@article{oai:ir.kagoshima-u.ac.jp:00007878,
 author = {奈良迫, 嘉一 and 中山, 博 and 井料, 正弘},
 journal = {鹿児島大学水産学部紀要=Memoirs of Faculty of Fisheries Kagoshima University},
 month = {2016-10-28},
 note = {Concerning the characteristic effectiveness of the specially deformed rectangular cross-section Rudder, built in the ship-building yards in Kagoshima Prefecture, and adopted in Yamakawa and some other districts, there has been made no researches in ascertaining its merits in comparison with the typical stream-line cross-section Rudder used far more widely. This is the reason why a test was carried out on the steerability-comparison between the above mentioned two Rudder-models, a Rectangular Cross-section one and a Stream-line Cross-section one, with the use of the Wind Tunnel Balance newly set in our Faculty, the items ascertained are as in the following : In Rectangular Cross-section Rudder, both Lift Coefficient (C_L) and Drag Coefficient (C_D) are larger than those in Stream Line Cross-section one. But under the usual Rudder angle 10~25°, the increased percentage of the Lift Coefficient is considerably larger than that of the Drag Coefficient ; namely, under the biggest Steerability, when Reynolds number is 1.8×10^4, the increased percentage is 30% ; likewise, when 4.0×10^4, it is 23% ; when 5.9×10^4, it is 18% ; when 7.8×10^4, it is 14% ; which shows that the effectiveness of the Rectangular Cross-section Rudder is obviously higher than that of the Stream-line Cross-section Rudder, which also means that the former is superior to the latter. In this case, it is without saying that the disadvantage in the form of the Rudder Drag is accompanied inevitably. But, as is to be seen in the following table the amount of the Drag under the above mentioned Reynolds number is, at its maximum, 24%, 13%, 10%, 7% respectively. Hence, the reasonable conclusion that, at least, on board of the small sized vessels operating within narrow bays and coves, and in which Rudder effectiveness rather than the Navigation speed is necessitated, the popular use of this type of Rudder might be encouraged more widely than it is to-day.  [The rest is omitted.]},
 pages = {125--136},
 title = {風洞天秤による角型舵と流線型舵との性能比較模型試験について},
 volume = {18},
 year = {}
}