Reversing Entropy · video

What this video covers

Wind power depends on air density, not just velocity.▶ 0:00 Humid air and rain-filled air carry more mass than dry air, increasing the kinetic energy hitting the sails and potentially overpowering a boat even when anemometer readings remain moderate.▶ 0:56 Beyond density, sailors encounter several distinct wind behaviors that complicate sail trim and navigation. Shifty winds near shore require constant sail adjustment or engine use to maintain a course.▶ 2:52 Gusty conditions necessitate setting sails for the maximum wind speed, which reduces efficiency during lulls.▶ 3:21 Katabatic winds, such as those found near Sesimbra, Portugal, roll down coastal terrain at high speeds and often intensify closer to shore.▶ 4:50 Downdrafts, which can occur during squalls, strike from above rather than parallel to the water; these winds often evade anemometer detection and strike sails at ineffective angles.▶ 6:18 Navigating five miles offshore can often mitigate the impact of localized coastal katabatic effects.▶ 5:26

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