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 cantilever monoplane 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.