단순만곡형과 슈퍼-V형 전개판의 유체역학적 성능에 관한 모형실험

단순만곡형과 Super-V형 전개판의 성능을 비교하기 위하여 모형실험을 실시하였다. 모형전개판은 두께 1mm되는 철판으로써 제작하였으며, 단순만곡형은 만곡도 $12\%$ , 평면투영면적 $432cm^2$ 되게, Super V형은 횡단면의 양곡도가 어디서나 $12\%$ 되고 평면 투영면적은 $436cm^2$ 되게 하였다. 실험은 측정의 결과, 단순만곡형은 최대 유교진행각도가 $25^{\circ}$ 이고, 그 때의 전개력계수는 1.47, 항력계수는 0.42이며, Super-V형은 그것이 각각 $20^{\circ},\;1.40,\;0.40$ 으로서 유체역학적성능은 단순만곡형이 다소 우수하다고 판단된다. 【The authors carried out a model experiment to examine the hydrodynamic charactristics of the simple camber and the super-V otter board. The model otter boards are made of 1 mm thick iron plate. The simple camber otter board is made to have $12\%$ camber ratio and $432\;cm^2$ plane projected area, and the super-V otter board to have the same camber ratio as the former in every latitudinal section and almost the same plane projected area. The experiment had been done in a circular flow tank in the speed range of $0.1\~1.2m/sec$ . As a result, it is examined that in the simple camber otter board the most effective angle of attack is about $25^{\circ}$ , the shearing coefficient 1.47 and the drag coefficient 0.42, while in the super-V otter board they are about $20^{\circ}$ , 1.40 and 0.40 respectively, so that the simple camber otter board performs a little better efficiency than the super-V otter board.】