| 摘要 |
PROBLEM TO BE SOLVED: To provide a propeller guard capable of reducing propulsion resistance and increasing propulsion force of a vessel with a simple structure.SOLUTION: A propeller guard is disposed at a distance from a propeller 1 around the propeller to protect the propeller that propels the traveling of a vessel. The propeller guard has a double pipe structure composed of an inner member 2-2 and an outer member 2-1, and the double pipe interior formed between the inner member and the outer member is either hollow or is filled with a foam 2-3. |
