This paper presents a comparative study of the raking damage to high speed craft (HSC) and conventional ships. The analysis is based on a detailed theoretical model for the raking resistance of an assembled ship bottom structure and on the idea that the impact conditions for various ship types have certain similarities. Thus, damage statistics for one ship type can be scaled to another ship type.The result of a raking damage calculation is sensitive to various uncertain parameters, such as the impact velocity and the rock height and shape. Conveniently, the paper shows that the damage scaling factor is insensitive to these uncertainties.The result of the analysis suggests that the normalised raking damage (damage length/ship length) to HSC can be expected to be 3-4 times longer than that to conventional ships. This implies that a significant part of HSC grounding accidents will produce tears in the full ship length.