A portable propulsion system for a watercraft may include a shaft, a propeller, an outer casing, and a flexible strap. The shaft may have a prop end section, a drive end section, and a rotational axis extending from the prop end section to the drive end section. The propeller may be connected to the prop end section of the shaft. The drive end section may be configured for removable connection to a driver for rotation of the propeller via rotation of the shaft about the rotational axis to propel the watercraft. The outer casing may be disposed around the shaft. The flexible strap may have first and second end sections connected to the outer casing in respective first and second regions.

A shaft profile is provided for an outboard drive. The shaft profile includes a base body extending along a longitudinal axis, the base body including a receiving space configured to receive a shaft of the outboard drive; and at least three support ribs extending in a direction of the longitudinal axis and configured to radially guide the shaft, the at least three support ribs arranged on an inner side of the receiving space.

A shaft profile is provided for an outboard drive. The shaft profile includes a base body extending along a longitudinal axis, the base body including a receiving space configured to receive a shaft of the outboard drive; and at least three support ribs extending in a direction of the longitudinal axis and configured to radially guide the shaft, the at least three support ribs arranged on an inner side of the receiving space.

A marine drive comprising a powerhead that causes rotation of a driveshaft, a gearcase that supports a propulsor for propelling the marine drive in a body of water, a steering housing disposed between the powerhead and the gearcase, wherein the driveshaft or an extension thereof extends through the steering housing is operatively coupled to the propulsor, and a steering mechanism configured to steer the gearcase about a steering axis relative to the steering housing. The gearcase and steering housing are connected at a steering joint through which at least one of cooling water from the body of water is conveyed to the powerhead throughout steering movement of the gearcase and exhaust from the powerhead is conveyed to the body of water throughout steering movement of the gearcase.

A marine drive comprising a powerhead that causes rotation of a driveshaft, a gearcase that supports a propulsor for propelling the marine drive in a body of water, a steering housing disposed between the powerhead and the gearcase, wherein the driveshaft or an extension thereof extends through the steering housing is operatively coupled to the propulsor, and a steering mechanism configured to steer the gearcase about a steering axis relative to the steering housing. The gearcase and steering housing are connected at a steering joint through which at least one of cooling water from the body of water is conveyed to the powerhead throughout steering movement of the gearcase and exhaust from the powerhead is conveyed to the body of water throughout steering movement of the gearcase.

A tiller is for steering a marine vessel. The tiller has a yaw bracket configured for attachment to a marine drive, a tiller arm which is pivotable about a yaw axis relative to the yaw bracket, and a yaw lock configured to lock the tiller arm in a plurality of yaw positions relative to the yaw bracket. Unlocking the yaw lock facilitates movement of the tiller arm into a new yaw position in the plurality of yaw positions.

A tiller is for steering a marine vessel. The tiller has a yaw bracket configured for attachment to a marine drive, a tiller arm which is pivotable about a yaw axis relative to the yaw bracket, and a yaw lock configured to lock the tiller arm in a plurality of yaw positions relative to the yaw bracket. Unlocking the yaw lock facilitates movement of the tiller arm into a new yaw position in the plurality of yaw positions.

A propulsion device for a water-surface movable body includes an upper case, a propulsion motor accommodated in the upper case, a lower case supported by the upper case so as to turn around a turning axis, a propulsor supported by the lower case, a steering motor accommodated in the upper case, and a steering deceleration mechanism configured to decelerate rotation of the steering motor. The steering deceleration mechanism includes a gear shaft arranged in parallel with an output shaft of the steering motor, an output shaft gear arranged coaxially with the output shaft of the steering motor, a ring gear arranged coaxially with the turning axis, and deceleration gears interposed between the output shaft gear and the ring gear. At least one of the deceleration gears is arranged higher than the output shaft gear in a state where the turning axis extends in a vertical direction.

A propulsion device for a water-surface movable body includes an upper case, a propulsion motor accommodated in the upper case, a lower case supported by the upper case so as to turn around a turning axis, a propulsor supported by the lower case, a steering motor accommodated in the upper case, and a steering deceleration mechanism configured to decelerate rotation of the steering motor. The steering deceleration mechanism includes a gear shaft arranged in parallel with an output shaft of the steering motor, an output shaft gear arranged coaxially with the output shaft of the steering motor, a ring gear arranged coaxially with the turning axis, and deceleration gears interposed between the output shaft gear and the ring gear. At least one of the deceleration gears is arranged higher than the output shaft gear in a state where the turning axis extends in a vertical direction.

A propulsion device includes an upper case, a propulsion motor accommodated in the upper case, a lower case supported by the upper case so as to turn around a turning axis, a propulsor supported by the lower case and configured to rotate around a propulsion axis by a driving force of the propulsion motor, a deceleration mechanism provided on a driving force transmission path from the propulsion motor to the propulsor and configured to decelerate rotation of the propulsion motor, and a refrigerant supply mechanism configured to supply a refrigerant to the deceleration mechanism. The lower case includes a turning portion having a cylindrical shape centered on the turning axis, the deceleration mechanism and the refrigerant supply mechanism are arranged on an inner circumference of the turning portion, and a refrigerant suction port of the refrigerant supply mechanism is formed in the turning portion.