A rational design method on propeller current meters that has a wide range of application to various fluids such as air, water, and oil is described. First, the runner characteristics were analyzed using the previously derived basic equations [6]. Next, many sorts of runners were tested in streams, such as the water tunnel, the oil tunnel, the wind tunnel, and the lowing tank. From these results, a general meter calibration formula, which is applicable to various fluids, was derived. If we use the basic equations, the characteristic equations and this calibration formula as the fundamental equations of the meter design, we can design current meter runners applicable to various fluids.

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