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The exact radar cross-section (RCS) values for specific aircraft like the B-2, B-21, F-22, and F-35 are classified, and publicly available information often provides only rough estimates. However, based on available details and general analysis of the design and stealth technologies used in each aircraft, here’s a general ranking of their RCS from smallest to largest:
Estimated RCS Ranking (Smallest to Largest):
1. B-21 Raider (Most likely the smallest RCS)
• The B-21, as the successor to the B-2 Spirit, is expected to feature advanced stealth technologies, further enhancing its RCS reduction capabilities. With its optimized design and the use of the latest radar-absorbing materials and shaping, the B-21 is likely to have the smallest RCS among these aircraft.
• Expected to have an RCS in the range of 0.001 to 0.1 m², similar to or possibly smaller than the B-2 due to advancements in radar-evading technology.
2. B-2 Spirit
• The B-2 Spirit has an extremely low RCS due to its flying wing design and extensive use of radar-absorbing materials. Its design was optimized to reduce RCS across multiple radar frequencies.
• The B-2’s RCS is often estimated to be in the range of 0.1 m² or less.
3. F-22 Raptor
• The F-22, while having a highly advanced stealth design, incorporates more conventional aerodynamics than the B-2 or B-21. Its RCS is still very low, but somewhat larger than the B-2’s due to its more traditional fighter jet configuration.
• The F-22’s RCS is typically estimated to be in the range of 0.3 to 0.5 m².
4. F-35 Lightning II
• The F-35 was designed with stealth in mind, but it is a multirole fighter with a broader focus on versatility, including different variants for different roles. While still stealthy, its RCS is generally considered to be larger than the F-22’s and B-2’s due to its more traditional design and its multirole functionality.
• The F-35’s RCS is often estimated to be in the range of 0.1 to 1 m², with the figure varying based on the variant and specific mission configuration (e.g., F-35A, F-35B, or F-35C).
Summary of Estimated RCS (Smallest to Largest):
1. B-21 Raider (Likely the smallest RCS)
2. B-2 Spirit
3. F-22 Raptor
4. F-35 Lightning II
Key Considerations:
• The RCS of an aircraft can vary depending on the radar frequency used to detect it. Stealth aircraft are designed to minimize their RCS in specific frequency bands where they are most vulnerable.
• While these estimates are based on design analysis and known capabilities, the precise RCS values are likely classified and may differ under different operational conditions.
• The B-21, being the most advanced in terms of stealth technology, is expected to have the smallest RCS compared to older designs like the B-2, F-22, and F-35.
This ranking reflects the general understanding of the designs and stealth technologies of these aircraft, though actual values remain classified.
