Bottom pressures were measured on two prismatic planing hull models operating in regular waves. Testing in regular waves created repeated wave slam events, which provided information on variability of the motions, accelerations, and pressures during wave slamming events. Using a reconstructed pressure distribution based on Rosen’s method [2] and predicted pressure distributions based on empirical equations given by Morabito [3], better understanding of how the hull and water interact during wave slamming can be achieved.