What if its next-generation carrier-based fighter could essentially eliminate its radar signature without a solitary vertical tail to give it away? That is the alluring question posed by Northrop Grumman’s recently unveiled conceptual drawing of its F/A-XX, an upcoming sixth-generation stealth fighter for the U.S. Navy.
The photo, however carefully cropped and shadowed, shows a nose fuselage blending smoothly into a blended wing-body, without even a hint of vertical fins. Such a completely horizontal design, long the subject of stealth theory, would be an advance in radar cross-section (RCS) minimization. By removing upright surfaces that can reflect back to their origin radar energy, the aircraft might significantly lower the “return” signal that hostile air-defense systems depend upon. The design is reminiscent of the shaping rationale of the B-2 Spirit and the upcoming B-21 Raider, which unites wing and fuselage into a single, continuous, low-observable shape.
Stealth shaping is applied to the F/A-XX engine inlets as well. The illustration depicts smooth, top-mounted intakes located above the wing roots configuration that conceals the compressor faces from radars on the ground and reduces direct line-of-sight exposure. This is a break with the more typical ventral intakes of traditional fighters, which can generate high radar returns. The philosophy of design echoes the B-21’s sleekly faired inlet geometry, where each curve is designed to scatter electromagnetic energy away from the source.
Aside from radar signature, thermal management is the other frontier. Though the F/A-XX’s rear section is concealed in the picture, Northrop’s experience with the B-2 and B-21 implies employing internally buried engines and exhaust treatments for dispersal of hot efflux into ambient air. The B-21, for instance, uses exhaust shaping and cooling methods so effective that its infrared signature can be camouflaged against the ambient atmosphere. In a high-performance naval fighter, these measures might make detection by contemporary infrared search-and-track (IRST) systems more difficult, as such systems are more widely used on peer adversary ships and aircraft.
The tailless configuration also poses aerodynamic and control issues. With no vertical stabilizers, yaw stability and control would have to be obtained through other means split drag rudders, differential spoilers, or sophisticated elevon arrangements. The Northrop B-2 employs split rudders on the wingtips to create asymmetric drag for yaw control, a fix that might be adopted and improved for the F/A-XX. Advanced fly-by-wire flight control systems, combined with real-time aerodynamic simulation, would be necessary to ensure stability over the entire flight envelope.
From an engineering standpoint, not having tails will minimize parasitic drag and structural weight, likely enhancing range and endurance imperative for carrier air wings that have to project power far from the ship. The Navy has listed “operational reach” and “long-range kill chains” as top enablers for the Air Wing of the Future, and a tailless, stealth-optimized fighter fits that vision. If performance requirements are equivalent to what has been considered for the Air Force’s F-47 higher than Mach 2 top speed and a combat range greater than 1,000 nautical miles the F/A-XX potentially would allow the carrier strike group to project its power deep into contested air space.
Radar cross-section measurement methods highlight the potential significance. Current RCS testing employs anechoic chambers and outdoor ranges to map how an aircraft scatters radar at various frequencies and angles. Even minor discontinuities panel boundaries, fasteners, or misaligned interfaces can peak the signature. By eliminating entire sets of reflective geometry, like vertical tails, designers can realize orders-of-magnitude RCS reductions. The RCS of the B-2, for instance, has been compared to a bumblebee; the B-21 is reported to look no larger than a mosquito on some radar bands.
Thermal signature reduction is also data-driven. Infrared imaging and computational fluid dynamics are employed by engineers to simulate exhaust plume mixing with ambient air at lower temperatures. Plume temperature gradient management and hiding the exhaust from IRST sensor line-of-sight can retard detection, gaining valuable seconds in a beyond-visual-range fight.
Northrop’s move to look back at design hints from its YF-23 Black Widow II from an airplane generally perceived as stealthier and faster than the F-22 prototype it lost indicates a mix of tested low-observable shaping with current materials, sensor fusion, and autonomy. The company’s handling of the B-21’s digital engineering and open-systems approach may enable the F/A-XX to continuously improve quickly, incorporating new sensors, weapons, and AI-powered decision aids throughout its life.
If the prototype is even half as representative of the final design, the F/A-XX might be the most stealthy carrier-based fighter ever constructed. Its blend of tailless aerodynamics, inlet and exhaust signature control, and advanced flight systems would represent a generational step in naval aviation a one in which the air wing of the carrier can function in the most dense threat environments with unprecedented survivability.
