What kind of ships are Vivacia, Paragon etc?

['thul]

actually, that's a bit incorrect... "Sweeps" are a form of oar, typically on relatively small ships. on ships like the black pearl, the cannon doors are conveniently placed to use as openings for sweeps. on those without, there would usually be oarlocks.

as listed on definition of "sweep" on the free dictionary:
10. Nautical A long oar used to propel a boat.