- 4 ▁name ▁guaranteed ▁fund ing . ▁A - 4 b ▁used ▁swe pt ▁wings ▁in ▁order ▁to ▁extend ▁the ▁range ▁of ▁the ▁V 2 ▁enough ▁to ▁allow ▁attacks ▁on ▁UK ▁cities ▁in ▁The ▁Mid lands ▁or ▁to ▁reach ▁London ▁from ▁areas ▁deeper ▁within ▁Germany . ▁The ▁A - 9 ▁was ▁originally ▁similar , ▁but ▁later ▁featured ▁long ▁og ive ▁delta ▁sh aped ▁wings ▁instead ▁of ▁the ▁more ▁conventional ▁swe pt ▁ones . ▁This ▁design ▁was ▁adapted ▁as ▁a ▁cre wed ▁upper ▁stage ▁for ▁the ▁A - 9 / A - 1 0 ▁inter cont inental ▁miss ile , ▁which ▁would ▁gli de ▁from ▁a ▁point ▁over ▁the ▁Atlantic ▁with ▁just ▁enough ▁range ▁to ▁bomb ▁New ▁York ▁before ▁the ▁pilot ▁ba iled ▁out . ▁ ▁Post - war ▁development ▁ ▁In ▁the ▁immediate ▁post - war ▁era , ▁Soviet ▁ro cket ▁engineer ▁Ale k se i ▁Is ae v ▁found ▁a ▁copy ▁of ▁an ▁updated ▁August ▁ 1 9 4 4 ▁report ▁on ▁the ▁Sil ber v og el ▁concept . ▁He ▁had ▁the ▁paper ▁translated ▁to ▁Russian , ▁and ▁it ▁eventually ▁came ▁to ▁the ▁attention ▁of ▁Joseph ▁St alin ▁who ▁was ▁intens ely ▁interested ▁in ▁the ▁concept ▁of ▁an ▁ant ip od al ▁bom ber . ▁In ▁ 1 9 4 6 , ▁he ▁sent ▁his ▁son ▁Vas ily ▁St alin ▁and ▁scient ist ▁Gr ig ori ▁Tok aty , ▁who ▁had ▁also ▁worked ▁on ▁wing ed ▁rock ets ▁before ▁the ▁war , ▁to ▁visit ▁S änger ▁and ▁I rene ▁B red