8 - 2 7 7 ▁air frame ' s ▁design ▁work ▁had ▁been ▁progress ing ▁at ▁the ▁He inkel - S ud ▁facility ▁in ▁Vienna ▁from ▁before ▁that ▁time , ▁the ▁general ▁arrangement ▁" Typ en blatt " ▁draw ings ▁for ▁the ▁never - comple ted ▁He ▁ 2 7 7 , ▁with ▁a ▁design ▁influence ▁for ▁the ▁fus el age ' s ▁geometry ▁from ▁the ▁smaller ▁He inkel ▁He ▁ 2 1 9 ▁night ▁f ighter , ▁show ▁that ▁it ▁had ▁also ▁adopted ▁many ▁features ▁from ▁the ▁He ▁ 2 7 4 , ▁especially ▁its ▁tw in ▁tail . ▁The ▁He inkel ▁entry ▁for ▁the ▁Amerika ▁Bom ber ▁competition ▁would ▁itself ▁end ▁up ▁being ▁cancel led ▁on ▁April ▁ 2 0 , ▁ 1 9 4 4 , ▁with ▁not ▁one ▁completed ▁air frame ▁to ▁show ▁for ▁it . ▁ ▁Character istics ▁ ▁Major ▁differences ▁between ▁the ▁He ▁ 2 7 4 ▁and ▁the ▁He ▁ 1 7 7 ▁A ▁were ▁abandon ment ▁of ▁the ▁tw in ▁couple d ▁" power ▁system " ▁engine ▁arrangement ▁in ▁favor ▁of ▁four ▁independent ▁DB ▁ 6 0 3 A - 2 ▁fully ▁unit ized ▁engines , ▁co o led ▁by ▁ann ular ▁radi ators ▁nearly ▁identical ▁in ▁appearance ▁to ▁those ▁on ▁the ▁similarly - power ed ▁He inkel ▁He ▁ 2 1 9 ▁night ▁f ighter ▁as ▁an ▁integral ▁part ▁of ▁each ▁" unit ized " ▁engine ' s ▁installation , ▁an ▁extended ▁rear ▁fus el age ▁with ▁a ▁tw in ▁tail ▁fin ▁emp enn