▁prepared ▁the ▁XP - 6 0 C ▁for ▁the ▁evaluation ▁at ▁P atter son ▁Field . ▁In ▁the ▁event , ▁due ▁to ▁various ▁issues , ▁the ▁XP - 6 0 C ▁performed ▁poor ly , ▁resulting ▁in ▁reduction ▁of ▁the ▁production ▁run ▁of ▁ 5 0 0 ▁aircraft ▁to ▁two ▁aircraft . ▁ ▁In ▁January ▁ 1 9 4 4 , ▁the ▁XP - 6 0 E ▁was ▁flow n ▁to ▁Eg lin ▁Field ▁for ▁official ▁tri als , ▁where ▁Army ▁Air ▁Force ▁pil ots ▁found ▁that ▁it ▁did ▁not ▁compare ▁favor ably ▁to ▁contemporary ▁aircraft ▁designs . ▁When ▁Curt iss ▁expressed ▁the ▁desire ▁to ▁abandon ▁further ▁work ▁on ▁the ▁P - 6 0 ▁series , ▁the ▁Army ▁Air ▁Forces ▁ins isted ▁upon ▁completion ▁of ▁one ▁of ▁the ▁two ▁aircraft ▁in ▁production . ▁The ▁aircraft ▁when ▁originally ▁ordered ▁was ▁designated ▁Y P - 6 0 A - 1 - C U ▁and ▁was ▁red es ign ated ▁Y P - 6 0 E . ▁This ▁aircraft ▁fle w ▁on ▁ 1 3 ▁July ▁ 1 9 4 4 ▁and ▁was ▁subsequently ▁delivered ▁to ▁Wright ▁Field . ▁The ▁Y P - 6 0 E ▁differ ed ▁mainly ▁from ▁the ▁XP - 6 0 E ▁by ▁being ▁power ed ▁by ▁a ▁ 2 , 1 0 0   hp ▁( 1 , 5 6 6   k W ) ▁R - 2 8 0 0 - 1 8 ▁engine ▁as ▁well ▁as ▁the ▁fitting ▁of ▁an ▁all - around ▁vision ▁b ubble ▁can opy .