Quote Originally Posted by Fisherking View Post
Royal Navy Rating System

Ship of the line 1st Rate 100 +Guns 3Gun decks + forecastleand quarterdeck 850 to 875Crew 2000 tons+

Ship of the line 2nd Rate 90 to 98Guns 3 Gun decks+ forecastle and quarterdeck 700 to 750Crew about 2000 tons


Ship of the line 3rd Rate 64 to 80 Guns 2 Gun decks 500 to 650Crew 1300-1600 tons


Frigate(Razee?) 4thRate 50 to 60Guns 2 Gun decks 320 to 420Crew about 1000 tons


Frigate 5th Rate 32 to 40 Guns 1 Gun deck 200 to 300Crew 700 to 1450 tons


Frigate 6th Rate 20 to 28Guns 1 Gun deck 140 to 200 Crew 450 to 550 tons


Sloop-of-war 16 to 18 Guns Guns on deck 90 to 125 Crew 380 tons


Gun-brig and Cutter 6 to 14 Guns Guns on deck 5 to 25 Crew 220 tons

You are a bit off there. Whilst technically some razee frigates and bigger frigates carried over 50 guns they were mostly classed as 44-gun 5th rates. 4th rates were ships of the line, though only really 60 gun ships were used in the line of battle by most nations. And 5th rates also included 2 decked 44-gun cruising style vessels as well which were mostly used by the Royal Navy. 3rd rate 80-gunners could also be 3-deckers in the Royal Navy during the first half of the century.