There are 20 American X-Planes in the Military Factory.
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Curtiss XP-42 The Curtiss XP-42 was a further development of the Curtiss P-36 Hawk model though it would share some initial outward similarities to Curtiss' most well known aircraft - the P-40 Warhawk. Later in its development, the XP-42 w...
Curtiss XP-46 The smallish XP-46 was to be the answer for the deficiencies encountered in the P-40 Warhawk platform. Unfortunately for Curtiss, the XP-46 would be doomed by underperformance and sluggish capabilities - essentially dooming t...
Curtiss-Wright XP-55 Ascender The XP-55 Ascender was an unorthodox attempt by the Curtiss-Wright company that produced just three prototype models. Answering a United States Army Air Corps call for unconventional aircraft designs, the XP-55 fit the bill w...
Curtiss-Wright XP-87 / XF-87 Nighthawk The XF-87 was a failed proposal attempted by the Curtiss-Wright aircraft design bureau to meet an Air Force requirement for the world's first dedicated radar interceptor aircraft crewed by two personnel and operating under je...
Fisher XP-75 / P-75 Eagle The Fisher XP-75 Eagle was a novel attempt to fulfill the role of fast-climbing interceptor for the United States Army. The system was designed with speed of production in mind and thusly was comprised of elements found on ot...
Hughes XF-11 Though only achieving prototype form, the XF-11 was one of the darling designs of famed American aviator Howard Hughes. Looking very much like an oversized Lockheed P-38, the twin-boom XF-11 was designed to fulfill a United S...
Lockheed XP-49 The XP-49 was a development of the Lockheed Corporation and a possible replacement for its successful line of P-38 Lightning aircraft. The XP-49 was to be a high-altitude performer with the capabilities of a well-designed fig...
Lockheed XP-58 Chain Lightning The XP-58 "Chain Lightning" was initially envisioned as a larger version of the successful Lockheed P-38 Lightning twin-boom design capable of downing hordes of enemy bomber formations in single burst shots. The fear covering...
McDonnell XF-85 Goblin The XF-85 Goblin was an attempt by the McDonnell bureau to realize the dream of a "parasite fighter" program that was actually feasible for use in a wartime environment. The basic theory revolving the parasite fighter was not...
McDonnell XF-88 Voodoo World War 2 proved to American warplanners that the importance of escort fighters for their bombers could not be overstated. The value added by such systems as the P-51 Mustang, P-47 Thunderbolt and P-38 Lightning systems was...
McDonnell XP-67 Bat / Moonbat The XP-67 was the first attempt by the McDonnell corporation to build a fighter for the United States Military. The same corporation would go on to built the superb F-4 Phantom II, F-15 Eagle and F-18 Hornet air superiority a...
North American YF-107 Ultra Sabre The YF-107 "Ultra Sabre" prototype represented the final foray into military aviation for the North American Aircraft Corporation. The company that was responsible for such memorable airframes as seen embodied by the P-51 Mus...
Northrop Grumman YF-23 Black Widow II The YF-23 Black Widow II was Northrop Grumman's (along with McDonnell Douglas Corporation) answer to the American ATF (Advanced Tactical Fighter challenge as proposed by the US Air Force. The YF-23 faced off directly with the...
Northrop XP-56 Black Bullet The XP-56 "Black Bullet" was designed by the Northrop company to an Army Air Corps proposal known as the R-40C. The XP-56 stood out as yet another radical design and focused on the flying wing concept while incorporating push...
Northrop XP-79 The XP-79 was another of Northrop's flying wing attempts with the initial project being conceived as a rocket-propelled model. The design was dominated by the large horizontal wing surface area with twin vertical tail surface...
Northrop YF-17 Cobra The YF-17 Cobra was a Northrop Aviation creation through NASA to support further testing and research of aircraft at transonic speeds (meaning just underneath the speed of sound, or 700-780mph / 1,127-1,255kph). The YF-17 Cob...
Republic XP-72 Super Thunderbolt (Wasp Major) The XP-72 Wasp Major Thunderbolt was intended to be an "ultimate" design of the highly successful P-47 Thunderbolt fighter-bomber as produced by Republic. The XP-72 was to incorporate the successful P-47 airframe and mate it ...
Rockwell XFV-12 The XFV-12 aircraft was a proposed Rockwell International design to a United States Navy requirement for a VTOL (Vertical Take-Off and Landing) aircraft system. Though a promising concept from the beginning, the XFV-12 was te...
Vultee XP-54 Swoose Goose The Vultee-produced XP-54 was one of the more distinguishable prototypes designed during the Second World War. Produced through an empty canvas/blank check approach by an Army Air Corps initiative, the XP-54 (later nicknamed ...
Vultee XP-81 The Consolidated Vultee XP-81 was a proposed long-range, high-altitude fighter design that was to be the answer for bomber escorting in Europe but, more importantly, throughout the island hopping campaign of the Pacific. The ...
