Intended to use the new 24-cylinder Pratt & Whitney X-1800 engine, this proposal, which was for an aircraft substantially similar to the P-38, was assigned the designation XP-49, while the competing Grumman Model G-46 was awarded second place and designated XP-50.
Dimaksudkan untuk penggunaan mesin Pratt & Whitney X-1800 baru 24-silinder, proposal ini, yang untuk pesawat besar serupa dengan P-38, ditugaskan penunjukan XP-49, sementara pesaingnya Grumman Model G-46 dianugerahi tempat kedua dan ditunjuk XP-50.