The stealth bomber is designed to be able to reach and bomb a target without being found by the enemy's radar.

The F-117A Nighthawk uses two General Electric F404-F1D2 turbofans. The aircraft was retired in April 22, 2008.

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They are almost undetectable and often missed .

China states that they have a defensive policy. With a population of 1.3 billion, China has a very large population in comparison to other countries to defend.

If we see why the US has stealth aircraft, the reasons are very simple:

In modern warfare, it is about being invisible to the enemies RADAR which allows you dominance on the battlefield and the air. Having stealth aircraft in your military is a major advantage over many other countries. China does not publicly disclose why they have a stealth aircraft however if we look at it in terms, they say they will use it for defensive purposes only.

But moreover like any other country who has developed stealth aircraft or weapons, they'll say, it will only be used to defend its citizens.

The geometry of the surfaces (to change the reflection), the materials of the surfaces (to absorb radar), the exhaust is cooled to reduce heat signature, anything that reduces the heat and radar signature of the platform

Stealth aircraft are not actually invisible to radar, but the waves reflected by it are far fewer than what is needed for identification as a plane.

1) The first way that it prevents this is by its shape, which reflects radar waves in random directions, rather than back to the receiver.

2) Secondly, the special paint used has the ability to absorb electromagnetic energy in the same frequency as radar impulses.

3) Finally, the mission profiles often allow stealth aircraft to fly close to the ground, where their radar return can be lost in ground clutter.

Almost 35,00 feet or more with the F-22 Raptor from lockheed martin.

Lockheed Martin

The F-22 uses a few systems, and lessons learned from the F-111 to be a Low observable aircraft.

The engines emit a heat signature that is unmistakable, but they have used heat hiding components in the belly, and a squared thrust vectoring exhaust to disperse the heat.

They use multiple angles on the fuselage to diffuse radar, interior mounted missiles or bombs, changed the intake to hide the compressor from radar, and a radar that can be aimed to reduce exposure.

One of the many ways to locate and identify an aircraft is by homing in on it's radar emission.

Radar absorbent coatings are employed to help reduce it's signature as well.

The B-2's maximum speed is 628 mph while the speed of sound is 768 mph, so ii is subsonic (the B-2 cannot fly faster than sound).

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The unit was officially located at Area 51of the Nevada Test Site, assembled at Lockheeds famous Skunkworks facility in California.