David A Hagstrom, Age 651986 Junction Rd, Strasburg, VA 22657

5113780, May 19, 1992

Aug 30, 1990

7/575193

Blake J. Bennett - Boca Raton FL
David A. Hagstrom - Endicott NY

Bennett Marine, Incorporated - Deerfield Beach FL

B63B 3906

114286

A boat trim control system that includes a pair of trim tabs pivotally mounted to the stern of a boat hull, and an engine responsive to application of electrical ignition power for powering the boat through the water. A pair of fluid actuators extend between the hull and the respective trim tabs for selectively and adjustably moving the tabs between fully extended and fully retracted positions. A fluid drive is responsive to a boat operator for selectively adjusting positions of the trim tabs independently of each other to maintain a desired attitude of the boat hull. Electronic control circuitry is responsive to removal of ignition power from the engine for operating the fluid drive and energizing the actuators for a predetermined time duration so as to move boat trim tabs to the fully retracted positions upon removal of ignition power from the engine.

4742794, May 10, 1988

Sep 8, 1986

6/904672

David Hagstrom - Endwell NY

Bennett Marine, Inc. - Deerfield Beach FL

B63B 122

114286

A trim tab indicator system comprising a pair of trim members hinged to the stern of a boat, one of each side of the center line of the boat and a hydraulic cylinder individual to each trim member having a first head at one end and a second head at the other end. The cylinder includes a piston and a tubular shaft connected to the piston and extending through the first end of the cylinder. A bracket is connected to the first head and has a surface complementary to the transom of the boat and is mounted on the transom. A tubular coil is fixed on the first head and extends axially within the cylinder, and a floating rod of magnetically permeable material is provided in the tubular shaft with a lower end engaging the base of the tubular opening of the shaft with its upper end extending into the coil such that movement of the trim tab changes the inductive relationship between the rod and the coil to provide a signal representing the position of the tab.

5385110, Jan 31, 1995

Sep 7, 1990

7/579400

Blake J. Bennett - Boca Raton FL
David A. Hagstrom - Endicott NY

Bennett Marine, Incorporated of Deerfield Beach - Deerfield Beach FL

B63H 512

114285

A boat trim control system that includes a boat having a bull and means such as trim tabs mounted to the hull for trimming attitude of the boat as the bull is propelled through the water. The system includes facility for selectively adjusting the trim tabs to maintain a desired boat attitude under varying load and sea conditions. A sensor is mounted on the boat hull to provide an electrical sensor signal as a function of boat attitude, and is connected to electronic control circuitry responsive to the sensor signal for determining attitude of the boat bull. This electronic control circuitry further includes facility for operator setting of a desired boat attitude. The electronic control circuitry is coupled to an operator display for indicating departure of actual boat attitude indicated by the sensor from the boat attitude desired by the operator, and/or to automatic control circuitry for automatically varying trim tab orientation with respect to the boat bull so as to maintain the boat attitude desired by the operator.