Talk:Boom vang

Proposed revision
A boom vang (US) or kicking strap (UK) is a system on a sailboat that typically uses a block and tackle or similar system to exert downward force part way along the boom so as to control the twist of the mainsail from its foot to its head, increasing the sail's power and the boat's speed. In windy weather it improves controlability and safety when running.

An older term is martingale. Was the martingale used as a boom vang? {citation required}

The vang typically runs from a low point on the mast (or a geometrically equivalent point on the hull) to a point about a third of the way along the boom. Due to the great force that can be needed to control the height of the boom in strong winds, a multi-purchase pulley system is often employed, sometimes incorporating a lever.

Rod vang
Yachts are increasingly using rod vangs which incorporate spring loaded rods that can be used to support the weight of the boom, instead of using a topping lift. This makes it quicker, easier and safer to set, drop, or reef the mainsail particularly when short-handed or in an emergency. A rod vang typically incorporates a metal spring or gas spring, its length being controlled by block and tackle. On a larger boat a hydraulic vang may be used, incorporating a hydraulic cylinder controlled by a manual or electric hydraulic pump.

In light weather the rod vang can be used to lift the boom slightly to allow the sail to twist somewhat.

-Updated GilesW 13:00, 20 September 2007 (UTC)

Picture title
On larger sailboats, the boom vang is often a combination of a spring loaded rod controlled by a block and tackle system as shown in this picture. GilesW 12:52, 19 September 2007 (UTC)

Input welcome - GilesW 08:29, 19 September 2007 (UTC)

Boom Jack
The term "Boom Jack" is also used. Should this be added? Scatophaga (talk) 11:07, 23 September 2010 (UTC)