▁more ▁powerful ▁engines ▁was ▁developed ▁as ▁the ▁Ro . 5 8 . ▁ ▁Vari ants ▁Ro . 5 7 ▁ ▁Single - se at ▁f ighter ▁with ▁F iat ▁A . 7 4 ▁radial ▁engines , ▁and ▁two ▁ 1 2 . 7 ▁mm ▁B red a - S AF AT ▁machine ▁guns ▁Ro . 5 7 bis ▁The ▁d ive ▁bomb ing ▁variant ▁fitted ▁with ▁d ive ▁bra kes , ▁two ▁ 2 0 ▁mm ▁can non ▁in ▁addition ▁to ▁the ▁ 1 2 . 7 ▁mm ▁guns ▁and ▁a ▁cr utch ▁for ▁bomb s ▁up ▁to ▁ ▁under ▁the ▁fus el age ▁ ▁Oper ators ▁▁▁ ▁Reg ia ▁Aer onaut ica ▁ ▁Spec ifications ▁( Ro . 5 7 ) ▁ ▁See ▁also ▁ ▁References ▁ ▁Further ▁reading ▁Lem bo , ▁Dan iele ▁Offic ine ▁Fer ro vi arie ▁Mer id ionali ▁I MA M , ▁A erei ▁nella ▁Storia ▁magazine ▁n . 3 4 ▁Nov ▁ 2 0 0 3 , ▁D elta ▁ed itions , ▁Par ma . ▁ ▁External ▁links ▁▁ ▁Com ando ▁Sup rem o : ▁I MA M ▁Ro . 5 7 ▁▁ ▁I MA M ▁Ro . 5 7 ▁▁ ▁Italian ▁A ircraft ▁ 1 9 3 9 – 4 5 ▁ ▁Ro . 5 7 ▁Category : 1 9 3 0 s ▁Italian ▁f ighter ▁aircraft ▁Category : World ▁War ▁II ▁Italian ▁f ighter ▁aircraft ▁Category : World ▁War ▁II ▁Italian ▁ground ▁attack ▁aircraft ▁Category : A ircraft ▁first ▁flow n ▁in ▁ 1