▁total ▁of ▁three . ▁ ▁Development ▁The ▁R U - 3 8 ▁was ▁intended ▁to ▁ful fill ▁both ▁the ▁low ▁alt itude , ▁quiet , ▁over ▁water / host ile ▁terrain ▁reconna issance ▁role ▁and ▁also ▁the ▁high ▁alt itude ▁st ando ff ▁surve ill ance ▁role . ▁ ▁The ▁design ▁miss ions ▁for ▁the ▁R U - 2 3 A ▁were : ▁Border ▁integrity ▁C ounter - ter ror ism ▁surve ill ance ▁D rug ▁enfor cement ▁Electron ic ▁intelligence ▁Fish ery ▁pat rol s ▁Il legal ▁al ien ▁surve ill ance ▁Int elligence ▁collection ▁Mar itime ▁pat rol ▁Pol l ution ▁pat rol ▁& ▁environmental ▁monitoring ▁Search ▁and ▁Res cue ▁ ▁In ▁converting ▁to ▁the ▁new ▁R U - 3 8 A ▁configuration , ▁the ▁conventional ▁R G - 8 A ▁air frame ▁was ▁greatly ▁modified ▁by : ▁Rem oving ▁the ▁single ▁ 2 3 5   hp ▁( 1 7 5   k W ) ▁Ly coming ▁O - 5 4 0 - B ▁power plant ▁Install ing ▁two ▁Te led y ne ▁Cont inental ▁Mot ors ▁G IO - 5 5 0 A ▁engines ▁with ▁a ▁ 3 : 2 ▁g ear ▁reduction ▁to ▁ 2 2 6 7 ▁operating ▁r pm . ▁The ▁engines ▁are ▁mounted ▁one ▁in ▁the ▁nose ▁and ▁the ▁other ▁in ▁the ▁rear ▁of ▁the ▁fus el age . ▁En larg ing ▁the ▁crew ▁compart ment ▁Im pro ving ▁the ▁engine ▁m uff lers ▁In cre asing ▁the ▁wings pan ▁from ▁ 5 6 .