▁and ▁V 1 1 ▁were ▁ground ed ▁in ▁April ▁ 1 9 4 4 . ▁ ▁In ▁February ▁ 1 9 4 3 , ▁the ▁same ▁month ▁by ▁which ▁the ▁R LM ' s ▁first ▁mention ▁of ▁any ▁official ▁status ▁had ▁occurred ▁for ▁design ▁work ▁on ▁an ▁entirely ▁separate , ▁He inkel ▁He ▁ 2 7 7 - named ▁heavy ▁bom ber ▁design ▁to ▁be ▁paid ▁to ▁He inkel ' s ▁engineering ▁sh ops ▁by ▁them , ▁and ▁becoming ▁the ▁He inkel ▁firm ' s ▁Amer ik ab om ber ▁contract ▁cont ender , ▁any ▁further ▁work ▁on ▁the ▁couple d - eng ined ▁He ▁ 1 7 7 A - 2 ▁and ▁A - 4 ▁designs ▁was ▁halt ed ▁by ▁order ▁of ▁the ▁R LM . ▁The ▁four - eng ined ▁He   1 7 7 H ▁high - alt itude ▁design ▁proposal ▁had ▁gained ▁in ▁importance ▁from ▁that ▁time , ▁ev iden ced ▁by ▁Reichs mar sch all ▁Hermann ▁G ör ing ' s ▁der is ive ▁" w eld ed - t ogether ▁engines " ▁compla ints ▁in ▁August ▁ 1 9 4 2 , ▁regarding ▁the ▁He ▁ 1 7 7 ▁A - series ▁un ending ▁engine ▁problems ▁from ▁the ▁choice ▁of ▁the ▁ 1 . 5 ▁t onne - weight ▁ap ie ce ▁DB ▁ 6 0 6 ▁and ▁ 6 1 0 ▁" power ▁systems " ▁for ▁the ▁A - series ▁oper ational ▁aircraft . ▁This ▁resulted ▁in ▁a ▁tri o ▁of ▁parallel ▁programs ▁under ▁development ▁by