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next business day. [ Home > Electric Powered Remote Control Airplanes > Bomber
Airplanes > About Bomber Airplanes ] The article How Radar Works talks about the
basic principles of a radar system.
The idea is for the radar antenna to send out a burst of radio energy, which is
then reflected back by any object it happens to encounter.
The radar antenna measures the time it takes for the reflection to arrive, and
with that information can tell how far away the object is.
The metal body of an airplane is very good at reflecting radar signals, and this
makes it easy to find and track airplanes with radar equipment.
The goal of Bomber technology is to make an airplane invisible to radar.
There are two different ways to create invisibility: The airplane can be shaped
so that any radar signals it reflects are reflected away from the radar
equipment.
The airplane can be covered in materials that absorb radar signals.
Most conventional aircraft have a rounded shape.
This shape makes them aerodynamic, but it also creates a very efficient radar
reflector.
The round shape means that no matter where the radar signal hits the plane, some
of the signal gets reflected back: A Bomber aircraft, on the other hand, is made
up of completely flat surfaces and very sharp edges.
When a radar signal hits a Bomber plane, the signal reflects away at an angle,
like this: In addition, surfaces on a Bomber aircraft can be treated so they
absorb radar energy as well.
The overall result is that a Bomber aircraft like an F-117A can have the radar
signature of a small bird rather than an airplane.
The only exception is when the plane banks -- there will often be a moment when
one of the panels of the plane will perfectly reflect a burst of radar energy
back to the antenna.
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