Co-authored with Carolyn Q. Judge and published in Journal of Ship Research 57.2 (2013), pp. 75–83. This paper describes an experiment measuring properties of high-speed planing boats that effect the roll behavior of such craft. High-speed boats that plane on the water surface rather than sit low in the water are subject to a variety of instabilities and potentially dangerous behavior, and this study was part of an effort to understand such phenomena.