Yourbestsailvideo
The boom vang on downwind points of sail
December 28, 2023 · 9 min · 3K views
What this video covers
Proper adjustment of the boom vang is critical when sailing on broad reaches or downwind to maintain sail shape and boat stability. As a boat bears away from the wind, the mainsheet angle shifts from vertical to horizontal, losing its ability to pull the boom downward.1:32 Without sufficient tension on the vang, the boom rises, causing the upper portion of the mainsail to twist excessively.2:54 This loss of sail area reduces total propulsion by decreasing the effective surface area presented to the wind.4:00 Furthermore, an untensioned vang allows the top of the sail to twist forward, creating a lateral force component that induces significant rolling oscillations.4:27 These lateral forces exacerbate the boat's movement, particularly in strong winds or heavy seas.7:13 Tightening the vang forces the boom down, reduces excessive twist, and aligns the sail's chord to minimize lateral thrust.7:50 Proper vang tension stabilizes the vessel and maximizes sail efficiency on downwind points of sail.
More from Yourbestsail
From Yourbestsail — see the channel’s boat, crew, and every analyzed video.
The Sailing Directory Newsletter
One email with the fleet's best finds — the moments, boats, and stories worth your watch time. Enter your own address to get your own copy.