Chinese portal mil.news.sina.com.cn now wondered why Internet users never have seen the layout with b / n 2003 J-20 fighter.
Known models with b / n 2001, 2002, 2004 and 2011. According views portal layout with b / n 2003 (the crotch between 2002 and 2004) is perhaps the prototype aircraft for static tests and contained inside the plant in Chengdu.
Also, the assumption is that the board in 2004 is a modernized prototype in 2002 (in the near future this number is missing), that are equipped with radar with active phased array.
So Makar, aircraft flight models are 2001, 2004 and 2011. Layout 2011 (brand new numbering) is a pre-prototype aircraft J-20, will continue in 2012, etc.
It is also reported that on March 2 was conducted flight layout with b / n 2011 while bolshennom congestion of spectators.