Thirteen knots under sail appears plausible for the Comus class because the ships combined a substantial bark rig with a reasonably efficient hull. Whether the screw could be raised clear of the water would affect how much drag the machinery imposed while sailing. The estimate therefore depends on the interaction between sail plan, hull form, and auxiliary propulsion.
Notable Point · 5:03-5:17
Comus sailing speed depended on hull and screw drag
A brief Comus-class correction weighs a 13-knot sailing claim against the ship's bark rig, efficient hull, and trailing screw.