I did. considering US did not have many "black"projects after 19

来源: 于 2011-11-07 11:05:43 [旧帖] [给我悄悄话] 本文已被阅读：次

when F22 was there. The speed is too slow. Without good engine, it is waste of time to talk about speeding up on air craft such as F-20.