I owned a fibreglass 1965 folkboat built by Whitby Boatworks for many years. Mine ws a 3/4 fractional rig, but later models went to masthead rigs. The boat sailed wonderfully in heavy air but was a bit of a dog in light air. As I understand it, Carl Alberg
designed the "continental" folkboat, adapting the Whitby boatworks built "continental " folkboats from the wooden scandinavian folkeboot, giving it a higher coachhouse for more interior
height, along with the enclosed modern cockpit
. Whitby, like all other builders in the fifties and sixties overbuilt them. The hull was 5/8 to 7/8" thickness alternate matt and roving. The weakness on the boats was the use of regular black iron keelbolts. On mine, I had to drill and tap for new 3/4" s/s bolts to ensure the keel didn't leave the boat.