China's radar evasive stealth fighter made its maiden test flight on Tuesday, making the country only the second nation after US to have this technology. The aircraft called J-20 took off from an airstrip at Chengdu Aircraft Design Institute and flew for about 20 minutes.The test flight came as US Defence Secretary Robert Gates is on an official visit to the country. Gates has been dismissive of the Chinese arms build up and has said that development of stealth technology by China, poses no threat to Washington. According to the US Wall Street Journal, the images of the J-20 in flight suggest that China is making faster than expected progress in developing a potential rival to the US F-22 Raptor which is currently the world's only fully operational stealth fighter. The US is also using the stealth technology in production of the F-35 joint strike fighter. India and Russia have also carried out test flights of their stealth fighter which is based on Sukhoi T-50 jet.