Note
This paper examines the affects of various turning thruster locations on the turning rate of the JOHNSON-SEA-LINK III Observation Submersible. A mathematical model was developed to predict the overall drag coefficient of the submersible while it was rotating with a constant angular velocity. This valve was experimentally checked by tests on a 1/12 scale model of the submersible, which was rotated in a tank of water at the corresponding Reynolds number.