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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

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.

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1. A portable propulsion system for a watercraft, comprising: a shaft having a prop end section, a drive end section, and a rotational axis extending from the prop end section to the drive end section;a driver;a propeller coupled to the driver, the propeller being associated with the shaft and conne

1. A portable propulsion system for a watercraft, comprising: a shaft having a prop end section, a drive end section, and a rotational axis extending from the prop end section to the drive end section;a driver;a propeller coupled to the driver, the propeller being associated with the shaft and connected to the prop end section, and wherein the drive end section is configured for removable connection to the driver to facilitate rotation of the propeller via rotation of the shaft about the rotational axis to propel the watercraft;an outer casing disposed around the shaft;a flexible strap having a first end section and a second end section, the first end section being connectable to the outer casing in a first region distal the drive end section of the shaft, the second end section being coupled to the outer casing in a second region proximal the drive end section of the shaft;wherein the first end section of the strap is operable between a connected position and a towing position, the connected position corresponding to the first end section of the strap being connected to the outer casing in the first region to form a circuit in the portable propulsion system, the towing position corresponding to the first end section being disconnected from the outer casing in the first region for connection to the watercraft;wherein the first end section of the strap includes an adjustable first loop;wherein the first loop surrounds the outer casing in the first region when the first end section is in the connected position;wherein moving the first end section of the strap from the connected position to the towing position involves loosening the first loop, and sliding it from the first region to the second region and over the drive end section of the shaft;wherein the second end section of the strap is coupled to the outer casing in the second region when the first end section of the strap is in at least one of the connected and towing positions;foam disposed around the outer casing, the foam extending between the first and second regions; andwherein the second loop is sandwiched between the outer casing and the foam. 2. The system of claim 1, wherein the foam has opposing first and second edge sections, with the first edge section being proximal the first region and the second edge section being proximal the second region, the second loop being sandwiched between the outer casing and the second edge section, the first loop being disposed between the outer casing and the first edge section when in the connected position. 3. A portable propulsion system for a watercraft, comprising: a shaft having a prop end section, a drive end section, and a rotational axis extending from the prop end section to the drive end section;a propeller connected to the prop end section of the shaft, the drive end section being 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;an outer casing disposed around the shaft;a flexible strap having first and second end sections connected to the outer casing in respective first and second regions;a first section of foam disposed on the outer casing and extending between the first and second regions; andwherein the second end section of the strap is sandwiched between the first section of foam and the outer casing in the second region. 4. The system of claim 3, wherein the strap is configured to press against the first section of foam. 5. The system of claim 4, wherein the strap is configured to continuously contact the first section of foam between the first and second regions. 6. The system of claim 5, wherein the strap is operable between a narrow-circuit position and a wide-circuit position, the narrow-circuit position corresponding to the strap continuously contacting the first section of foam between the first and second regions, the wide-circuit position corresponding to the strap pulled away from a central section of the first section of the foam disposed between the first and second regions to widen a circuit formed by the strap and the outer casing.