Boom Vangs - 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 > Contributing Authors > Racing Articles
 Not a Member? 


Closed Thread
 
LinkBack Thread Tools
  #1  
Old 10-04-2000
Contributing Authors
 
Join Date: Jan 2000
Posts: 325
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 15
SailNet is on a distinguished road
Boom Vangs

Vangs prevent the boom from rising, which tensions the leech of the sail, and in turn removes twist from the mainsail. By removing the twist and flattening the sail, stability improves in a seaway, reducing roll and rudder correction, speed increases and the boat is able to sail closer to the wind.

There are two types of boom vangs: block and tackle vangs, and solid vangs. The forces which operate on vangs are focused under the mainsail’s center of effort. That center of effort is the best location of attachment to the boom however, it changes on different points of sail. It moves forward running downwind, is centered when reaching and moves farther aft when close-hauled.

BLOCK & TACKLE VANGS

  • The basic system has a 3:1 or 4:1 purchase using a fiddle block for attachment to the boom and a fiddle block with becket and cam cleat for attachment to the mast.
  • The boom fiddle block should be fitted with a snap shackle or detachable becket for removal from the boom if a boom strap is not used.
  • To increase purchase to 6:1 or 8:1, add a doubling block at the boom fitting.
  • Self-cleating vangs are generally used on small dinghies. A small block is used on the boom and a fiddle with V-jam or cam cleat is attached to the mast base.
  • If the vang is to be used as a preventer, the mast end block should also be fitted with a snap shackle. The block and tackle vang, by adding a snap shackle at the dead end and relocating the point of attachment, can be used as a preventer permitting a controlled jibe, and for running downwind by holding the boom forward, rather than down.


Block & Tackle Vang

  • The blocks and tackle are fitted to the boom by either a strap, or a long, deep-V bail, or vang bracket.

 
Mast Fitting
 
Deep-V Boom Bail Fitting


Boom Bracket Fitting

SOLID VANGS

  • The solid vang eliminates the need for a topping lift.
  • Solid vangs should have an adjustable tensioning device, which can be set to receive the desired angle.
  • Purchase systems on solid vangs can be coil-spring type, gas spring, ratchet, and tackle.


Solid Vang with Purchase Tackle

CHOOSING A BOOM VANG AND FITTINGS
There are a few factors to consider in selecting a vang:

  • Decide whether a solid vang or a block and tackle vang is desirable keeping in mind that the primary advantage to a solid vang is the elimination of the topping lift.
  • Determine if the vang will be controlled by the crew, or by the skipper from the cockpit.
  • Appraise what amount of mechanical advantage is required for controlling the mainsail.

TIPS

  • Small dinghies require no more than 3:1 purchase.
  • Larger dinghies and small keelboats use 4:1 or 5:1.
  • Larger boats may need 8:1 purchase or more.
  • Always use the manufacturer’s recommendations in the selection of a vang for your particular boat and sailing style, whether racing, cruising or daysailing.
  • Fittings should be matched to the vang. There is no sense paying the additional cost of fittings meant for solid vangs if a block and tackle vang is going to be used. Whichever fitting is used on the boom, it must be able to distribute loads over a wide area.

INSTALLATION
The average-skilled person with minimal tools can install a boom vang.

Toolbox:

  • Screwdriver
  • Wrenches
  • Drill and bits
  • Caulking
  • Fasteners, if a block and tackle vang kit or solid vang is used
  • Splicing tool, line, and blocks for non-kit block and tackle vangs


View products

Closed Thread


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 02:49 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.