▁radi ator ▁for ▁the ▁inline ▁engine , ▁which ▁gave ▁the ▁engine ▁a ▁super f icial ▁res embl ance ▁to ▁a ▁radial ▁engine ▁and ▁to ▁the ▁very ▁similar ▁installation ▁on ▁the ▁F ock e - W ulf ▁F w ▁ 1 9 0 D , ▁which ▁used ▁the ▁same ▁J um o ▁ 2 1 3 ▁power plant . ▁ ▁The ▁extent ▁of ▁the ▁modifications ▁und erm ined ▁the ▁original ▁purpose , ▁which ▁was ▁to ▁build ▁a ▁superior ▁aircraft ▁as ▁similar ▁to ▁the ▁existing ▁B f ▁ 1 0 9 G ▁as ▁possible . ▁ ▁The ▁Me ▁ 2 0 9 ▁V 5 ▁featured ▁arm ament ▁of ▁one ▁Mot ork an one ▁engine - mount ed ▁ 3 0   mm ▁( 1 . 1 8   in ) ▁M K ▁ 1 0 8 ▁can non ▁plus ▁two ▁ 1 3   mm ▁(. 5 1   in ) ▁M G ▁ 1 3 1 ▁machine ▁guns ▁in ▁the ▁wing ▁roots . ▁The ▁V 6 ▁was ▁the ▁first ▁version ▁to ▁be ▁converted ▁to ▁use ▁the ▁J um o ▁ 2 1 3 ▁engine ▁and ▁had ▁ 2 0   mm ▁M G ▁ 1 5 1 / 2 0 ▁can non ▁instead ▁of ▁the ▁M G ▁ 1 3 1 s . ▁The ▁Me ▁ 2 0 9 H ▁V 1 ▁was ▁a ▁high - alt itude ▁variant ▁with ▁extended ▁wings ▁and ▁DB ▁ 6 0 3 ▁engine . ▁ ▁Test ing ▁The ▁program ▁met ▁a ▁swift ▁end ▁when ▁the ▁Me ▁ 2