ype , ▁which ▁was ▁collected ▁at ▁G ore e ▁in ▁Sen eg al ▁ ▁References ▁ ▁c land est inus ▁Category : F ish ▁described ▁in ▁ 1 9 8 9 <0x0A> </s> ▁The ▁Bo eing ▁XP - 4 ▁was ▁a ▁prototype ▁United ▁States ▁bi plane ▁f ighter ▁of ▁the ▁ 1 9 2 0 s ▁that ▁was ▁ground ed ▁perman ently ▁after ▁just ▁ 4 . 5 ▁hours ▁of ▁flight ▁testing . ▁ ▁Development ▁and ▁design ▁In ▁ 1 9 2 6 , ▁the ▁United ▁States ▁Army ▁was ▁very ▁interested ▁in ▁the ▁tur bo - super char ger ▁as ▁a ▁way ▁of ▁impro ving ▁engine ▁performance , ▁and ▁requested ▁that ▁one ▁be ▁added ▁to ▁the ▁last ▁of ▁the ▁P W - 9 s , ▁and ▁the ▁engine ▁upgrad ed ▁to ▁a ▁ 5 1 0   hp ▁Pack ard ▁ 1 A - 1 5 0 0 . ▁This ▁machine ▁was ▁designated ▁XP - 4 . ▁ ▁In ▁addition , ▁the ▁basic ▁P W - 9 ▁arm ament ▁of ▁one ▁. 5 0 ▁and ▁one ▁. 3 0 ▁cal . ▁machine ▁guns ▁in ▁the ▁nose ▁was ▁supp lement ed ▁by ▁two ▁added ▁. 3 0 ▁cal . ▁guns ▁mounted ▁under ▁the ▁lower ▁wing , ▁far ▁enough ▁out ▁to ▁be ▁outside ▁the ▁prop eller ▁arc ▁( th us ▁not ▁need ing ▁synchron ization ). ▁ ▁All ▁these ▁modifications ▁added ▁weight , ▁so ▁the ▁lower ▁wing ▁span ▁was ▁extended ▁by ▁ 9 . 5 ▁feet . ▁ ▁The ▁air plane ▁was ▁delivered ▁to ▁Wright