Possible Clues:

• Portable boat engine
• This can help you cross the river (2 words)
• Boat attachment (2 words)
• Part of a speedboat (2 words)
• Engine attached to a boat
• Portable engine for a boat
• Internal-combustion engine that mounts at stern of small boat
• Attachment for a fast boat (2 words)
• Boat mover (2 words)
• Propeller of vessel absent managers tie up outside back of hut