You haven't got an aircraft problem you have a 90% chance of having a servo problem.
I have been working on solving the jumping problem for 12 months and am writing a servo repair manual so if your servos are out of warranty you can fix the servo circuit problem.
HITEC have a new repair out and will replace the circuit board free of charge in the USA. The repair is being sent to
MODELENGINES very soon " they sent me servos to destroy and help solve the problems that plagues all 7XXX G2 servo"
Most of the problems showed up after a few flights and the servo Jitter and jump under light loads " see videos on
YOUTUBE "HITECJITTER" and similar names. We only just found out that some servos are Jumping under load and usually
shows up when the servo draws 1amp. Do not use wire larger than 20 AWG " BOOMARC " is getting 20AWG servo wire in
the next couple of weeks. We found that large Dia. wire especially wire with thick insulation makes the problem worse
due to capacitance building up in the wires and discharging into the servo.
We have 3 repairs that can be carried out by the owner 3 because it depends on what system you are using.
An example would be if you are using a SMARTFLY or POWERBOX system you only need to use repairs 1 and if required
repair 1.6 if using just a receiver directly to the servos you would need to do repair 1,1.6 and 2.
send me a PM and I will try to assist you.
looking for help. have a krill katana am haveing problems with elevator flutter. first time i had
hitec 7955 servo's. the model was flown with no initial problems, after about fifteen flights i
experienced the flutter problem at full power. i have just replaced the 7955 servo's with 7950
servo's .flew the model today still got the same problem flutter at anything over half throttle.
the model was set up as per krill's instructions. i primarily fly jets the katana was to be my fly
for fun model. can't say i am haveing much fun yet.any ideas or help would be great
kmrc jets australia