QUESTION: How does a Rudder/Skeg Combination help create strong directional stability? |
ANSWER: A large full length skeg (which is structural) directly attached to a hull, is analogous to feathers attached to an arrow shaft. Both act as stabilizers helping to maintain a consistent and true course. |
Directional Stability Increased with Full Skeg |
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From Yacht Designed Explained by Steve Killing, Douglas Hunter |
“The skeg, which sits solidly in front of the rudder, performs two functions-- [...] The real benefit of a skeg rudder is the increased tendency of the boat to travel in a straight line. Because the skeg is like a fixed rudder on centerline, it helps maintain a straight course in lumpy waves, with the rudder itself used only for course corrections.” |
From “Offshore Yachts” by John Rousmaniere |
“Second, directional stability is improved by the skeg because tit acts like tail feathers well aft of the center of gravity. The dorsal-type fin forward of many skeg-mounted rudders also acts as a stabilizing factor [...].” |