Transom sterns are a common characteristic for military, commercial, and recreational vessels. Transom sterns offer ease of construction, greater aft deck area, and reduced resistance at higher speeds. Predicting the resistance for vessels with this type of stern is difficult due to separated flow. Viscous flow solvers have been shown to provide adequate predictions for transom flows, however the time and computational cost of these high-fidelity calculations tend to be extremely high. The separation, and eventual ventilating, are viscous processes, thus potential flow solvers are unable to make these calculations without a priori information on the elevation of the transom flows. This paper provides experimental transom flow data for a 19° deadrise hull. The model used in these experiments was previously used in an effort by Royce and Doherty in 2015. The prior effort relied on video data for visual elevation measurements, while this experiment uses sonic and impedance wave probes for the measurements. The results collected with the impedance wave probes compare favorably to the prior visual measurements. Short comings of sonic wave probes are identified and a recommendation for the use of inexpensive impedance wave probes is made for future experiments.

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