Spinning violently on spool up, 3GX

[extreme1]

I just finished the DIR and tail setup and everything went smoothly ( I think), with the help of one of the members.
The problem is the Trex 450 pro spins violently the the left when I spool it up. I can correct it with rudder stick, but then it spins violently to the right. Any ideas?

[koppterx]

easy fix,,,,,tail correction on your 3gx needs to be reversed. stick movement is not the same as gyro correction.

gyro is correct when trailing edge of tail blades move in the same direction as tail.

[torpedoarmed]

Originally Posted by extreme1

I just finished the DIR and tail setup and everything went smoothly ( I think), with the help of one of the members.
The problem is the Trex 450 pro spins violently the the left when I spool it up. I can correct it with rudder stick, but then it spins violently to the right. Any ideas?

Sounds like you need ot reverse your tail servo in the tail servo setup. Power the bird up, for safety disarm your motor by unplugging it. Once the 3GX is initialized, rotate the nose right the blades on the tail should pitch opositite.
SOMEBODY double check me, I don't want to mis-inform the feloww about how the blades should respond

[extreme1]

I should have mentioned that I have the training gear on, and it spins violently before it lifts off the ground. This is my first FBL.

Should the tail correct when I move the helicopter nose left and right? It's not.

[bad007]

Tail gain set to low? Tail grip flip mod performed? Slider moves oposit on the pro with the grip mod. The slider moves right for right rudder, servo pushes control rod instead of pulling.
What TX and gyro settings?

[extreme1]

Well I fixed the spinning problem, the tail wasn't set-up correctly.

However, now the tail quickly wags back and forth, just before it lifts off. I've lowered the gain in the tx, but no changes. HELP

[koppterx]

could be too little headspeed or gain to high. a wag i would guess hs.

what radio?

[bad007]

Originally Posted by extreme1

Well I fixed the spinning problem, the tail wasn't set-up correctly.

However, now the tail quickly wags back and forth, just before it lifts off. I've lowered the gain in the tx, but no changes. HELP

Lowering the gain having no effect usually means there's a mechanical problem, tight links on the control rod, loctite got on brass bushings in the pitch control assy from putting loctite on the screws instead of in the holes etc.

[Pat Guit]

How did you fix it mine is doing the same thing.

[extreme1]

Pat,

I re-setup the tail. That stopped the spinning. Now I have a violent tail wag just before it lifts off. I'm using training gear until I get it flying correctly. I don't know how to fix tghe wagging tail.

[bad007]

Originally Posted by extreme1

Pat,

I re-setup the tail. That stopped the spinning. Now I have a violent tail wag just before it lifts off. I'm using training gear until I get it flying correctly. I don't know how to fix tghe wagging tail.

Gain to high, vibes. Been crashed or the tail blades hit something?

[markb50]

Make sure your gyro gain is on aux 2, NOT gear
in your radio settup.

[extreme1]

Thanks guys. The heli is brand new, never been flown. It is set on Aux2,

I just read something on another post about decreasing the gyro gain below 50% and seeing if the 3GX light turns red. Then setting the gains again. I'm gonna try that tonight if I have time.

[1004ron]

Originally Posted by extreme1

Thanks guys. The heli is brand new, never been flown. It is set on Aux2,

I just read something on another post about decreasing the gyro gain below 50% and seeing if the 3GX light turns red. Then setting the gains again. I'm gonna try that tonight if I have time.

Changing the gain from a Rate value to a HH value while noting the 3GX status LED change color is a confirmation that you have the TX and RX gain channel assigned correctly.

[bad007]

Originally Posted by extreme1

Thanks guys. The heli is brand new, never been flown. It is set on Aux2,

I just read something on another post about decreasing the gyro gain below 50% and seeing if the 3GX light turns red. Then setting the gains again. I'm gonna try that tonight if I have time.

Wells that's a must, it's in rm / red led and that's the mode the tail needs setup in.
In RM the servo horn should be 90ed and the the rod adjusted so there's some pitch on the tail blades, about 12mm between the tips when folded back. Then back to HH, gain above 50.

[extreme1]

Well I lowered the gain below 50 and the green light stayed on. It finally went off when I got down to 5. Should I keep it below 5 and re-setup the tail?

[Pat Guit]

I have to lower mine below 2.5 before the light turns RED. I don't know if this is normal???????
I tried what Bad007 said doing the tail setup un RM mode an it did not change anything. It start spinning just before take off and I broke the tail blade.

WO! someone said you have to be on AUX2, I have been told to be on GEAR now I am confuse?????

I can't wait to flight

[1004ron]

Originally Posted by Pat Guit

I have to lower mine below 2.5 before the light turns RED. I don't know if this is normal???????
I tried what Bad007 said doing the tail setup un RM mode an it did not change anything. It start spinning just before take off and I broke the tail blade.

WO! someone said you have to be on AUX2, I have been told to be on GEAR now I am confuse?????

You need to be on AUX2 if running two SAT's with the 3GX, but if using an RX, then the GEAR channel.

That's quite a common mistake, and that's why I suggest the below to confirm that the TX and RX channels are correctly assigned.

Originally Posted by 1004ron

Changing the gain from a Rate value to a HH value while noting the 3GX status LED change color is a confirmation that you have the TX and RX gain channel assigned correctly.

Getting the RED Rate mode LED come on down at 2.5 makes me think that your TX is something like a DX8.

With the DX8 0 to +100 is HH, and -100 to 0 is Rate mode.

[bad007]

Originally Posted by Pat Guit

I have to lower mine below 2.5 before the light turns RED. I don't know if this is normal???????
I tried what Bad007 said doing the tail setup un RM mode an it did not change anything. It start spinning just before take off and I broke the tail blade.

WO! someone said you have to be on AUX2, I have been told to be on GEAR now I am confuse?????

I can't wait to flight

Gear is for gov, gyro gain is on aux2. In the TXs initial setup check aux 2 setup.
The tail setup is simple, RM, red led the slider returns to the center all the time when there is no TX input or no tail movement. That's when the servo horn needs installed at 90deg. and the rod adjusted so there's some tail blade pitch. You must setup the TX so you can toggle RM and HH so you know your setup properally and can adjust the gain. As for tail compensation turning the helli nose left should pitch the tail blades toward the tail box.

[1004ron]

Originally Posted by extreme1

Well I lowered the gain below 50 and the green light stayed on. It finally went off when I got down to 5. Should I keep it below 5 and re-setup the tail?

If it just switched to Rate mode at 5, then take the gain down to around -50 for your setup in Rate mode.

At 5 it would be teetering between Rate and HH mode with no gain.

All dependent on what TX you're using !!!