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The reduction of the frictional resistance can be possible by injecting micro bubbles along ship hull. So far, we have carried out many experiments of drag reduction due to micro-bubbles using a small high speed water channel and 50m-long flat bottom ship towed in 400m towing tank, and the drag reduction is surely obtained.Based on these experiments, we carried out a full-scale ship experiment of micro-bubbles as a promising drag reduction device. In the paper, we introduce the outline of the experiment and show the behaviors of injected micro-bubbles observed through totally 12 underwater cameras set around the ship.

Observation of traces of micro-bubbles injected in flows of full-scale cement carrier