9 ▁is ▁an ▁Argent ine ▁experimental ▁ta ill ess ▁aircraft ▁power ed ▁by ▁a ▁Rot ax ▁ 4 4 7 ▁engine . ▁ ▁Design ▁and ▁development ▁The ▁P UL ▁ 9 ▁had ▁its ▁orig ins ▁in ▁Argentina , ▁the ▁home ▁of ▁the ▁German ▁flying ▁wing ▁pione er ▁Re imar ▁H orten ▁since ▁ 1 9 4 8 . ▁ ▁In ▁late ▁ 1 9 8 9 ▁a ▁collaboration ▁between ▁H orten ▁and ▁Sieg fried ▁Pan ek ▁produced ▁a ▁design ▁for ▁a ▁single ▁seat , ▁single ▁push er ▁engine ▁ta ill ess ▁aircraft . ▁ ▁The ▁name ▁was ▁an ▁ac ron ym ▁of ▁Pan ek ▁Ult ra Light , ▁with ▁ 9 ▁the ▁span ▁in ▁metres . ▁ ▁Const ruction ▁began ▁near ▁Frankfurt , ▁Germany ▁in ▁January ▁ 1 9 9 0 ▁but ▁was ▁transferred ▁to ▁the ▁Italian ▁company ▁N ike ▁Aer onaut ica ▁in ▁the ▁spring . ▁The ▁P UL   9 ▁first ▁fle w ▁on ▁ 2 2 ▁June ▁ 1 9 9 0 . ▁ ▁It ▁had ▁ 3 0 ° ▁of ▁swe ep ▁on ▁the ▁leading ▁edges ▁of ▁its ▁thick ▁( thick ness / ch ord ▁ratio ▁ 2 0 % ), ▁symmetric ▁aer of o il , ▁wings , ▁built ▁using ▁carbon ▁fib re ▁and ▁Ke v lar ▁with ▁glass f ib re ▁for ▁the ▁sp ars . ▁The ▁wing ti ps ▁were ▁rounded , ▁with ▁was h out . ▁E lev ons ▁controlled ▁both ▁pitch ▁and ▁roll ; ▁there ▁was ▁no ▁vertical ▁stabil izing ▁surface , ▁rud der