Abstract
A large scale model is considered for a micro robot imitating the bacterium with a single flagellum such as Vibrio. In order to estimate the driving force exerted to a helical screw propella (flagella propella), we made a floating scale. By use of the floating scale and I-CCD camera, we measured the driving force and the rotation rate for sevral kinds of helical screw propella. The characterstics of driving force was compared to the drag coefficient of circular cylinder in a range of Reynolds number (10)^2∿(10)^3.
