American experimental high altitude fighter design from 1942. To speed up development the design utilised various of-the-shelf airframe components together with a new 24-cylinder engine mounted behind the pilot driving contra-rotating propellors. The combination of mis-mathched aerodynamics and unproven engine was not a happy one and performance was disappointing.
By the time the XP-75 was flyable the US needed a long-range escort more than a high altitude interceptor and the entire design was revised as the XP-75A which appeared very similar but included many detail changes. The success of the Mustang removed the need for the Eagle and the project was cancelled in late 1944.
The spherical recess underneath the model is for mounting it on a 6mm BB.