ot ely ▁or ▁by ▁a ▁pilot . ▁At ▁Sc aled , ▁it ▁is ▁known ▁as ▁the ▁Model ▁ 3 5 5 . ▁It ▁was ▁un ve iled ▁on ▁May ▁ 9 , ▁ 2 0 1 1 . ▁It ▁was ▁first ▁flow n ▁in ▁February ▁ 2 0 1 0 ▁and ▁is ▁considered ▁to ▁be ▁an ▁option ally ▁pil oted ▁vehicle ▁( OP V ). ▁ ▁Design ▁and ▁development ▁One ▁of ▁the ▁last ▁aircraft ▁designs ▁over seen ▁by ▁B urt ▁R ut an , ▁who ▁retired ▁in ▁April ▁ 2 0 1 1 , ▁the ▁Fire bird ▁is ▁a ▁medium - alt itude ▁long - end urance ▁aircraft ▁designed ▁to ▁fly ▁up ▁to ▁ 4 0 ▁hours ▁at ▁a ▁top ▁speed ▁of ▁ ▁at ▁an ▁alt itude ▁of ▁. ▁The ▁tw in - bo om ▁aircraft ▁has ▁a ▁push er ▁configuration ▁and ▁a ▁long ▁sl ender ▁( high ▁aspect ▁ratio ) ▁wing ▁with ▁a ▁very ▁slight ▁forward ▁swe ep ▁angle . ▁It ▁has ▁a ▁wings pan ▁of ▁, ▁a ▁length ▁of ▁, ▁a ▁height ▁of ▁ ▁and ▁a ▁payload ▁capacity ▁of ▁. ▁It ▁is ▁power ed ▁by ▁a ▁Ly coming ▁TE O - 5 4 0 ▁flat - six ▁p ist on ▁engine ▁and ▁has ▁a ▁maximum ▁take off ▁weight ▁of ▁. ▁The ▁aircraft ▁has ▁hard points ▁to ▁carry ▁weapons , ▁though ▁it ▁is ▁currently ▁un ar med . ▁ ▁A ▁new ▁variant ▁with ▁a ▁wings pan ▁w iden ed ▁from ▁ ▁first ▁fle w ▁in ▁March ▁ 2 0 1 8 ▁and