![]() There should be a smooth transition in twist from the bottom of the sail to the top. The leech telltales should be flowing aft, indicating that the air is flowing smoothly over the sail. When it comes to reading leech telltales, the key is to look for the shape and twist of your sail. Adjust your sail trim appropriately to correct this issue. When the jib is trimmed too tightly for the wind to travel around, you'll see the leech telltale fluttering and stalling. They provide valuable information about how the wind is exiting the sail. Leech telltales are located off the leech of the sail. The key here is to have the ability to see them, ideally through a window, so you can always monitor at least one of the leeward telltales. Upwind, however, you should rely more on jib luff telltales, as the air around the shrouds is disturbed and less informative. On the windward side, the shroud receives relatively undisturbed air, giving you a more accurate reading of the wind's direction and shifts. Shroud telltales are most useful when sailing downwind (DDW). A discussion on SailNet Community notes that: Understanding the difference between the windward and leeward sides when reading shroud telltales can have a significant impact on your sailing performance. Windward and leeward sides of shroud telltales Make sure the telltales are made from ribbon, as this material provides better visibility and responsiveness. Shroud telltales are better than luff telltales (on the jib or mainsail) for spotting shifts, as they react instantly, and give you an idea of the shift's magnitude. When observing shroud telltales, pay attention to their movement as they respond to the wind. Visual indicators on your shroud telltales ![]() If they are flapping, you may need to adjust your sail or course to improve airflow over the boat. If they are streaming aft, your boat is in good trim. To use them effectively, pay attention to whether they are streaming aft or flapping. Usually placed on both port and starboard stays, shroud telltales inform you about the wind flow across the deck. In this section, we will discuss the visual indicators to look for, as well as the differences between the windward and leeward sides. Shroud telltales are useful for spotting wind shifts and can provide valuable information to make quick adjustments. On the contrary, if the leeward telltale is luffing, it means that your boat is pointing too high, and you should sheet out the mainsail or head up slightly to improve airflow. If you notice the windward telltale luffing, it is an indication to sheet in the mainsail or bear away slightly. Monitor the windward and leeward telltales. When the airflow is smooth and attached to the sail, the telltales will flow neatly. Luffing occurs when the airflow over the sail is not efficiently attached, causing turbulence, that makes the telltales flutter or droop. Luffing and flowing of your main sail telltales Aligning your telltales horizontally will help you more easily assess the sail's performance at a glance. A straightforward way to achieve this is by attaching them to a seam or batten pocket. Make sure that your telltales are properly aligned with each other. ![]() This placement will give you a good overview of the airflow over the sail's surface. Position your telltales about one-third of the way from the luff and two-thirds up from the foot of the sail. Yarn telltales are typically used, and they should be attached to both sides of the sail. Position and alignment of your main sail telltales When the windward telltale is fluttering, it means you need to either sheet in the jib or bear away until it stops and flows smoothly. By observing their behavior, you can determine whether you should sheet in the jib or turn the boat away from the fluttering telltale. Main sail telltales are typically attached near the luff of the sail. It means that the sail is twisted or the wind is gustingĪdjust the sail trim to remove the twist or steer the boat to a different angle to avoid the gusts Trim the sail in slightly or point the boat more away from the windĬrossing (top and bottom telltales are crossing each other) It means that the sail is stalling, or getting too much wind ![]() Stalling (bottom telltale is not lifting up) It means that the sail is luffing, or not getting enough windĮase the sail out slightly or point the boat more into the wind Luffing (top telltale is lifting up or fluttering) It means that the sail is trimmed correctly and the wind is flowing smoothly over the sail Here's a table briefing about the different positions of the different telltales, what they mean, and how you should adjust your sail.
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