11-2 内航及び近海貨物船の舵に関する一考察  [in Japanese] 11-2 A Consideration on Rudders of Cargo Ships for Inland and Adjacent Seas  [in Japanese]

The Maritime Credit Corporation has built many cargo ships for inland and adjacent seas under the joint ownership with shipping companies. An investigation on the rudders of these ships was performed on the published official data, and the results of turning tests were also analyzed. An estimation formula of tactical diameter was obtained as follaws; D_T=K・C_<BT>・B/a_R・6.13λ/λ+2.25・sin2δ_R・(0.627+0.2354V_S/√<L_<PP>>)