Tämä on minulle uutta, että jo toisen maailman sodan aikana USAF käytti häivelaitteita lentokoneissa hämätäkseen sukellusveneitä ja näin pääsivät yllätämään ne ennen sukellusta.
Silloin se oli vielä niin yksinkertaista, että koneiden pohjiin asennettiin kirkkaita valoja, joloin ne erottuivat huonommin kirkkaita pilviä ja taivasta vasten, kuin jos pohja olisi vain yksinkertaisesti maalattu.
Nykyään voidaan alusten pohja vuorata elektronisesti ohjatuilla "näyttökalvoilla" joiden pintaan saadaan haluttu väri.
NASA:n sivuilta poimittua:
"Q: Stealthy aircraft are supposed to be difficult to detect. If that's true, would you be surprised to learn that lights are sometimes attached to stealth aircraft? And they're turned on when the airplane is trying to be stealthy! Why would aircraft designers do that?
A: During the day, we see aircraft overhead because they are darker than the sky. Brightening them with lights makes them less visible. Visual stealth dates back to the 1940s and the US Navy's Project Yehudi. One of the technologies investigated under Yehudi was the fitting of lights to the undersides of antisubmarine and attack aircraft. This matched their luminance with overcast skies, making them more difficult for U-Boat lookouts to see. Modern versions of visual stealth involve the use of electro-optical photo sensors that dial in the brightness of high-tech illumination devices automatically.
Project Yehudi was named after violinist Yehudi Menuhin and his appearance on Bob Hope's old radio show. The show's zany character actor Jerry Collona didn't know who Yehudi was and was teased to the point where the "search for Yehudi" became a running gag.
Silloin se oli vielä niin yksinkertaista, että koneiden pohjiin asennettiin kirkkaita valoja, joloin ne erottuivat huonommin kirkkaita pilviä ja taivasta vasten, kuin jos pohja olisi vain yksinkertaisesti maalattu.
Nykyään voidaan alusten pohja vuorata elektronisesti ohjatuilla "näyttökalvoilla" joiden pintaan saadaan haluttu väri.
NASA:n sivuilta poimittua:
"Q: Stealthy aircraft are supposed to be difficult to detect. If that's true, would you be surprised to learn that lights are sometimes attached to stealth aircraft? And they're turned on when the airplane is trying to be stealthy! Why would aircraft designers do that?
A: During the day, we see aircraft overhead because they are darker than the sky. Brightening them with lights makes them less visible. Visual stealth dates back to the 1940s and the US Navy's Project Yehudi. One of the technologies investigated under Yehudi was the fitting of lights to the undersides of antisubmarine and attack aircraft. This matched their luminance with overcast skies, making them more difficult for U-Boat lookouts to see. Modern versions of visual stealth involve the use of electro-optical photo sensors that dial in the brightness of high-tech illumination devices automatically.
Project Yehudi was named after violinist Yehudi Menuhin and his appearance on Bob Hope's old radio show. The show's zany character actor Jerry Collona didn't know who Yehudi was and was teased to the point where the "search for Yehudi" became a running gag.
Vastaukset 1
Vanhimmat
Mikäs on häivelaite, löytyiskö kuvia. Sinä tiedät varmaan häivelaite nimen englanninkielisenä, kertoisitko senkin samalla kun laitat kuvia.