Align T-rex 550X ta...
 
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Align T-rex 550X tail pitch neutral setting when using Brain 2

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mjolund
(@mjolund)
Active Member Customer
Joined: 1 month ago
Posts: 3
Topic starter  

Hi.

In the manual for the T-rex 550X it is described to set up the tail rotor pitch neutral position with a slight offset adding some torque to counteract the main rotor. The heli comes with a BeastX FBL, so the explained mechanical setup is probably optimized for that unit. My question is: is such an offset optimal also when using the Brain 2, or should I go with zero degree pitch in neutral position and let the Brain deal with counteracting the main rotor?


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Jimmy
(@jimm-y)
Eminent Member Customer
Joined: 1 year ago
Posts: 29
 

I had issues when I 1st setup my 470 and ended up setting zero tail pitch, just been setting up my 500 and I've done same and again no issues, solong as your not going to flyning rate mode


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Jimmy
(@jimm-y)
Eminent Member Customer
Joined: 1 year ago
Posts: 29
 
Posted by: @jimm-y

I had issues when I 1st setup my 470 and ended up setting zero tail pitch, just been setting up my 500 and I've done same and again no issues, so long as your not going to flying rate mode

 


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BrainDev
(@customercare)
Reputable Member Admin Registered
Joined: 4 years ago
Posts: 836
 

If you will only and solely use the tail gyro in Heading Lock mode and never use Rate Mode then it is not essential to mechanically adjust the tail to perfection because Heading Lock can compensate for even mechanical tail setup errors.

However, if you plan in the future to use Rate Mode as well then it is absolutely necessary to mechanically adjust the tail so that in Rate Mode, with zero tail stick control and servo horn at 90° to the tail control linkage, the tail blades are tilted to counteract the torque generated by the main rotor and so that in Rate Mode in flight the model does not rotate on itself.

This is achieved by lengthening or shortening the tail control linkage or by sliding the tail servo forward or backward (if it is mounted on the tail boom). However, you should not change the position of the tail servo horn, which in Rate Mode and tail stick in the center should remain at 90° to the tail control linkage.

However, this setup does well even when the gyro operates in Heading Hold because the tail control power will be equal and identical in the two directions of rotation.

Never use transmitter trimmers for these tail adjustments because each time the flight controller is restarted, the trimming values would be offset and reset. Therefore, it would be a completely useless adjustment valid only for that one power-up of the flight control unit and no longer valid at subsequent times.


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mjolund
(@mjolund)
Active Member Customer
Joined: 1 month ago
Posts: 3
Topic starter  

@jimm-y Thanks for responding. I’ll try this and see how it feels 😊 


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mjolund
(@mjolund)
Active Member Customer
Joined: 1 month ago
Posts: 3
Topic starter  

@customercare Thanks for responding. I’ll probably test both zero pitch and some offset to get a feel for it now that I know both are valid options 


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Jimmy
(@jimm-y)
Eminent Member Customer
Joined: 1 year ago
Posts: 29
 
Posted by: @mjolund

@jimm-y Thanks for responding. I’ll try this and see how it feels 😊 

Be interest how you get on if you do try both ways.


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