Abstract
In order to investigate the scale effect of propeller shaft of high-speed craft, hydrodynamic forces acting on the prismatic body with shafts are measured by the load cell. One of shaft is rotated by the motor to investigate the effect of rotation. Measured lift and drag coefficients of shaft are almost the same as ones of smaller shafts which were reported in the previous paper. The scale effect and the effect of rotation of shaft on hydrodyamic forces are small.