| 摘要 |
PURPOSE:To eliminate the interference of air flowing out from an air reservoir recess with propellers, by parallelly providing two shafts and two rudders to the outside of the air reservoir recess hollowly provided to the bottom of a ship for decreasing frictional resistance between the ship and water. CONSTITUTION:Propeller shafts and propeller supporting parts 13 are formed in a squared 2 state to both sides of an air reservoir recess 2, and propellers 7 and rudders 16 are equipped to their rear tails. A width B1 of a rear end edge 10 of the recess 2 is arranged equal to or limited not larger than a distance B2 between the two shafts. By this constitution, air flowing out to the rear from the recess 2 rises along stream lines 14 formed along a ship bottom 12 never to flow in a surface of the propeller 7, and cavitation is never caused in the propeller 7. |
