| 摘要 |
PROBLEM TO BE SOLVED: To provide a propulsion and turning device of a radio control boat, which allows turning in a small radius while securing a large thrust force.SOLUTION: A screw of a radio control boat has a two-stage structure consisting of a preceding stage propulsive screw 11 and a following stage propulsive screw 12 which are rotated mutually in opposite directions. Parts of the preceding stage and following stage propulsive screws 11, 12 are located on the water, and parts of propulsive screw blades 11a, 12a are exposed above the water. Further, auxiliary screw blades 9d, 10d are assembled within the preceding stage and following stage propulsive screws 11, 12, and a flow straightener 13 is mounted on the rear of the following stage propulsive screw 12. |
