This a partial quote from the Aquarius Sail forum regarding the evolution of the SC/ARC boats mentioned in this post. Bill Roberts stated: "The SC20 was rated at 64 and the SC20TR at 62. Then in 1992 the ARC22 comes along which is all SC20TR components, rig, sails, boards, rudders, tramp, beams, etc, with 2ft longer hulls made from SC20 hulls and this boat with spinnaker is rated at 57.1"

thom