Outboard motors are generally installed at the stern of small and medium-sized kayaks and yachts as power propulsion.

Although the density of aluminum is lower than that of steel, its strength is quite remarkable, even comparable to high-quality steel, not to mention compared with fiberglass. Aluminum has a low density but high strength, is more impact-resistant and safer, making it suitable for ocean voyages and dangerous environments. Fiberglass, full name Glass Fiber Reinforced Plastics, is a composite material reinforced by glass fibers. When the hull is impacted with the same force, a fiberglass yacht may be severely damaged, while an aluminum alloy yacht may only suffer minor dents. This is why ocean-going vessels mostly use aluminum and steel materials. When sailing in dangerous environments such as icebergs, aluminum yachts can provide stronger safety guarantees. Not only that, aluminum yachts also show their advantages when encountering other possible impact obstacles, such as underwater reefs, floating wood and containers at sea. We often hear stories like this: after an aluminum yacht hits a reef, although the personnel are trapped for several days, they can finally be safely rescued. This is because when the aluminum yacht is impacted, the dented part is not easy to break and leak water, and it is relatively easy to repair. In contrast, the fate of a fiberglass yacht after running aground may be very different.