lihao

Ok,I understand.Thanks for your answer.

OK,thanks for your answer and your evaluate of my English.I think I have some problems on the expression.My problem is "Why can't I maintain my speed(such as 20KTS) at IDLE when the weight is heavy",not 'Why can't I start rolling at IDLE.'when I'm rolling,more time I have rolled,more speed I have lost..So I must to increase power to get speed.Maybe I should try rolling in a light weight.Colin

First of all,I'm just a junior school student from China.My English is not well,and maybe there are some spelling mistakes or grammar's.Hope you understand.First,When I used NGX,I found that it couldn't taxi at IDLE.It must used about 22% or 23% to maintain speed.In fact,it only need IDLE to taxi in the real world.Second,when I turned off the runway after a nice landing,I found spoiler couldn't get down by itself.Why the spoiler must get down manually when I increasing power?Don't laugh at me because of my bad English,thanks.