Mailport & PS Advisor

PS Advisor: Cure for the Ventilating Rudder

Got a really fast boat? Zipping along at over 10 knots there are any number of ways air can suck down the leeward side of the blade, spoiling the coanda effect. When planing there are often some air bubbles under boat. If the boat assumes a bow-down attitude under the pressure of the spinnaker or as waves pass, the transom can come a few inches out of the water. Above 15 knots there’s enough suction…

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