{"id":3522,"date":"2025-06-27T18:49:07","date_gmt":"2025-06-27T09:49:07","guid":{"rendered":"https:\/\/www.kamome-propeller.co.jp\/en\/?page_id=3522"},"modified":"2025-06-27T19:15:46","modified_gmt":"2025-06-27T10:15:46","slug":"reaction_bulb","status":"publish","type":"page","link":"https:\/\/www.kamome-propeller.co.jp\/en\/products\/rudder\/reaction_bulb\/","title":{"rendered":"KAMOME REACTION AND BULB RUDDER"},"content":{"rendered":"\n

Concept<\/h2>\n\n\n\n
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KAMOME REACTION AND BULB RUDDER is an energy-saving rudder that improves propulsion efficiency by combining a reaction rudder with bent upper and lower leading edges of the rudder blade to generate rudder thrust from the propeller slip stream, and a spindle-shaped rudder bulb fitted close to the propeller hub.<\/p>\n\n\n\n

The rudder resistance is reduced by appropriately bented  upper and lower leading edges of the rudder blade, and the spindle-shaped rudder bulb reduces the hub vortex generated by the propeller to the utmost.<\/p>\n\n\n\n

The design concept of KAMOME REACTION AND BULB RUDDER is to combine these optimally.<\/p>\n<\/div>\n\n\n\n

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Principle of reaction valve rudder<\/mark><\/h3>\n\n\n\n
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Recovery of swirling flow loss due to reaction rudder (leading edge) shape to match the propeller swirling flow.<\/strong><\/div>
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Increased wake gain by the displacement effect of bulb.<\/strong><\/div>
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Reducing hub vortex.<\/strong><\/div>
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\"\"<\/figure>\n<\/div>\n\n\n\n
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\"\"<\/figure>\n<\/div>\n<\/div>\n\n\n\n
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Using both CFD calculations and towing tank tests, the optimum shape to achieve the highest energy savings is designed.<\/p>\n<\/div>\n\n\n\n

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Tank test<\/span><\/p>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

Principle of reaction valve rudder<\/h2>\n\n\n\n
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30<\/span>% <\/span>reduction of rudder resistance<\/mark>
(compared to our conventional K-7 rudder)<\/span><\/mark><\/h3>\n\n\n\n

Due to bending the upper and lower leading edges of the rudder blade reduces rudder resistance, and the bulb reduces hub vortexes, a 30% reduction in rudder resistance is achieved.<\/p>\n<\/div>\n\n\n\n

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\"\"<\/figure>\n<\/div>\n<\/div>\n\n\n\n
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\"\"<\/figure>\n<\/div>\n\n\n\n
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Propulsion efficiency improved by 4<\/span><\/mark>%<\/mark>
<\/span> (compared to our conventional K-7 rudder)<\/mark><\/h3>\n\n\n\n

The reduction in rudder resistance due to the reaction rudder and the recovery of hub vortex energy due to the rudder bulb improve the ship’s propulsion efficiency by approximately 4%.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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Propulsion efficiency improved by 4<\/span><\/mark>%<\/mark>
<\/span> (compared to our conventional K-7 rudder)<\/span><\/mark><\/mark><\/h3>\n\n\n\n

The reduction in rudder resistance due to the reaction rudder and the recovery of hub vortex energy due to the rudder bulb improve the ship’s propulsion efficiency by approximately 4%.<\/p>\n<\/div>\n\n\n\n

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\"\"<\/figure>\n<\/div>\n<\/div>\n\n\n\n

\u203bCan also be combined with our energy-saving SG propeller.
\u203bCompatible with our K-7 H type (Hanging type), M type (Mariner type), and S type (with Shoe-piece).<\/p>\n\n\n

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<\/path><\/svg>Downloads<\/span><\/a><\/div>\n<\/div>\n\n\n\n
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<\/path><\/svg>Contact us<\/span><\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n\n<\/div>\n\n
<\/div>","protected":false},"excerpt":{"rendered":"

Concept KAMOME REACTION AND BULB RUDDER is an energy-saving rudder that improves propulsion efficiency by combining a reaction rudder with bent upper and lower leading edges of the rudder blade to generate rudder thrust from the propeller slip stream, and a spindle-shaped rudder bulb fitted close to the propeller hub. The rudder resistance is reduced […]<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":3483,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"swell_btn_cv_data":"","footnotes":""},"class_list":["post-3522","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.kamome-propeller.co.jp\/en\/wp-json\/wp\/v2\/pages\/3522","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kamome-propeller.co.jp\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.kamome-propeller.co.jp\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.kamome-propeller.co.jp\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kamome-propeller.co.jp\/en\/wp-json\/wp\/v2\/comments?post=3522"}],"version-history":[{"count":4,"href":"https:\/\/www.kamome-propeller.co.jp\/en\/wp-json\/wp\/v2\/pages\/3522\/revisions"}],"predecessor-version":[{"id":3550,"href":"https:\/\/www.kamome-propeller.co.jp\/en\/wp-json\/wp\/v2\/pages\/3522\/revisions\/3550"}],"up":[{"embeddable":true,"href":"https:\/\/www.kamome-propeller.co.jp\/en\/wp-json\/wp\/v2\/pages\/3483"}],"wp:attachment":[{"href":"https:\/\/www.kamome-propeller.co.jp\/en\/wp-json\/wp\/v2\/media?parent=3522"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}