glad I saw this thread.my best friend has both the 2.4 7C and the 6 channel 2.4 radio.yesterday a problem developed with his hitec servos on his 3D extra.the hs 65 mg's apparently don't have much torque.we thought maybe the servos on the tail surtfaces were worn out.but after a trip to his local hobby and installing 2 new hs65mg's.the problem has not gone away.The esc is an airboss45 and is the standaed match for the 3D planes ..not knowing much about electronics we are also wondering if we are getting a lower signal or voltage.. got any ideas???