How to change tail rotor - Protocol Thresher 3.5-Channel Remote-Controlled Helicopter

you can try amazon, but if your tail rotor is not spinning you should take off the canopy and make sure the leads are well connected,and if they are then get your self a new PCB Board,and if you just purchased it just return it, but if you had it for a while then follow the steps above good luck...

Instructions

1. • 1 Remove the main rotor blades, throttle up the helicopter while holding it in your hand and twist the helicopter from side to side to determine if the gyro is working. The gyro should make the tail rotor spin faster when the helicopter twists; you will be able to hear a difference. If the gyro does not appear to be working, replace it. Some gyros have a sensitivity adjustment screw; try making small adjustments if possible.
     
   • 2 Check the tail rotors and see if they are connected correctly. If the tail rotor blades are not pitched correctly they will not be able to hold the helicopter still.
     
   • 3 Test the tail rotor motor and see if it seems strong and responsive. Brushed motors, like those commonly used to drive tail rotors, can wear out in a relatively short time. Replacing the motor may solve your problem if the gyro seems to be working.
     
   • 4 Check the trim on your transmitter. Ideally the trim should be in the center of the stick movement. You may need to dial in some extra right trim or you may find the trim is set too far to the left.
     

If this model r/c helicopter has two counter rotating main rotors then it does not need a tail rotor.
Tail rotors are used to counter the torque rotation of a single main rotor r/c helicopter.

It appears that the tail rotor holds the horizontal stability when going backwards. i.e. only works when command is backward.
If the tail rotor does not spin then try lubricating the shaft with some talcum powder. To test whether it working blow down on to the rotor and it should spin rapidly. The talcum powder worked for me.

I own this heli also. The problem is that the tail rotor does not apply enough push to tilt the heli forward. It is this forward pitch that moves the heli forward. Aside form buying a stronger tail motor, upgrading your battery etc, the only thing you can do id this:

Get a credit card, a pair of scissors and some tape. Cut a couple of strips from the credit card about 2 1/2 - 3 times wider thhan the tail rotor blades and the same length. Now tape the strips to the top of the tail rotor blades. Make sure you don't increase the length.

This will help a little by providing more air push when the tail rotor in engaged. Without some serious modding, this heli will never be great.

I have more fun flying my micro size syma helicopter in the garage then I have flying my volitation. If there is even the slightest breeze, the volitation will float in the direction of the breeze and will not fly against it.

It seems tail motor is not working.
S107 knows to come with faulty tail motor.

If you open pilot cabin, you should see blue and red (or green and red) wire. See if they are welded on the motherboard.
If they are, then tail rotor is not working properly.

doubld blade rotor there is no need for a rear/tail rotor, on the remote are 2 buttons they will control Left/Right spin , adjust so that it does not spin around

yeah check out rctoys.com

Issue: Heli spins to the Left (counterclockwise) uncontrollably.
Problem: Tail rotor not turning fast enough, Dragging.
Background: My son's Heli Cage also started spinning to the left after he had flown it a couple 3 times. The trim and direction stick could not compensate. One time, the tail rotor came off during a crash. It was put back on and ran fine a couple more times until the dreaded left spin. I began to troubleshoot the issue. I checked for damage, hair and whatever else on the shaft. There was no obvious signs. When I pulled the tail rotor off, I noticed that it came off very easily. I put a new one on it and problem solved.
Diagnosis: the tail rotor shaft was spinning inside the rotor. This prevented the tail rotor from turning the correct speed.
Corrective Measures: replace rotor with new one. Avoid hitting the rotor while it is spinning...good luck! :-)

Yes - it matters for any heli.

The main rotor creates drag which makes the heli want to spin - the tail rotor pulls the heli in the opposite direction to compensate and keep it steady.

Look at the angle of the main rotor in regard to the direction it turns - you'll see how it 'pulls' upward. The tail rotor will need to 'pull' sideways, according to whichever direction the tail rotor is spinning.

I'm assuming you're reattaching a tail rotor or rewiring a motor?