itude , ▁the ▁speed ▁could ▁be ▁maintained ▁by ▁short ▁burst s ▁of ▁the ▁lower ▁Mar sch of en ▁cru ise ▁chamber . ▁ ▁The ▁question ▁of ▁what ▁form ▁of ▁Walter ▁ 1 0 9 ▁or ▁ 1 0 9 s ▁is ▁not ▁ade qu ately ▁addressed ▁here . ▁ ▁In ▁an ▁oper ational ▁use ▁the ▁plane ▁would ▁then ▁gli de ▁over ▁England ▁for ▁a ▁photo - re con na issance ▁run , ▁desc ending ▁as ▁it ▁fle w ▁but ▁still ▁at ▁a ▁high ▁speed . ▁After ▁the ▁run ▁was ▁complete ▁the ▁engine ▁would ▁be ▁briefly ▁turned ▁on ▁again , ▁to ▁raise ▁the ▁alt itude ▁for ▁a ▁long ▁low - speed ▁gli de ▁back ▁to ▁a ▁base ▁in ▁Germany ▁or ▁northern ▁France . ▁ ▁Pro totype ▁construction ▁Since ▁the ▁aircraft ▁was ▁to ▁be ▁of ▁all - met al ▁construction , ▁the ▁D FS ▁lack ed ▁the ▁facilities ▁to ▁build ▁it ▁and ▁construction ▁of ▁the ▁prototype ▁was ▁assigned ▁to ▁Sie bel ▁Werke ▁located ▁in ▁Halle , ▁where ▁the ▁first ▁wind t unnel ▁models ▁and ▁partially ▁built ▁prototype ▁were ▁captured ▁by ▁the ▁adv ancing ▁Red ▁Army . ▁ ▁Post - W ar ▁On ▁ 2 2 ▁October ▁ 1 9 4 6 , ▁the ▁Soviet ▁OK B - 2 ▁( Des ign ▁Bureau ▁ 2 ), ▁under ▁the ▁direction ▁of ▁Hans ▁Rö ss ing ▁and ▁Alexand r ▁Bere z ny ak , ▁was ▁task ed ▁with ▁continu ing ▁its ▁development . ▁The ▁captured ▁D FS ▁ 3 4 6 , ▁now ▁simply ▁called ▁" Sam oly