ok bad glitching at field today on maiden flight this is a used plane that i only added the reciver and batt to the servos were already installed.
equipment futaba reciver fp-r127df
servos hitech hs-311
4.8v 2000mah nimh batt

ok have moved antena as suggested no change
servos were making little buzz noise so i started un hooking them 1 at a time to see if they all did it
only the throttle and elevator servo do it the rudder alerions and retract do not
could this be the problem in those servos is that normal for them to buzz. they were not moving just buzzing.
also here at home it glitches very little. will take outside tomarrow and start engine to see if it becomes worse.
any ideas would be greatly appreciated


thanks
bill

I think when servos start buzzing, either they are in a bind or possibly going bad. Correct me if that is wrong. Try replacing one and see what happens

When I flew the Thunderbolt, the glitch would not cause the plane to pitch up or down, but to yaw. It didn't cause it to bank, which would indicate an aileron servo. So to me, the glitches appeared to be rudder-related, pointing to the rudder servo.

A receiver crystal problem would affect all control functions. A buzzing servo is not necessarily bad, but it could be caused by binding.

I would swap the rudder and throttle servos.

The glitches were very brief, but it happened at least four times during that flight. Had they been a bit more more violent, I would have landed after the first or second one!

Other than that, the plane flew very nicely. :thumbup:

Check the linkages on the rudder and see if they are binding as well. I had a futaba reciver that was worked well but there was a horrible glitch on the rudder the plane flew well but it would add full rudder input randomly.

I found that some of the cheaper servos will buzz with the slightest drag.
I use those on the throttle if I need one bad enough.
Swapping with a known good servo is a good idea to trouble shoot the problem too!
A buzzing is a vibration, so if it would buzz at the right freq. it could possibly cause a glitch too? :unsure:

i think i solved the glitch :banana:
i changed recivers and nothing for 20 min in house went outside ran a tank through it and saw nothing
i ran it at diffrent throttles and was moving control surfaces similar to flight and saw nothing abnormal hope that was all it was
except now i need a new reciver for the plane i stole that one from :P

It might be cheaper to send it off to get it looked over and repaired.

Check the Xtal connector. I had one that was loose one time causing that.
Forgot all about it! :unsure:

The crystal controls pretty much all functions of the receiver...
The glitch would normally affect all control functions. Of course it has other components, and I know nothing about them.

As 4star40 said, it IS best to send it to Radio South in Pensacola... :yes:

I agree with Mr. Dutchman, It would best to send it off and have it looked at. I am in the process of that now. As far as the servos they all have a bit of chatter, all it is, is the servos fighting to find center or hold control surfaces in a certain position.... Or I think at least....

I agree if you narrow it down to that too. I do know that the servo uses a variable positioning resistance to hold position. I'm assuming you checked the battery voltage so if they're all doing it then I would think it is the reciever too! :thumbup:
Keep in mind that all the connections are connected together on the board in the reciever for the ground and positive voltage and the signal line is all that is seperated just in case you didn't know. ;)