Boom Vang Attachment - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 14 Old 07-12-2011 Thread Starter
Junior Member
 
Kallisti's Avatar
 
Join Date: Jul 2009
Location: Pittsburgh, PA
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Boom Vang Attachment

last weekend I took my Grampian 26 out for the first time after a 3 year restoration!. The breeze was very light and we were just able to make way but every time we hit a wake or swell the boom would bounce and spill the little air we had. Also I was concerned about the strain on the mailsail/rigging caused by the bouncing boom, not sure if that concern is valid or not. Anyway, the reason this is in Gear/Maintenance is because i realized my obvious lack of a boom vang. I am looking at a soft block/line vang. The problem I am having is how to attach the bail to the boom as my boat has no attachment points for a vang. I am a little hesitant to start drilling holes through my boom without first procuring some advise.

So my questions to the oracles of Sailnet are these:

1. What is the best way to attach a bail to the boom? (bolt, rivet, etc.)

2. Will drilling bolt holes in the boom decrease structural integrity?

3. Can I also use a bail on the mast or do i need some sort of bracket?

4. The vang should be set at about a 45 deg. angle, correct?

Thank you, any advise is appreciated!
Kallisti is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 14 Old 07-12-2011
Chastened
 
BubbleheadMd's Avatar
 
Join Date: Nov 2009
Location: Edgewater/Annapolis
Posts: 3,298
Thanks: 2
Thanked 78 Times in 73 Posts
Rep Power: 6
 
Send a message via Yahoo to BubbleheadMd
1. Nut and bolt.
2. No.
3. Yes, you can use a bail. I do.
4. Yes, about 45. You want to have an angle of attack that gives you the most leverage, so you can tighten the vang. If you have an unfavorable angle, you'll want to add purchase to your vang tackle to give you the necessary strength to tighten it.

S/V Old Shoes
1973 Pearson 30 #255
BubbleheadMd is offline  
Quote Quick Reply Share with Facebook
post #3 of 14 Old 07-12-2011 Thread Starter
Junior Member
 
Kallisti's Avatar
 
Join Date: Jul 2009
Location: Pittsburgh, PA
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Thanks for the quick responce!

There is not much realestate between the step and the gooseneck so a 45 deg. angle may not be realistic. I was going to use 5/16 line and tackle at 4:1. do you think i should upgrade to 3/8 to accomodate the higher loads?
Kallisti is offline  
Quote Quick Reply Share with Facebook
post #4 of 14 Old 07-12-2011
Junior Member
 
aeventyr60's Avatar
 
Join Date: Jun 2011
Location: Andaman Sea
Posts: 2,338
Thanks: 25
Thanked 63 Times in 60 Posts
Rep Power: 5
 
Instead of drilling holes in your boom and attaching a boom vail, you can use nylon webbing to create a harness. This also will take up the shock loads. I use this method on a wood boom on a 37' offshore boat...
aeventyr60 is offline  
Quote Quick Reply Share with Facebook
post #5 of 14 Old 07-12-2011
Member
 
jimq26's Avatar
 
Join Date: Nov 2001
Posts: 88
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 14
 
I use a BoomKicker with a vang directly below it.

Fastened all boom fittings with sheet metal screws (along with Locktite) They haven't come loose in 12 years of hard racing etc.
jimq26 is offline  
Quote Quick Reply Share with Facebook
post #6 of 14 Old 07-12-2011
Crotchety Old Member
 
tomperanteau's Avatar
 
Join Date: Jun 2009
Location: San Pedro Harbor, California
Posts: 900
Thanks: 2
Thanked 3 Times in 3 Posts
Rep Power: 7
 
Quote:
Originally Posted by jimq26 View Post
Fastened all boom fittings with sheet metal screws (along with Locktite) They haven't come loose in 12 years of hard racing etc.
Agreed. Watch screwing into Aluminum, as it tends to gall. I installed mine with screws (a rigid boom vang) several months ago and have had her out quite a bit. No problems yet.

Capt'n Tom Living Aboard 50/50

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

S/V Footprints

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Youtube

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


1976 41' Morgan Out Island Sloop. Refitting and redoing her interior for an extended voyage.

1969 Crealock/Columbia 36 Sloop completely refitted in 2000 and new Yanmar in 2006. (for sale)
tomperanteau is offline  
Quote Quick Reply Share with Facebook
post #7 of 14 Old 07-13-2011 Thread Starter
Junior Member
 
Kallisti's Avatar
 
Join Date: Jul 2009
Location: Pittsburgh, PA
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Thanks for all the advise!

Hey, jimq26, nice to meet another G26 driver!

I think I am going to bail the boom and mast with carrige bolts for the vang. But i think i will go machine screws for the boomkicker.

Again thanks for all the feedback!

S/V Kallisti
1971 Grampian 26 #241
Presque Isle, Lake Erie
Kallisti is offline  
Quote Quick Reply Share with Facebook
post #8 of 14 Old 07-13-2011
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,488
Thanks: 0
Thanked 94 Times in 85 Posts
Rep Power: 8
   
Carriage bolts?

Drill the appropriate size hole and tap for the machine screw you are using. Short machine screws - 1/2" maybe. Use Tef Gel on the threads.

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #9 of 14 Old 07-13-2011
Senior Member
 
Join Date: Feb 2011
Location: San Francisco Bay area
Posts: 2,553
Thanks: 5
Thanked 62 Times in 62 Posts
Rep Power: 5
 
1. What is the best way to attach a bail to the boom? (bolt, rivet, etc.)

2. Will drilling bolt holes in the boom decrease structural integrity?

3. Can I also use a bail on the mast or do i need some sort of bracket?

4. The vang should be set at about a 45 deg. angle, correct?

Thank you, any advise is appreciated![/QUOTE]

1) I recently installed a boomvang (solid) and used 1/4" S/S rivets. I expect them to be stronger than a threaded joint in thin metal.

With a rivet, failure is when either the rivet snaps or the rivet rips the hole out. With a bolt in thin metal, it's when the threads shear.

It's interesting to go and look how the boat builder attached things to the mast and boom. How does the boom attach to the mast for example? Stainless rivets. Maybe they knew what they were doing?

You'll probably need need 1/4" rivets and an ordinary riveter won't cut it. You'll need something like this :
Amazon.com: Astro Pneumatic 1426 1/4-Inch Heavy-Duty Hand Riveter: Home Improvement

2) Yes, but so little it doesn't matter. There are already plenty of holes in the boom and mast where things are attached so two more won't make any real difference.

In case you want to go down that route, Garhauer sell solid boomvangs where they custom make the boom and mast brackets.
MarkSF is offline  
Quote Quick Reply Share with Facebook
post #10 of 14 Old 07-21-2011
Member
 
Join Date: Jun 2010
Location: Miami, Florida
Posts: 97
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
Quote:
Originally Posted by mitiempo View Post
Carriage bolts?

Drill the appropriate size hole and tap for the machine screw you are using. Short machine screws - 1/2" maybe. Use Tef Gel on the threads.
Machine screws should not be used in sheet metal. You can use a bolt through the boom and a nut on the other side, but don't expect the threads that you tap in the thin sheet metal will hold. Use sheet metal screws instead, they are made for that purpose. Or, go with rivets. Stainless is stronger at a given size, but since the boom is aluminium you may prefer that to avoid galvanic corrosion. Although, I haven't seen that as a problem even in the decades old boats I have sailed, so myself I will go for stainless rivets. If you are really concerned about strength, there are high-strength rivets that leave a core. Check out mcmaster.com for instance.

Ensenada 20, 1972
ulferlingsson 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
Boom Vang vs Boom furling? Windkiller General Discussion (sailing related) 7 07-26-2011 07:27 PM
Looking for vang attachment hardware kwaltersmi Gear & Maintenance 12 06-13-2010 04:42 AM
vang attachment bluwateronly Gear & Maintenance 3 01-27-2009 11:10 PM
[New Video Out] The Boom Jack or Boom Vang Giulietta General Discussion (sailing related) 8 01-23-2008 10:33 PM
Attachment method for Vang KeelHaulin Gear & Maintenance 17 11-26-2007 12:22 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