Abstract: An assembly (300), including a hydrofoil (302), is provided for mounting on the anti-ventilation plate (14) of a sterndrive or outboard motor (16) without the need to modify the plate or motor. The hydrofoil (302) of the assembly (300) has a series of holes (308) spaced along its width to receive a series of mounting disk assemblies (304) having a stepped disk (310). A carriage bolt (314) forming a part of each mounting disk assembly (304) is placed in the hole (308) closest the edge (36, 38) of the plate (14), a stepped disk (310) is placed over the end of the bolt (314) and the hydrofoil (302) is clamped on the plate (14) by tightening nuts (316) to clamp the plate (14) between the hydrofoil (302) and step (362) of the disk (310). Friction material (312) on the mounting disk assemblies provides firm engagement with the plate (14). A catch (206) can be mounted between the hydrofoil (302) and the trim tab or anode recess (76) in the plate (14).

Abstract: An assembly (10) is provided for mounting a hydrofoil, trolling plate or trolling motor (or other accessory) on the anti-ventilation plate (14) of a sterndrive or outboard motor (16) without the need to modify the plate or motor. The assembly (10) has lower and upper elements (20, 22) which are secured about the plate (14) by bolts (34). The upper element (22) has a bolt pattern (40) to mount the hydrofoil or other device. A catch (60, 88, 88a, 88b, 88c, 88d) mounted on the lower element (20) can be engaged in the trim tab or anode recess. Grip devices (50) can be mounted on the lower element (20) that are adjusted to grip the edges of the plate (14).

Abstract: An assembly (10) is provided for mounting a hydrofoil, trolling plate or trolling motor (or other accessory) on the anti-ventilation plate (14) of a sterndrive or outboard motor (16) without the need to modify the plate or motor. The assembly (10) has lower and upper elements (20, 22) which are secured about the plate (14) by bolts (34). The upper element (22) has a bolt pattern (40) to mount the hydrofoil or other device. Grip devices (50) can be mounted on the lower element (20) that are adjusted to grip the edges of the plate (14). A catch (60) mounted on the lower element (20) can be engaged in the trim tab or anode recess.