China's stealth chopper could be adaptation of Z-20; experts slam 'US copycat' claims Liu Xuanzun Published: May 31, 2021 07:18 PM A model of what seems to be a stealth helicopter is on display at a facility of AVIC China Helicopter Research and Development Institute in Jingdezhen, East China's Jiangxi Province. Photo: Screenshot from Jiangxi Television China appears to be developing a stealth helicopter that analysts said on Monday is difficult to detect on radar, infrared sensors and human sight and hearing, judging from a model of the chopper recently revealed in a television report, with some speculating that it could be a stealthy variant of the Z-20 medium-lift utility chopper.