Recently purchased a Mark 3 15'5" Zodiac inflatable. Have 25 hp Merc. Had motor on a 11'2" Seaworthy inflatable that would occasionally spin out (cavitate) when in rougher water. Seaworthy had a mimimal keel. Zodiac has a significant keel giving a more v-hull effect. Had the Zodiac on the lake for the first time prior to upcoming ocean trip this weekend and it would cavitate all the time. Could never really get much of a high end speed before it would spin. The transom height is 15" and the front of cavitation plate is level with the bottom with the back of the plate raising 1/2 inch. The former owner had drilled 4 holes in the cav plate and had installed a foil type device that slows the boat speed down for troling. Removed the foil but 4 hole remain? The angle of the motor is the the 2nd hole closest to the transom. Any thoughts or suggestion to my problem?
