Sail Control Videos

This page provides access to several short video clips that show sail shape changes with particular sail controls. Unfortunately, video files tend to be large and very slow to download. These particular videos are in mp4 format so that not everyone will be able to view them easily.
Click to playSizeDuration
Download it 1.9 MB 14 seconds Video - Inversion wrinkles. The effect of tensioning the sheet is to bend the mast which, when it exceeds the sail's luff curve, then inverts the sail and decreases sail depth. The only depth left is from broad seaming curves.
Download it 1.8 MB 20 seconds Video - Main sheet and sail depth. Sheeting in bends the mast which takes luff curve out of the sail and the sail flattens. When the camera moves to the right, you can see the inversion wrinkles caused when the bent mast's curve begins to approximate the luff curve of the sail. The luff curve is designed to match the mast bend so the inversion happens symmetrically.
Download it 0.6 MB 7 seconds Video - Outhaul and sail depth. The outhaul controls the depth of the lower half of the sail.
Download it 2.3 MB 27 seconds Video - Inhaul and luff round. Using the amount of the mast visible as a reference, watch the inhaul pull the lower sail forward, increasing the effective luff curve which increases the luff's roundness. This rounder entry is not as fast but is more forgiving in choppy water and air.
Download it 3.4 MB 30 seconds Video - Inhaul, bottom batten, and lower leech. Watch how the inhaul pulls cloth out of the bottom leech which decreases the bottom batten's flap angle. This opens and takes power out of the bottom part of the leech and reduces weather helm.
Download it 2.7 MB 28 seconds Video - Inhaul and outhaul working in concert. Watch how the inhaul pulls cloth out of the bottom leech which opens the bottom batten's flap angle. This takes power out of the bottom part of the leech and reduces weather helm.
Download it 6.1 MB 1 minute, 7 seconds Video - Cunningham and traveler effects on mid-leech. The cunningham pulls cloth out of the middle of the sail opening up the three middle battens. This also takes power out of the leech reducing heeling force of the wind in the sail.