The 15′ row catamaran now comes with sail and rig details. so there are now three possible ways of propulsion: oars, outboard and sail. see 15′ row catamaran page for. All study plans are now available for email delivery at half the price of paper plans!. We have boat plans (both yacht designs, catamaran designs and power designs) for all sizes for the amateur boat builder and professional boatbuilder..