we added the 4 servos for flaps with rudders, and added 3 cylinders with gear doors, only add 350g(0.77lbs), the F-15 EDF weight now is 7050g (15.5lbs) and test flight again,
http://v.youku.com/v_show/id_XNDA2MzQwMTk2.html
http://v.youku.com/v_show/id_XNDA2MzQwNzU2.html