Prerotation fan-shaped guide pipe for rightward rotation single-propeller boat

The utility model discloses a prerotation fan-shaped guide pipe for a rightward rotation single-propeller boat. The prerotation fan-shaped guide pipe consists of first to four blades and an arc-shaped guide plate, wherein through being seen from the back side of a propeller, the second blade and the first blade are sequentially arranged at the left side of the longitudinal center line of a propeller hub of a propeller from top to bottom, the third blade and the fourth blade are sequentially arranged at the right side of the longitudinal center line of the propeller hub of the propeller from top to bottom, the range of an included angle between the first blade and the longitudinal center line of the propeller hub is 70 degrees to 80 degrees, the range of an included angle between the second blade and the longitudinal center line of the propeller hub is 25 degrees to 30 degrees, the range of an included angle between the thrid blade and the longitudinal center line of the propeller hub is 35 degrees to 40 degrees, and the range of an included angle between the fourth blade and the longitudinal center line of the propeller hub is 70 degrees to 80 degrees. Compared with a three-blade prerotation triangular guide pipe, the prerotation fan-shaped guide pipe has the advantages that the third blade realizes the support and reinforced prerotation effect and is positioned outside a cavitation bubble sensitive region, and adverse influence cannot be caused on the cavitation bubble performance.