Based on the John Barnett designed Butterfly to race with other 12 foot scow classes. Later built by Hydrostream Boats, who produced it under the model name FOX.

A one-design class local to the city of Charleston and the Sea Islands of South Carolina, USA.
Trapeze permitted for racing. No spinnaker.

The SONNET is 2 person one-design racing dinghy (with a scow type hull), originally intended for the home builder (a fiberglass version was also available for a few years), mostly seen in South Africa.

Originally intended for the home builder using 4 standard (4×8) sheets of plywood. At one time, active fleets existed in South Africa, Germany, and Holland.
One trapeze permitted.

The DABCHICK is a trainer, originally designed for the home builder, sailed in South Africa and Australia.

LOA above is from a Barnett Boat Company brochure. Current builder, Windward Boatworks, lists LOA: 12′ 2″ to extensions of rub rail.