The Sora (originally designated the ACS-100 Triathlon) was developed from the CB-10 Triathlon project designed by the Brazilian aircraft designer Cláudio Barros of the Federal University of Minas Gerais. The Sora is a two-seat side-by-side all-composite low-wing cantilevermonoplane with a conventional tail unit. It has a fixed tricycle landing gear with retractable gear as an option. It is designed to be fully aerobatic (+6g to -4g). The first flight was planned for May 2008 with delivery of the first aircraft planned for the first half of 2008.