Stealth is the technique of making a plane (or any other object) less visible to the enemy by reducing its radar and IR (infra red, heat) visibility. Reducing the IR image of a plane can be accomplished by directing the hot exhaust gasses to the top of the plane and mix them with cold air (the B-2 uses this technique). Reducing radar visibility can be accompli^ed by deflecting the radar waves in such a direction that they don't go back to the emitting radar (F-117 uses faceting, the B-2 uses continues curving) or making use of less radar reflecting materials (composite material, plastic) and/or radar absorbing coatings. A study of radar absorbing materials is also made. The seminar also deals with plasma stealth technology
Stealth is the technique of making a plane (or any other object) less visible to the enemy by reducing its radar and IR (infra red, heat) visibility. Reducing the IR image of a plane can be accomplished by directing the hot exhaust gasses to the top of the plane and mix them with cold air (the B-2 uses this technique). Reducing radar visibility can be accompliced by deflecting the radar waves in such a direction that they don't go back to the emitting radar (F-117 uses faceting, the B-2 uses continues curving) or making use of less radar reflecting materials (composite material, plastic) and/or radar absorbing coatings (e.g. B-2). The active substance in these coatings are mostly metal ions. Because of this most of the radar absorbing coatings aren't very water-resistant.
Stealth technology, designs and materials engineered for the military purpose of avoiding detection by radar or any other electronic system. Stealth, or anti detection, technology is applied to vehicles (e.g., tanks), missiles, ships, and aircraft with the goal of making the object more difficult to detect at closer and closer ranges. Since radar is the most difficult form of detection to elude, avoidance is generally accomplished by reducing the radar cross section (RCS) of the object to within the level of background noise; for example, the reported goal of U.S. military designers is to make a fighter plane with an RCS the size of a bird. The RCS is the area of an imaginary perfect reflector that would reflect the same amount of energy back to the receiving radar antenna, as does the actual target, which may be much larger or even smaller than the RCS. A pickup truck, for example, with its flat surfaces and sharp edges has an RCS of approximately 200 sq m, but a smooth-edged fighter jet has an RCS of only 2 to 4 sq m. The RCS of any given object, however, differs at various angles and radar frequencies. Much about stealth technology remains classified, but among the anti detection techniques used in the U.S. Air Force F-117 Stealth fighter plane (which probably has an RCS of 1 sq m or less) are a low profile with no flat surfaces to reflect radar directly back, the intensive substitution of radar opaque composites in place of metals, and an overall coating of radar absorbing
material. The implementation of stealth technology usually requires such compromises as reduced payload capacity, aerodynamic instability, and high design, production, and maintenance expenses.
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