PROBLEM TO BE SOLVED: To provide a vessel rudder equipped with a rudder bulb contributing to eliminate a hub eddy to increase propulsion efficiency.SOLUTION: A vessel rudder is provided comprising: a rudder blade 30 disposed coaxially behind a pusher propeller 20; a top end plate and a bottom end plate disposed at the top end part and the bottom end part of the rudder blade 30 both protruding toward right and left broadsides; and a rudder bulb disposed at a front edge part 31 of the rudder blade 30. The rudder bulb opposes a propeller boss 21 of the pusher propeller 20, the maximum diameter of the rudder bulb being about 1.20 to 1.30 times as large as the diameter of a propeller boss, suitably about 1.25 times.
【課題】ハブ渦の消去に貢献して推進効率が向上するラダーバルブを備えた船舶用舵を提供する。【解決手段】推進プロペラ20の後方の同軸心上に配設する舵ブレード30と、舵ブレード30の頂端部と底端部にそれぞれ左右両舷側に張り出して設けた頂端板および底端板と、舵ブレード30の前縁部31に設けたラダーバルブを備え、ラダーバルブは、推進プロペラ20のプロペラボス21と対向し、ラダーバルブの最大径がプロペラボス径の約1.20−1.30倍であり、好ましくは約1.25倍である。【選択図】図1
VESSEL RUDDER
船舶用舵
2015-07-23
Patent
Electronic Resource
Japanese
IPC: | B63H Schiffsantrieb oder Steuerung der Schiffe , MARINE PROPULSION OR STEERING |