The radar technology was developed at the beginning of the 20th century, however fell into oblivion. The United States, for example, long experimented with huge air ships to monitor the airspace. Until the second world war caused then the breakthrough of the radar. In Hawaii, but the technology was not around the clock – what allowed the attack of Pearl Harbor. However, many military felt the desire to go undetected by enemy radar systems. This led to the development of so-called stealth bomber. Long time was doing only the army in possession of such aircraft. Now, however, several States have developed its own stealth aircraft. This goal now also Japan.
The development on their own is it necessary, because although a variety of ordinary combat aircraft on the market is international, so far but no country wants to export its stealth technology. Japan has made himself so the company Mitsubishi Heavy technologies to work and now presents a first concept aircraft. This is not explicitly have a retro product. Rather the X should serve 2 called machine first, to experiment with the new technology. The company remained correspondingly restrained so far with details. Only the dimensions of the Japanese plane were known: he is 14.2 meters long and 4.5 meters high.