Abstract: Trim angle sensor transmission for a marine drive arranged between a drive input and a drive output. The transmission has a rotatable input member (22) being rotatable between the angular trim limits of a marine drive, and is connected to an input (31) of a rotational output sensor (30) for detecting an angle of rotation of the input member. The output sensor (30) has electrically rotational limits which are wider than the angular limits of trimming. The transmission has a planetary gear drive including an annulus (26), a sun wheel (29), at least one planet wheel (25) and a planet carrier (24). The annulus (26) is fixed, the input member (22) is connected to the planet carrier and the sun wheel is connected to the output sensor (30), in such a way that the planetary gear drive gives a multiplication of the trim input to the output sensor (30).

Abstract: Boat propeller drive unit, comprising a frame-like carrier (1) intended to be fixedly joined to a boat transom, and a propeller rig (4) which is suspended in a fork (13) for trim and tilting movement relative to the fork about a horizontal axis (a). The fork in turn is mounted in the carrier for pivoting about a vertical steering axis (b). A pair of hydraulically operated piston cylinder devices (18,20) are pivotally joined at opposite ends to the rig (4) and to the legs (12) of the fork.

Abstract: A shock absorber for absorbing external momentary steering forces acting on a steerable stern drive for boats. The shock absorber (11) is a hydraulic piston-cylinder device which is articulated between the anti-cavitation plate (9) of the drive (3) and a fixed portion (4) of the boat.

Abstract: A boat propeller drive unit of the inboard-outboard type, having a portion securely mounted in an opening in a boat transom and adapted to be drivingly connected to a motor inboard of the transom, and having a propeller leg disposed outboard of the transom. This leg is adjustable to various angles in relation to the transom by tilting about a horizontal axis and is pivotable about an upright steering support. The drive unit comprises an inductive sensor connected to a wire passing through a central bore of the steering shaft, and a magnetic core fixedly attached to the propeller leg. The magnetic core has magnetic areas separated by non-magnetic areas, and when the magnetic core is moved under the sensor, the sensor functions as a pulse counter to count a pulse of each magnetic area is moved under it. The sensor thus provides an output signal depending on the tilting angle relative to the transom, which signal indicates that angle.

Abstract: An indicator instrument for boats with outboard drive units which can be adjusted to various angles in relation to the transom and which has an indicator, preferably an LCD which shows the angle of the drive unit within the entire adjustment range, and an indicator, preferably an LED stack, which provides a rough indication of the drive unit setting within the trim angle range.

Abstract: A boat propeller drive unit, a so-called inboard-outboard drive unit, has a sensor which senses the trim/tilting angle of the drive unit and is designed to be connected to an electrical indicator instrument on the boat instrument panel. The sensor is a potentiometer mounted in a recess in the drive unit steering shaft. A shaft mounted in a bore in the steering shaft engages the potentiometer and is joined at its lower end to a gear, which engages a toothed segment on the helmet of the drive unit. When the drive unit is tilted, the gear is rotated by the toothed segment, and the output signal of the potentiometer varies.