Abstract: A propeller hub assembly comprises a driven member having an outer cylindrical housing and an inner cylindrical housing. The inner cylindrical housing is coaxially fixedly coupled and radially spaced from the outer cylindrical housing, and includes a plurality of radially inwardly directed circumferentially spaced ribs oriented parallel to an axis of the inner cylindrical housing. The propeller hub assembly further includes a driving member which comprises a cylindrical member having an axis of rotation. An opening passes through the driving member coaxial with the axis of rotation and is adapted for receiving a drive shaft. The driving member further includes a plurality of radially outwardly extending ribs oriented parallel to the axis of rotation and terminating radially at a diameter substantially equal to an inner diameter of the inner cylindrical housing.

Abstract: An electrical control system is disclosed for trimming a pair of stern motors or drives mounted side-by-side on a boat. The two drives are both jointly and independently movable through a plurality of trim positions. The system includes two trim cylinders, each coupled to one associated drive, to move its associated drive to different trim positions both jointly as well as independently of each other. An operator controlled mechanism energizes and de-energizes the two trim cylinders simultaneously to jointly vary the trim position of the two drives. Two lines, each coupled at its first end to one associated drive, independently detects both the angular trim position of its associated drive with respect to the other drive as well as detects the trim position of the two drives jointly.