The water-cooled 700 engine performs excellently. It has an excellent power-to-weight ratio and can generate powerful power despite its relatively light weight. Specifically, the engine can provide the drone with strong and stable power output. Whether it needs to take off quickly, climb to high altitudes, or maintain high-speed cruising, the water-cooled 700 engine can handle it with ease. Taking some application scenarios as an example, the take-off weight of equipped with this engine can reach a relatively high level. For example, in some plant protection drone applications, the take-off weight can reach 53KG and the operating load can reach 20kg. This allows the engine to carry more pesticides, materials and other payloads, greatly improving operating efficiency.