The CAP Aviation CAP-23x family is a family of aircraft designed for competition aerobatics. The CAP 230 airframe was a direct development of the CAP 21 competition single seater strengthened to cope with a 300 hp (220 kW) 6-cylinder Lycoming AEIO-540 engine instead of the 200 hp (150 kW) original 4-cylinder Lycoming AEIO-360.