▁it ▁is ▁possible ▁that ▁one ▁or ▁two ▁large - cal ib re ▁mach in eg uns ▁would ▁have ▁been ▁used . ▁ ▁At ▁the ▁end ▁of ▁the ▁war ▁even ▁the ▁prototype ▁DM - 1 ▁test ▁gl ider ▁had ▁not ▁been ▁finished ▁when ▁it ▁was ▁captured ▁by ▁American ▁forces . ▁The ▁Americans ▁ordered ▁Li pp isch ' s ▁team ▁to ▁complete ▁the ▁gl ider , ▁and ▁it ▁was ▁then ▁sh ipped ▁to ▁the ▁United ▁States ▁where ▁it ▁was ▁test - flow n . ▁According ▁to ▁the ▁National ▁Ad vis ory ▁Committee ▁for ▁Aer onaut ics ▁the ▁results ▁were ▁positive ▁and ▁less ons ▁learned ▁were ▁incorpor ated ▁into ▁NASA ' s ▁research ▁aircraft ▁of ▁the ▁ 1 9 5 0 s ▁and ▁on . ▁ ▁Film ▁foot age ▁exists ▁which ▁shows ▁a ▁gl iding ▁test ▁of ▁a ▁scale d - down ▁model ▁of ▁the ▁P . 1 3 a . ▁These ▁tests ▁began ▁in ▁May ▁ 1 9 4 4 ▁at ▁Sp itzer berg , ▁near ▁Vienna . ▁ ▁Vari ants ▁ ▁A ka fl ieg ▁D arm stadt / A ka fl ieg ▁München ▁DM . 1 ▁- ▁A K A ▁Li pp isch ▁DM . 1 ▁A ▁scale ▁flying ▁wind ▁tunnel ▁gl ider ▁version ▁of ▁the ▁proposed ▁Li pp isch ▁P . 1 3 a ▁ ▁Li pp isch ▁P . 1 3 b ▁- ▁a ▁further ▁development ▁of ▁the ▁P . 1 3 a , ▁which ▁never ▁came ▁beyond ▁the ▁drawing ▁board . ▁ ▁The ▁P . 1 3 a ▁was ▁completely