Fig. 6. (A) Drag force experienced by models as a function of EI at the highest unidirectional flow speed (0.73 m s^-1) for all models (excluding rigid models). Values are means ± s.d., N=6. Values for extra-buoyant and non-buoyant models fall above and below the best-fit logarithmic trend lines fit to data from buoyant models, respectively. (B) The maximum force experienced by models in waves for all models excluding rigid models (means ± s.d., N=6). Values for extra-buoyant and non-buoyant models fall above the best-fit logarithmic trend lines fit to data from buoyant models.