Long-tail boats, known as “Rua Hang Yao” in Thai, are traditional watercraft in Thailand characterized by a distinctive design featuring a long, narrow hull and a propeller mounted on an extended driveshaft. These versatile boats are commonly used for transportation, fishing, and tourism. Powered by converted automotive engines, long-tail boats serve as a primary mode of transportation in coastal and island areas. They are popular among tourists for island hopping, coastal exploration, and traditional fishing experiences. Some boats are adorned with colorful decorations. While contributing to the local economy and maritime culture, concerns exist regarding the environmental impact of their engines, prompting exploration of more sustainable alternatives.