120SR Out Of Control

canada204 · Charging Joined: 18 Jan 2012 Posts: 1

Alright this is what is happening

After Take Off the heli spins left (example push your left stick all the way left) If I try to correct it by using my left stick and pushing it right the heli still spins left maybe slows down a touch I can see the tail rotor is working. I recently purchased a new tail assembly and same problem I have tried to pair my remote numerous times any help greatly appreciated

nick_onelove · Posted: Thu Jan 19, 2012 2:08 am Post subject:

So you're saying you've tried 2 different tail motors and the problem is the same? In the case, my next suspect would be the 5-in-1 board. Also, I've heard that a bad main motor can cause problems with the tail motor.

I would email or call Horizon Hobby, their customer service is great. Tell them you've tried 2 different tail motors and neither provided enough power, they should replace whatever part they suspect is the culprit free of charge.
_________________
Align: Trex 250 3GX + Trex 450 Pro with Vbar
Blade: 450 X, mCP X, 120 SR, mSR X, CX3, mCX2
Esky: Belt-CP X and V2 - Futaba: Heli-Max Axe 400
Walkera: V500D01, M120D01, V100D08, DEVO 8
Spektrum: DX8 - AMA #967873 - IRCHA #4095

Dumb Thumbs · Posted: Thu Jan 19, 2012 9:28 am Post subject:

Two tail units and it still spins left. If you were sure to center the rudder stick trim when you rebound the Tx to the heli then I'd say the control board on the heli is shot, in particular the gyro on it.
Sorry for that bad news. A new board runs about half the cost of a new heli.
_________________
Next Level 650 Quad Copter, T-Rex 500, 450SEv2 & 250
HK 450
Blade CP Pro (deceased), CX3, MCX, MSR,
MCP X, 120SR, MSR X, MQX
Pro Boat-Miss Geico & ShockWave, a few planks & a HPI Baja 5B SS gas buggy.
AMA#900889

friendsofrhomb · Fully Charged Joined: 25 Jan 2012 Posts: 3

Im having the exact same problem. I went rudder full left and then when i released it, it stuck. I tried re binding the Txer, and nothing happened.

The ground was wet so im not sure if water got into the chopper or whether it just broke. There is still input from the rudder, as it does speed up and slow down with radio input, but it doesnt seem like its doing it with alot of power.

Im very new to the world of RC, I've only had it a week, so Im pretty clueless Razz

airshot · Posted: Thu Jan 26, 2012 9:00 am Post subject:

I have read about this happening on some other forums, They found the tail blade was on backwards. Easy enough to try, just flip the tail blade over and push back onto the shaft and see if the heli still spins. I have been told there is a small "X" on thr blade hub that is supposed to face the motor I believe.

Airshot

friendsofrhomb · Fully Charged Joined: 25 Jan 2012 Posts: 3

Problem fixed. Although the tail rotor was responding to TXer input, it wasn't generating much force because the curve of the blade had flattened out, presumably from my repeated crashes whilst learning.

Now all I have to do is wait for the wind to die down so I can go out and break more things

Dumb Thumbs · Posted: Sat Jan 28, 2012 7:43 am Post subject:

Glad to hear it was a cheap & easy fix. When you posted you replaced tail unit I thought it to be the whole tail, blade & all.
_________________
Next Level 650 Quad Copter, T-Rex 500, 450SEv2 & 250
HK 450
Blade CP Pro (deceased), CX3, MCX, MSR,
MCP X, 120SR, MSR X, MQX
Pro Boat-Miss Geico & ShockWave, a few planks & a HPI Baja 5B SS gas buggy.
AMA#900889

friendsofrhomb · Fully Charged Joined: 25 Jan 2012 Posts: 3

well, theres been a week of rain here so I havent been able to fly, I got the chopper back out today and..........the problem was back. Even with the new rotor..... Seems to be it might be the 5 in 1 board, considering its intermittant like that... damn