▁( some ▁to ▁liquid - f ue led ▁aircraft ▁ro cket ▁engine ▁designs ▁from ▁Hell m uth ▁Walter ▁K G ) ▁for ▁He inkel ▁as ▁the ▁license e . ▁After ▁the ▁collapse ▁at ▁the ▁end ▁of ▁the ▁Second ▁World ▁War ▁the ▁factory ▁was ▁placed ▁under ▁public ▁administration . ▁It ▁had ▁to ▁be ▁converted ▁to ▁civil ian ▁production , ▁and ▁started ▁out ▁with ▁cook ware , ▁but ▁also ▁started ▁with ▁the ▁repair ▁of ▁railway ▁w ag ons . ▁ ▁Because ▁of ▁the ▁avail ability ▁of ▁appropriate ▁special ists ▁and ▁sk illed ▁workers , ▁it ▁was ▁decided ▁to ▁concent rate ▁on ▁the ▁production ▁of ▁dies el ▁engines . ▁The ▁first ▁product ▁was ▁a ▁ 1 5   hp ▁two - stroke ▁engine , ▁which ▁was ▁very ▁successful ▁and ▁was ▁manufact ured ▁in ▁large ▁quantities . ▁This ▁was ▁followed ▁by ▁more ▁two - stroke ▁and ▁four ▁stroke ▁models ▁of ▁engine . ▁The ▁J W ▁ 1 5 , ▁ 8 ▁TO ▁ 1 5 ▁H p ; ▁the ▁J W 2 0 , ▁ 1 5 ▁to ▁ 2 0 ▁H p ; ▁and ▁the ▁J W 2 0 M , ▁the ▁same ▁engine , ▁but ▁with ▁in ert ial ▁mass ▁d amp ing ▁to ▁counter act ▁the ▁v ibr ations ▁of ▁the ▁single ▁cyl inder . ▁The ▁company ▁was ▁now ▁pushed ▁to ▁develop ▁gener ators , ▁compress ors ▁and ▁p umps ▁of ▁the ▁same ▁quality . ▁ ▁In ▁ 1 9 5 9 ▁the ▁company ▁was ▁constit uted ▁as ▁Jen bach er ▁Werke ▁AG ,