, ▁pil oted ▁by ▁N . D . ▁Fed ose ev . ▁In ▁ 1 9 4 1 ▁the ▁original ▁M - 1 1 ▁engines ▁were ▁replaced ▁with ▁the ▁developed ▁and ▁much ▁more ▁powerful ▁M - 1 1 ▁Ye ▁variant , ▁which ▁produced ▁. ▁ ▁The ▁upgrade ▁only ▁improved ▁the ▁maximum ▁speed ▁by ▁ 4 %, ▁but ▁the ▁ce iling ▁was ▁raised ▁by ▁ 2 5 % ▁and ▁the ▁useful ▁load ▁by ▁about ▁ 5 0 %. ▁Despite ▁its ▁promise , ▁the ▁G - 2 7 ▁did ▁not ▁go ▁into ▁production , ▁priority ▁being ▁given ▁to ▁the ▁G rib ov sky ▁G - 2 9 ▁( G - 1 1 ) ▁assault ▁gl ider . ▁ ▁Spec ifications ▁( M - 1 1 ▁engines ) ▁ ▁References ▁ ▁Category : 1 9 3 0 s ▁Soviet ▁military ▁aircraft ▁G - 2 7 ▁Category : A ircraft ▁first ▁flow n ▁in ▁ 1 9 3 9 ▁Category : T win ▁p ist on - eng ined ▁tra ctor ▁aircraft <0x0A> </s> ▁The ▁Sie ge ▁of ▁Ba ido a ▁( J uly ▁ 2 0 0 8 ▁– ▁January ▁ 2 0 0 9 ) ▁was ▁a ▁military ▁confront ation ▁in ▁which ▁the ▁Al - Sh aba ab ▁milit ia ▁laid ▁sie ge ▁to ▁the ▁headquarters ▁of ▁the ▁Som ali ▁Trans itional ▁Federal ▁Government ▁( TF G ). ▁ ▁Tim eline ▁ ▁On ▁July ▁ 8 , ▁al - Sh aba ab ▁launched ▁a ▁mid night ▁attack ▁on ▁Ba ido a ' s ▁president ial