B-21 Bomber's Rear Deck Unveiled by USAF: A Stealth Marvel

A recent online discovery of a photograph showcasing the B-21 bomber has ignited intrigue, providing the first-ever glimpse of the secret aircraft's rear design. This revelation unveils distinct deviations in the exhaust system and the rear configuration compared to its predecessor, the B-2.

The photo, originally shared on Reddit by a user with the handle "u/Mug_Of_Fire," seemingly captures a B-21 in the midst of an exterior engine test. This captivating image swiftly piqued media interest, prompting inquiries that led to the Air Force's acknowledgment of ongoing taxi tests for this classified stealth bomber.

Evidently, the aircraft in the photograph departs from the B-2's design, boasting unique landing gear and an absence of the characteristic "sawtooth" rear configuration associated with the B-2. 

Notably, the rear-view image offers a prominent revelation - the B-21's exhaust system features a rounded and hooded/scallop-shaped design. These exhausts, similar to but flatter than the B-2's air intakes, present a stark contrast to the B-2's boxy slot exhausts.

While the image's angle presents some challenges in definitive analysis, it hints at an extended flat deck behind the exhausts, culminating in a subtly upturned tail point. Shadows at the rear of the central "fuselage" on this flying wing bomber lend support to this observation. Interestingly, the exhausts do not extend to the trailing edge of the aircraft, challenging previous artistic speculations.

An intriguing consideration arises from the absence of the "beavertail" feature, notably absent in videos of B-2 control surfaces during preflight checks. Drawing from the operational wisdom gained from the B-2, it's conceivable that the B-21 omitted the beavertail to enhance structural integrity and streamline stealth, eliminating the challenges associated with seams on an otherwise smooth, stealth-focused design. 

Detailed examination reveals that each wing of the B-21 boasts two flaperons, while a single flaperon appears on each side of the tail. The image also reaffirms the "kite" planform of the B-21, distinguishing it from the B-2's "sawtooth" trailing edge.

It's worth noting that the original design of the B-2 shared similarities with the B-21's planform. However, late in the B-2's development, the need for low-level flight capabilities necessitated the addition of the "sawtooth" tail, leading to significant delays and costs. In contrast, the B-21 appears tailored for high-altitude missions.

Subtle details in the image suggest a slight anhedral, indicating a downward wing angle, although the photograph's quality renders it challenging to conclusively determine if this is solely due to the wing's higher camber compared to the B-2. It's imperative for both the B-2 and B-21 to maintain rigid wings to preserve their stealth attributes, ensuring no wing droop, even when their wing fuel tanks are full.

Curiously, the image does not depict open weapons bays. Additionally, a distinctive feature visible in the photograph is a differently colored patch on the upper port wing root of the aircraft. This patch is not a shadow, as it basks in direct sunlight, confounding aviation experts who are unable to speculate on its purpose.

With the B-21 edging closer to its inaugural flight, anticipated before the year's end, high-speed taxi tests are on the horizon at Plant 42's runway. As the program advances, it is expected that more detailed photographs and information will emerge, unravelling further mysteries of this clandestine aircraft.