</s> ▁The ▁Dist rib utor ▁Wing ▁D W - 1 ▁was ▁a ▁prototype ▁agricult ural ▁aircraft ▁of ▁un orth odox ▁design , ▁designed ▁by ▁Ken ▁Raz ak ▁in ▁the ▁United ▁States ▁and ▁market ed ▁by ▁Aer ial ▁Dist rib utors ▁in ▁the ▁ 1 9 6 0 s . ▁ ▁Design ▁Develop ed ▁with ▁assistance ▁from ▁NASA , ▁the ▁University ▁of ▁W ich ita ▁and ▁the ▁University ▁of ▁Rob b ins , ▁California , ▁the ▁aircraft ▁was ▁unusual ▁in ▁that ▁it ▁had ▁a ▁second ▁engine ▁mounted ▁directly ▁below ▁its ▁main ▁power plant , ▁using ▁this ▁second ▁motor ▁to ▁power ▁a ▁distribution ▁system ▁that ▁used ▁com pressed ▁air ▁to ▁carry ▁dry ▁chemical s ▁from ▁a ▁ho pper ▁and ▁blow ▁them ▁out ▁of ▁the ▁trailing ▁edges ▁of ▁its ▁wings , ▁over ▁the ▁f laps . ▁V ary ing ▁the ▁power ▁of ▁this ▁blow er ▁engine ▁also ▁provided ▁lift ▁control . ▁ ▁Fl ight ▁testing ▁and ▁can cellation ▁First ▁flow n ▁on ▁January ▁ 3 0 , ▁ 1 9 6 5 , ▁the ▁D W - 1 ▁was ▁flight ▁tested ▁over ▁several ▁years , ▁with ▁the ▁cow ling ▁being ▁re vised ▁during ▁testing . ▁Development ▁was ▁terminated ▁by ▁economic ▁conditions ▁in ▁the ▁fert il izer ▁market . ▁ ▁Spec ifications ▁( Produ ction ▁D W - 1 ) ▁ ▁See ▁also ▁ ▁References ▁ ▁External ▁links ▁▁ ▁Ph oto ▁at ▁aer of iles ▁ ▁D W - 1 ▁Category : Ab andon ed ▁civil ▁aircraft ▁projects ▁of ▁the ▁United ▁States ▁Category : 1 9 6