F-47 Stealth Explained: What “Stealth++” and All-Aspect Low Observability Mean

The US Air Force rates the F-47 as “stealth++”, one step above the F-22 and two above the F-35 on its own informal scale. Officials describe the aircraft’s low observability as all-aspect and broadband, with a reduced infrared signature. In plain terms, it is meant to be hard to detect from every direction and by more kinds of sensor than today’s stealth fighters.

No measurements have been published and the released images were deliberately altered, so this article explains the claims, the physics behind them and the limits of what can be inferred.

What the Air Force has said

The rating appeared in the graphic released in May 2025 by Gen. David Allvin, then chief of staff, which labelled the F-35 “stealth”, the F-22 “stealth+” and the F-47 “stealth++”. The labels are shorthand, not measurements.

On the day of the contract award the Air Force said the aircraft would have more advanced stealth than fifth-generation fighters. Reporting since has added that the design is intended to be low-observable from all aspects and across a broad band of frequencies, and to have a reduced infrared signature. For the other published figures, see what the F-47 is.

What all-aspect and broadband mean

Stealth is not invisibility. It is a reduction in how far away a sensor can detect and track an aircraft. Today’s stealth fighters are optimised mainly against the high-frequency radars used by enemy fighters and missile batteries to guide weapons, and they are stealthiest when seen from the front.

All-aspect means the reduction holds from the sides and rear as well, which matters for an aircraft that must fly deep into defended airspace and out again. Broadband means it holds against lower-frequency radars too. Those long-wavelength sets, used for early warning, are less affected by the shaping of a fighter-sized aircraft, especially its tail fins.

Why the missing tails matter

The renderings show an aircraft with no vertical tail surfaces. That is the single most important clue. Vertical fins are efficient reflectors of long-wavelength radar energy and are visible from the side whatever their angle. Removing them is the main reason flying-wing bombers such as the B-2 and B-21 are considered harder to detect across frequencies than fighters.

The price is control. Tails provide stability and steering, particularly at high angles of attack. A tailless fighter has to do the same job with split control surfaces, engine thrust and fast flight-control computers. China’s two new prototypes, the J-36 and J-50, have made the same choice.

The canard question

The same renderings appear to show small foreplanes, or canards, ahead of the wing. That surprised many observers, because moving surfaces at the front of an aircraft are usually considered bad for stealth: they add edges and gaps that can reflect radar.

There are three possible explanations. The canards may be real, and Boeing has found a way to manage their signature. They may be a feature of the demonstrator, not the final aircraft. Or they may be misdirection, since officials have said the images were changed to conceal the design. It is not possible to tell from outside the programme.

Heat and emissions

Radar is only one way to find an aircraft. Infrared search-and-track sensors, now fitted to Chinese and Russian fighters, look for heat from engines and from air friction on the skin. The F-47’s adaptive engines help here: their third airstream supplies cool air that can be used to lower exhaust and airframe temperatures.

The third signature is electronic. A fighter that uses its radar or datalinks can be located by the signals it sends. Officials have spoken of the F-47 in terms of spectral dominance, which implies heavy use of passive sensors, hard-to-intercept links and electronic attack. Carrying weapons internally and sending drone wingmen ahead to do the transmitting are part of the same approach. We covered the other side of this contest in claims that stealth can be tracked.

Stealth that is easier to maintain

Low-observable coatings have been a heavy burden on the F-22 and, to a lesser degree, the F-35. They wear, need climate-controlled repair and keep aircraft on the ground. The Air Force has promised the F-47 will be more sustainable and supportable, and Boeing is building a radar-signature measurement facility beside the assembly line in St. Louis.

Whether those promises hold will not be known until aircraft are in squadron service. It is one of the main differences claimed over the Raptor, as we note in F-47 vs F-22.

What cannot be known yet

No radar cross-section figure exists in public for any of these aircraft, and none will. The true planform, the inlets, the nozzles and the materials are all classified. What can be said is that the stated goal goes beyond the F-22, and that the configuration shown is consistent with that goal.

Frequently asked questions

Is the F-47 a stealth fighter?

Yes. The Air Force rates its stealth above that of the F-22 and F-35 and describes it as low-observable from all aspects and across a broad range of radar frequencies.

What does “stealth++” mean?

It is the label the Air Force used in a 2025 graphic to show that the F-47 is intended to be stealthier than the F-22, labelled “stealth+”, and the F-35, labelled “stealth”. It is not a technical measurement.

Is the F-47 stealthier than the F-22?

That is the stated intention. No measurements have been published, so the claim cannot be independently checked.

Does the F-47 have a tail?

The official renderings show no vertical tails. The Air Force has said the renderings were altered, so the final configuration is not confirmed.

Do canards make the F-47 less stealthy?

Canards usually make stealth harder to achieve. The renderings appear to show them, but it is not known whether the real aircraft has them.

Can radar detect the F-47?

Any aircraft can be detected at some range. Stealth reduces that range, ideally to the point where the aircraft cannot be tracked and engaged in time.