平板の摩擦抵抗に關する一問題
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概要
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The author investigated the resistance of thin parallelogram plates and found that in the case of complete immersion the amounts of frictional resistance are quite the same as those of rectangular plates having the same nature of surface, length and wetted surface area, while in the case of partial immersion, the resistance of parallelogram plates is generally less than that of rectangular plates, and the frictional resistance of the former is proportional to е^<-aθ>, where θ is the inclination of fore and after edges to the perpendicular in degrees and a is a numerical constant. Thus, for partially immersed thin parallelogram plates, Admiral Hiraga's formula for the frictional resistance must be rewritten as follows : - [numerical formula] where R_f=frictional resistance in kg, K=coefficient of frictional resistance, S=wetted surface area in m^2 x=lower edge effect in m, d=draught in m, V=speed in m/sec, θ=angle of inclination of fore and after edges of the plate in deg., m=a constant having value of 0・000555,t=temperature correction factor Considering from the results of this investigation it seems that the existing method of estimating the frictional resistance of ships admits of some improvements.
- 社団法人日本船舶海洋工学会の論文
- 1940-04-10
著者
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