The B-21 Raider, the world’s newest stealth heavy bomber, was eventually made public by Northrup. The B-21 builds upon the success of its illustrious predecessor, the B-2 Spirit, which was also created by Northrup, and is named in honor of Jimmy Doo Little’s B-25 raiders, which memorably struck Imperial Japan shortly after the events of Pearl Harbor during World War II.
The B-21’s technology is thought to be at least two generations superior to the B-2’s, which is astounding given that the B-2 is still one of the world’s most stealthy platforms despite having been in use for more than two decades. Northrop Grumman was given the engineering contract for the B-21 by the USAF in 2015, and the critical design assessment was finished in 2018.
On December 2, 2022, the B-21 Raider was introduced to the public. Compared to the B-2, the B-21 is smaller and can carry less cargo. At first glance, the payload of the B-21 appears to be a disadvantage, but when you consider that the B-21 will be more stealthy given its advanced design and materials, this should allow it to penetrate deeper into contested airspace and hit targets with even greater precision as compared to today’s bombers. The payload of the B-21 is currently estimated to be above 30,000 pounds.
The Air Force is also budgeting for 100 B-21s, which is five times as many as B-2s now in service. By having more B-21s, the Air Force will be able to deploy them internationally and put them within two hours of any target. The B-21 Raider will actually be a part of a larger family of systems for a conventional long-range strike, including intelligence, surveillance, and reconnaissance or ISR electronic attack, communication, and other capabilities. The Raider is also designed to accommodate manned or unmanned operations, making it an extremely effective deterrent.
The B-21 is referred to as dual-capable when it comes to weaponry, which means it can use either conventional or nuclear munitions. The B61 variable yield nuclear fuel could be a potential payload. Gravity Bomb, Directed Energy Weapons or lasers could be used by future weapon systems, such as the B-21, as well as long-range standoff nuclear cruise missiles, long-range anti-ship missiles, conventional free-fall bombs, and laser-guided bombs to hit or disable targets. Additionally, it is said that the Raider has the same engines as the F-35.
If you want to learn more about adaptive engines, you can read about the now-in-use Pratt & Whitney F-135 series engines or the under-development adaptive cycle engines like GE’s XA-100 that are also intended to be used in the F-35. The B-21 and F-35 will benefit from lower costs and higher mission-capable rates because of the employment of similar engines. The B-21 might also be used as a mothership for swarms of tradable drones of varying sizes, either as a fighter screen for the bomber or as a networked hub for strike aircraft. Radar on the B-21 would enable this prospective application.
A stealth bomber was only revealed to the general public twice in history. Some of you may recall the first occasion of this kind, which took place in November 1988 when the B-2 Spirit was revealed to the public. The YB-35 and YB-49 piston engine flying wing concepts from Northrop were far earlier than the B-2, which is without a doubt the company’s most popular flying wing design. These two concepts were developed in the 1940s, long before the idea of stealth aircraft was even conceived.
Reduced Parasitic Drag weight from non-lift-generating components, such as vertical tail surfaces, was the driving force behind the development of flying wings. Theoretically, a flying wing might transport larger cargoes further, faster, and for less cost than current designs. Despite never being put into production, it was discovered during flight tests that these early flying-wing bombers had a modest radar cross-section. This would affect the stealth qualities of the two in a few decades; more on that later. Although it’s difficult to understand now, the B-2’s introduction in 1988 effectively marked the world’s first glimpse of a stealth aircraft.
Even though the F-117 Nighthawk had been in use for a while, the public didn’t really start to notice it until the Gulf War in 1991. However, the B-2’s effect was felt practically immediately.
Actually, the airframe design and materials are the two essential elements that enable America to restore its competitive edge in stealth farming technology. Similar to its predecessor, the B-21 will have flying wings. But we need to quickly review the history of stealth technology, which strangely started in Russia, in order to comprehend why a flying wing is so effective for stealth. Petr Ufimtsev, a Soviet mathematician, wrote a paper titled “Method of edge waves in the physical theory of diffraction” in 1971.
The paper was mostly overlooked in Soviet Russia, but Wright-Patterson Air Force Base’s international technology branch translated it the same year it was published. Dennis Overholser, an engineer at Lockheed Skunk Works.
The F-117 Nighthawk, also known as the Hopeless Diamond, was created as a direct result of a mathematical calculation created by Dennis Overholser, a Lockheed Skunk Works engineer, that used the theories from the paper to compute the radar cross-section or RCS of a three-dimensional object. The F-117’s numerous jagged angles and surfaces for radar deflection or diversion were a direct result of the limited computational capability at the time as well as the essential aerodynamic design trade-offs.
It’s interesting to note that Northrop competed in the project to create the Nighthawk, a stealth aircraft, but lost to Lockheed. However, Northrop kept working on the Cell technology and created the B-2 Spirit using the knowledge gained from the fighter competition and the ever-increasing computational capacity of computers. The B-2 is more streamlined and curved than the Nighthawk in part because of this; the idea is the same, it’s just that the B-2 has a lot greater resolution. This is analogous to how early digital photographs appeared pixelated or blocky, but now ultra-high quality images look realistic. Each picture has square pixels. The more recent photos simply create the image by assembling millions of much smaller blocks.
As previously established, the B-2 is still among the most stealthy aircraft in use today. In fact, even though they are smaller and more recent designs than the B-2, the F-22 Raptor and the F-35 Lightning are not as difficult to spot as the B-2. This is especially true for fighter aircraft, which, unlike bombers, are required to be able to execute daring maneuvers if close-range combat, often known as dogfighting, occurs. The twin vertical tails used by the F-22 and F-35 enable extreme maneuvering but reduce their RCS (Radar Cross-Section). Despite efforts by the designers of the Lightning and Raptor to lessen this design penalty, the vertical tails nonetheless reduce RCS on both aircraft.
Because of this, the majority of sixth-generation ideas include a tailless or flying wing configuration. With exceptionally advanced flight control systems, it is believed that a vertical tail is not necessary, even for a highly agile fighter. To return to the bombers, the B-21 builds on the knowledge gained from the B-2 in this regard. Just consider the developments in computing technology since 1988; the Raider is probably the most stealthy aircraft on the market today, despite having an appearance that is identical to the Flying Wing design.
A benefit of the B-21 will include next-generation radar-absorbing materials or Ram code structures in addition to the Raider’s shape. According to reports, modern Ram Coatings are rated to absorb between 70 and 80 percent of incoming radar radiation.
These coatings, however, are very pricey, difficult to apply, and vulnerable to harm from the elements or even routine flight operations. Ram Coatings have largely been the subject of ongoing research to increase their cost-effectiveness and durability due to these limitations. The alternate high-frequency material, or AHFM, which has been used on the B-2 bomber fleet since around 2004, is one example of a more recent Ram coating.
This more recent material provided the same performance while costing less to maintain. The redesigned B-21 design has adopted recent advancements made to the coatings and coding systems. According to estimates, today’s more modern coatings might absorb up to 90% of focused energy while costing less, taking much less time to install, and being easier to maintain. The improved airframe design and these more recent coatings make it obvious that the B-21 will have a very small radar signature.
Amazingly, the B-21 debuted at the same Palmdale site where the B-2 did back in 1988. It may only come along once in a lifetime to have the chance to see aviation history being made. At a time when geopolitical unpredictability is reigniting the world, the introduction of the Raider will help America preserve its competitive edge because of the B-21’s enhanced health characteristics and large fleet size. A global fleet of stealth bombers capable of launching an undetected attack on any target within two hours is essentially an incredibly potent deterrent. Like the B-2 before it, it appears that the B-21 will once more usher in a new era of strategic deterrence.
The Next Generation Air Dominance or End Guide Fighter and the Navy’s fax fighter will likely follow the B-21 into service in the middle of the 2020s. It’s interesting to note that the B-21 Raiders did not plan to replace the B-52, only the B-2 and B-1.