The Chengdu J-20 is what type of aircraft that is designed to avoid detection, and whose technology likely began in Germany during World War II?
Stealth aircraft:  Development of stealth technology likely began in Germany during World War II, the prototyped Horten Ho 229 was designed for twin BMW 003 jet engines but finally powered by twin Junkers Jumo 004 jet engines being described as the first stealth aircraft.
i don't know