The traditional outrigger logboats of Sri Lanka, many destroyed in the 2004 tsunami, have largely been replaced by fibreglass clones. Among the many traditional variants, the prawn logboats of Negombo, with their unique spritsail rig, are the subject of this study. An account of crew-drills is offered, based on personal observation, together with a description of its rig, data on its performance under sail and an examination of its stability characteristics.