Ing Arturo Crocco and Ing Julio Constance designed the CC.20 -- "CC" for the surnames of the two engineers—which was Breda's first monoplane bomber. It was a seven-seat trimotor mid-wing monoplane powered by three 373-kilowatt (500-horsepower) Isotta-Fraschini Asso ("Ace") engines. It had a powerful defensive armament of one 25-millimeter cannon and seven 7.7-millimeter (0.303-inch) machine guns. The CC.20 prototype first flew in 1929. Test flights showed it to be very slow and to have a short range, and Breda abandoned the project.