<span style="font-size: small">Hi Sunday,
JL viper jet just like a strong heart medicine.It will make the pilots crazy,At least I would think so
Btw,JL viper jet's knife edge flight is very easy to do,look at my flight video below.You can try that too.
video:
http://v.youku.com/v_show/id_XMzgyNDM3ODA0.html
Regards
William</span>