That's it. Speed is roughly determined by hull length, which a Frigate can match, sail plan, which can be roughly identical on a Frigate, sail area, which can be similar though lower on the Frigate, hull form, where the Frigate has the advantage with potentially much less beam, and tonnage where the frigate has a substantial advantage.Captain Seafort wrote:That's not how I read it. As far as I can tell, his argument is simply that the ships of the line were much bigger and heavier but had similar sail areas, and were therefore slower.
For what it's worth, wikipedia gives the speed of the Victory at 8-9 knots but the Constitution at 13 knots. You're welcome to find other information in case, I don't know, the Constitution's number was from some time it was running from a hurricane or is just wrong. While those numbers don't indicate speed to different points of wind, since they have nearly the same sail plan I'd expect the relative difference to be similar at all points.