Hi Guys,
Sails made in molds are not new. Back in the days before computer designed sails were possible, some sailmakers made molds to their best guess sail shapes. The sailcloth panels were laid in these molds and cut to fit like a big puzzell. Some of these "molded" sails, as they were called, were fast and other molded sails were slow. It is all tied up in the shape of the mold and the shape of the mold came from somebody's drawing board. All mold cut sails are not fast. The key is in the shape of the mold. Today a good sail designer with a computer can duplicate any mold sail shape. It is possible that the "mold surface design" came from a sail design computer program and then the mold was built to the computer print out contoures.
Bill