shadeyB
Hi Pilots
Completed a new build however i have adjusted all 4 servos 8 times now 🙁 they keep jumping off centre for some reason ??? 
.Centre all servos and secure on clevis, plug in battery and all 4 servos jump off centre
. while battery is still connected i adjust clevis to ensure surfaces are centred, turn plane over and put on runway, wiggle controls on Radio to check direction then BLAM it happens again.
thinking the adjusting screw between servo and push rod had slipped i readjust with battery disconnected.
Centre everything  🙂 looks great and ready to kill the sky - plug in battery and guess what ..... BLAM servos move off Centre again ?????
all New servos, same brand, this is the only plane i have issues with so figured its not the radio.
I have reset ESC
re-Bind receiver
centred servos
and keeps happening 

im lost ???? 
Fly it like you Stole it
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DualDesertEagle
Do u center the servos by moving the sticks and trims to neutral or some other way? Ur description is a bit unclear about that.

Have u tried different servos?

Have u tried a different receiver?
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Wildthing
What brand of servos you using? 
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e3_Scott
shadeyB wrote:
Hi Pilots
Completed a new build however i have adjusted all 4 servos 8 times now 🙁 they keep jumping off centre for some reason ??? 
.Centre all servos and secure on clevis, plug in battery and all 4 servos jump off centre
. while battery is still connected i adjust clevis to ensure surfaces are centred, turn plane over and put on runway, wiggle controls on Radio to check direction then BLAM it happens again.
thinking the adjusting screw between servo and push rod had slipped i readjust with battery disconnected.
Centre everything  🙂 looks great and ready to kill the sky - plug in battery and guess what ..... BLAM servos move off Centre again ?????
all New servos, same brand, this is the only plane i have issues with so figured its not the radio.
I have reset ESC
re-Bind receiver
centred servos
and keeps happening 

im lost ???? 


Not to insult your intelligence with any of these suggestions, but here are some things that come to mind.

Ensure all your servos are plugged in correctly, ie the plug not reversed where you might have ground where power is supposed to be, etc.  Normally the servo will kick all the way over one way if this happens and won't respond to inputs in my experience, but depending on your receiver, transmitter, etc, could be something simple to check.

Go through your transmitter, ensure you have no trim or subtrim in any of the channels into which your servos are plugged.

Check to make sure you don't have any mixes/additions (flaps, spoilers for example) you don't want and that all the switches in your transmitter are in the correct position so that you are not activating any mixes that you might have programmed that you don't want before takeoff.

Good luck.

Cheers,

Scott
Park Jet noise...the "other" sound of freedom😎
#ParkJetnoise #ParkJetpilot
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Wildthing
Seeing that you say it is the only plane doing this and maybe assuming you have more planes with the same servos try swapping out the rx. 
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shadeyB
Thanks pilots

DDE
I centre servos with a AAA battery pack before i install them in plane and again check before i attach arms 
Wildthing
all new analog metal gear servo - turnigytm-tgy-50090m-analog-servo-mg-1-6kg-0-08sec-9g bought some for new builds and all others work however ive not switched any out, with servo tester they all worked fine 
Im guessing it is probably the receiver as you say 
Scott
🙂 None taken haha
Serovs all in correctly after realising Ailerins were plugged into the Gear channel haha, thats exactly what has been happening - all servos kick over one way ???
all trims are cancelled/centred before i bind TX/RX , no mixes either (will check again) all switches in the correct position (too many switches on radion that i never use haha

thanks for the support guys 
Fly it like you Stole it
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Wildthing
I haven't had any problems with the Turnigy servos.   

Make sure your hinges move nice and freely and even check the linkage stoppers (if you use them) that they rotate freely. I use linkage stoppers all the time and I loctite the nuts on and in doing so I sometimes loctite the stopper to the servo arm and it won't twist 😃 . But yes if you have another rx thro it in and see what happens. 
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e3_Scott
shadeyB wrote:
Thanks pilots

DDE
I centre servos with a AAA battery pack before i install them in plane and again check before i attach arms 
Wildthing
all new analog metal gear servo - turnigytm-tgy-50090m-analog-servo-mg-1-6kg-0-08sec-9g bought some for new builds and all others work however ive not switched any out, with servo tester they all worked fine 
Im guessing it is probably the receiver as you say 
Scott
🙂 None taken haha
Serovs all in correctly after realising Ailerins were plugged into the Gear channel haha, thats exactly what has been happening - all servos kick over one way ???
all trims are cancelled/centred before i bind TX/RX , no mixes either (will check again) all switches in the correct position (too many switches on radion that i never use haha

thanks for the support guys 


No problem, so did swapping the ailerons out of the gear channel and into the correct channel fix the issue?

Good luck on your maiden.

Cheers,

Scott
Park Jet noise...the "other" sound of freedom😎
#ParkJetnoise #ParkJetpilot
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solentlife
Its worth noting that many Turnigy MG servos in fact have final output gear nylon ... and that can lead to servo 'clicking teeth' to offcentre when pressed.
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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