Friendship 31 sloop
There are a lot of reasons that they were as heavy as they were. Some related to the intent of thier construction which was fairly robust to take the abuse of being worked. Some had to do with workmanship which was crude and cheaply done (double sawn frames and chunk forefoots.These boats were seen as somewhat disposible.) Some weight came from the very heavy rig. Much of the weight came from carry cobblestone internal ballast. It takes a lot of ballast to get much stability out of a low density placed that high in the hull. But also as a work boat the Friendship sloops had to be able to carry a proportionately large amount of cargo.