join Date: Mar 2006
Posts: 1,662
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 10
KeelHaulin will become famous soon enough KeelHaulin will become famous soon enough
I think the wind load estimate is low. It's not unreasonable to sail without reefing the main in 20 kts true which would be higher in apparent wind. In addition there is loading in a gust or a round down. Running the calculator with your main dimensions, nominal length from the end of the boom of 3' and a max wind load of 30 kts (not unreasonable to get a +10 kt gust), the total load on the boom is 1750 lbs. That means the load on the traveler block is 1750 and the load on each of thee blocks on the boom will be 600 lbs. The 57mm single block is rated 792 lbs SWL, which should be OK (use at your own risk), but the double with becket for the traveler is too small, rated at 1584 lbs. I would use a fiddle block on the traveler, so look for one rated higher than 2000 lbs.
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pearson 27 Mainsheet system davidpm General Discussion (sailing related) 11 02-18-2013 04:19 PM
Help choosing my barrier coat system: Interprotect vs. West System vs. Other? Beersmith Gear & Maintenance 30 02-09-2011 02:10 PM
mainsheet system for daysailer dogfuel General Discussion (sailing related) 3 11-29-2010 08:12 PM
Pros and cons of split mainsheet system zAr Seamanship & Navigation 9 06-06-2009 11:12 PM
Mainsheet System tdw General Discussion (sailing related) 31 11-09-2008 06:36 AM


All times are GMT -4. The time now is 02:26 AM.

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.