This data is a subset of the data from an experimental campaign (https://mhkdr.openei.org/submissions/603) to characterize the hydrodynamics and performance of a laboratory-scale oscillating surge wave energy converter (OSWEC). The device was 85 cm wide, 1.4 meters tall, and 14 cm thick and was tested in the Sea Wave Environmental Lab (SWEL) wave tank at the National Laboratory of the Rockies which is 2.5 meters wide with a water depth of 1.3 meters. The device included fifteen pressure sensors on the flap face, two 6-axis load cells at the hinge, an encoder to measure flap position, and a motor to emulate a power take-off (PTO) and absorb power. This data set consists of a single sweep through power take-off damping values with post-processed data from the pressure sensor array, in addition to flap motion, forces, and torques. A README document is provided to explain data file structure and descriptions.