The easiest way for a secret airplane to “show up” is to arrive as background scenery in a propulsion video. It is the mystery of the Pratt & Whitney XA103 concept to the Air force Next Generation Adaptive Propulsion program, following a brief computer generated video released over the Internet depicting a two-engine, tailless fighter with an incredible shape that could be perfectly compatible with the Boeing F-47 project. The plane used in the clip was not identified as the F-47, but the image was attracting as it combines a next-generation airplane shape with the engine program that is occurring to make it possible.
The imaginary jet in the clip is a one-seat, tailless design with a trapezoidal planform and canard foreplanes, and two inlets located below the foreplanes. The back-end indicates twin engines and nozzle design resembling two-dimensional thrust-vectoring, an arrangement that suggests that designers are still searching for high-end manoeuvre and energy control even when well into signature-control space. The little things, such as the door to a dorsal refueling receptacle, markings that are indicative of boom refueling, and even an eye-catching serial number ending in “048” some of which viewers interpret as a wink, keep analysts gawking. There is also a hint here of cockpit positioning that is more forward than many contemporary fighters and this choice may be used to accommodate cockpit visibility and packaging limits within low-observable shapes.
It is more less aesthetic and determinative in the propulsion aspect, where the engineering logic is concerned. The XA103 is outlined as a three-stream adaptive cycle arrangement that is meant to move air between a third bypass stream and the core/fan streams so that the engine changes between efficiency-biased and thrust-biased operating conditions. The figures of 25 per cent fuel saving and 20 per cent greater thrust than standard fixed-cycle engines, and the ability yet to feed power-intensive avionics and control heat, an ever-growing central concern with the proliferation of sensors, electronic warfare, and on-board processing, are the widely quoted targets associated with this idea. The performance band that is being targeted to be pursued by NGAP candidates is one of stated thrust class between 35,000 and 40,000 lbf.
It is equally important how the engine is being constructed and not just what it promises. Pratt and Whitney have stated that the XA103 was its first engine designed in an entirely digital environment both in concept and manufacturing with model-based definition intended to ensure that configuration, inspection, and test data remain directly connected with the 3D design baseline. During one of these public-facing demonstrations, engineers ran a digital architecture model with hundreds of virtual sensors observing it, deliberately broke a sensor, and in a couple of minutes discovered what it did through integrated tools, a glimpse of the “design it, test it, learn fast” workflow that modern programmers attempt to make institutional.
This all feeds into what an aircraft of the sixth generation is more driven to become: an airplane that is designed to be influenced by stealth and range, but also power generation, cooling margin, and networking needs, which previously could be considered by the prior generation of fighters as an incidental limitation. The F-47 is a part of a broader “construct of systems” of NGAD, in which the crewed platform is intended to work with uncrewed Collaborative Combat Aircraft. That configuration makes propulsion and thermal control even more vital, as the role of the crewed jet becomes that of a high-end sensor/shooter and battle manager node, as opposed to a self-contained solution.
Published F-47 requirements are general, nevertheless giving limits: Air Force commanders have pegged the concept to more than 1,000 nautical miles of combat radius and faster than Mach 2 speeds, a combination which strains both the airframe form and the engine flexibility. In that respect, a brief CGI caricature of an airplane is irrelevant as something that might upset the plot, but rather as one of the only clear hints as to what the line is actually going to result in.
