1 ▁tur bo - super char ger , ▁and ▁one ▁XP - 6 0 C ▁with ▁the ▁massive ▁Ch rys ler ▁XIV - 2 2 2 0 ▁six teen ▁cyl inder ▁invert ed ▁ve e ▁engine . ▁ ▁At ▁the ▁time , ▁avail ability ▁of ▁the ▁Ch rys ler ▁engine ▁was ▁coming ▁into ▁question , ▁and ▁after ▁Curt iss ▁noted ▁that ▁several ▁hundreds ▁of ▁pounds ▁of ▁lead ▁would ▁be ▁needed ▁in ▁the ▁tail ▁of ▁the ▁existing ▁air frame ▁for ▁balance , ▁a ▁decision ▁was ▁made ▁to ▁install ▁a ▁Pr att ▁& ▁Whit ney ▁R - 2 8 0 0 ▁radial ▁engine ▁in ▁the ▁XP - 6 0 C . ▁In ▁the ▁meant ime , ▁Curt iss ▁installed ▁a ▁Mer lin ▁ 6 1 ▁engine ▁in ▁the ▁original ▁XP - 6 0 , ▁and ▁after ▁en larg ing ▁the ▁vertical ▁tail ▁surface ▁this ▁aircraft ▁was ▁red es ign ated ▁XP - 6 0 D . ▁ ▁The ▁XP - 6 0 A ▁first ▁fle w ▁on ▁ 1 ▁November ▁ 1 9 4 2 . ▁While ▁official ▁interest ▁in ▁the ▁P - 6 0 ▁w an ed ▁during ▁summer ▁ 1 9 4 2 , ▁interest ▁due ▁to ▁the ▁promise ▁of ▁improved ▁performance ▁with ▁the ▁installation ▁of ▁the ▁R - 2 8 0 0 ▁engine ▁resulted ▁in ▁a ▁contract ▁for ▁ 5 0 0 ▁R - 2 8 0 0 ▁power ed ▁P - 6 0 A - 1 - C U ▁f igh ters ▁with ▁contra - rot ating ▁prop ellers . ▁With