They were of the same type as used in other projects such as the Re.2000, and drove two three-blade, continuous-speed 3.2 m (10.4 ft) diameter Breda propellers. The engine nacelles also carried the two main undercarriage units. The aircraft had a twin tail to provide the dorsal 7.7 mm (0.303 in) Breda-SAFAT machine gun with a better field of fire.