Friday is here, and the "A Taste of Science for the Weekend" corner is back — number 92.
This time: a few of the wonders hidden inside the massive body of the B-2 bomber.
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Weighing more than 150 tons, with a flight range of over 40 hours and the ability to evade radar systems, the B-2 bomber (in the video) is one of the most formidable and terrifying weapons of war the Iranians have encountered over the past year.
Although precise details about it remain a closely guarded military secret, its iconic flying-wing shape is strongly associated with the ability to destroy hardened, deeply buried targets.
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The aircraft's flat wing shape serves two purposes.
The first is low aerodynamic drag: with no cylindrical fuselage or tail to generate high drag, the aircraft can conserve fuel and remain airborne for an exceptionally long time.
This advantage comes at the cost of inherent instability, since it is the tail that normally keeps an aircraft on course and allows it to bank left or right.
To enable the aircraft to turn without a tail, the trailing edge of one wing opens up and down like a bird's beak, dramatically increasing aerodynamic drag on that wing and slowing it, while the opposite wing continues at full speed — causing the aircraft to turn.
To keep the aircraft stable without a tail, four flight computers operate in parallel and automatically stabilize it hundreds of times per second.
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The second advantage of the wing shape is a low radar signature.
Radar waves that strike the aircraft's body glide around it and are concentrated into a very small area.
Intelligence on the locations of enemy radar systems allows the aircraft to be positioned at an angle that produces the lowest possible radar return.
The aircraft's body is coated in a special dark layer containing iron powder and carbon fibers.
This layer absorbs the radar's radio waves and converts most of them into heat, preventing them from being reflected back to the enemy's radar detectors.
For many years this coating was a serious headache: any exposure to unusual humidity, temperature, or salinity conditions required lengthy and costly repairs to the protective layer. Over the years, a transition was made to a newer, more durable radar-absorbent material.
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Radar detection relies not only on radio waves, but also on the aircraft's heat signature, the noise it generates, and the condensation trail left behind its jet engines.
To address these challenges, the aircraft's hot engines are buried deep within its structure and are not visible from the outside.
The airframe helps absorb engine noise, making the aircraft exceptionally quiet, and an active cooling system mixes engine exhaust gases with cold air before they are expelled, greatly reducing the resulting heat signature.
To prevent the formation of a condensation trail behind the aircraft, a laser system continuously monitors the air in its wake. When it detects the onset of ice trail formation, it immediately alerts the pilot, who adjusts the flight altitude to a drier air layer.
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The aircraft was originally designed by aeronautical engineer Jack Northrop, who was heartbroken in 1949 when the project was cancelled.
In 1980, already in his eighties and confined to a wheelchair, he was unexpectedly taken to view a scale model of the completed aircraft — and broke down in tears.
The decades of operational use have helped accumulate invaluable knowledge and extensive engineering insights, which will be applied to the aircraft's new successor — the B-21.
Shabbat Shalom 😊
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