Servo connection

[Michal]

Hello Gentlemen,
I have a question for experts. I have two servos connected with a split cable as shown in the picture. They are driving two independent flaps and would like them to rotate in opposite direction. I only managed to rotate them in the same direction. How to fix that? Thank you for any help

[Florin]

Hi Michal,

I'm not an expert, but since the servos are controlled by one channel, you have to install them physically "in opposite" orientation.
See image below:
So, assuming that both servos turn clockwise, the LHS AIL will go down (servo pull) and the RHS AIL will go up (servo push)

[Michal]

Thank you Florin but I would like to reverse them electrically by switching wires. Changing position of the servo mechanically would be a lot of rework.

[Florin]

1) Rotate the servo
2) Use an in-line servo reverser
3) Plug flap servos into different channels on the receiver and mix them.
4) https://youtu.be/hnd1zwouWV4
:)

[MichaelLevy]

https://hobbyking.com/en_us/turnigytm-servo-signal-reverser.html?___store=en_us

[Andrew Fernie]

Hello Gentlemen,
I have a question for experts. I have two servos connected with a split cable as shown in the picture. They are driving two independent flaps and would like them to rotate in opposite direction. I only managed to rotate them in the same direction. How to fix that? Thank you for any help
Do you have a spare channel on your receiver? If so, plug the two servos in different channels and use a mix on your transmitter to drive the second channel from the first, but inverted. Most transmitters these days can do this, although the details of how to set it up vary from model to model so tough to give specific instructions. If you have a removable wing you will have to connect the wires each time you assemble the plane and there is always a danger of plugging them in backwards. This will ruin your day if you don't catch it in your preflight checks so I put a piece of colored heat shrink tubing or electrical tape around the matching connector pair to make it clear which is which.

[Andrew Fernie]

Looks like you have an Orange T-SIX transmitter. If so, then section 9 of the manual describes the mixes. The "master" channel is the channel you are using now, and the "slave" channel is the one you plug the second servo into. Make sure that the mix is always active, not enabled by a switch. The amount of mixing should be 100%, and the trim option should be set to link to the active channel. I have never used that radio, so can't help much on the subtleties of the setup.

[Michal]

Andrew Fernie;57789]Looks like you have an Orange T-SIX transmitter. If so, then section 9 of the manual describes the mixes. The "master" channel is the channel you are using now, and the "slave" channel is the one you plug the second servo into. Make sure that the mix is always active, not enabled by a switch. The amount of mixing should be 100%, and the trim option should be set to link to the active channel. I have never used that radio, so can't help much on the subtleties of the setup.

Thank you gentlemen for your help, I have seven channels and could use the mixer but I think the servo reverser would be the easiest.

[Hector]

Reverse the servo direction by "switching wires" requires to modify the potentiometer wiring inside the servo; this means re-soldering each servo you want to reverse, you will have to modify both. There are few tutorials in YouTube. High risk of damaging the servo... it is deep waters.

The solution proposed by Andrew is IMO the best way to do it. Use the mix radio function to reverse servo direction. You only need to reverse one channel and keep using the Y cable

Below is the link for OrangeRx T-SIX manual
https://cdn-global-hk.hobbyking.com/media/file/278090152X1444783X13.pdf

Another option could be just flipping the servo and the servo arm, instead of pushing it will be pulling. It might require some modification to the servo bay and relocation of the flaps horns.

[Michal]

Reverse the servo direction by "switching wires" requires to modify the potentiometer wiring inside the servo; this means re-soldering each servo you want to reverse, you will have to modify both. There are few tutorials in YouTube. High risk of damaging the servo... it is deep waters.

The solution proposed by Andrew is IMO the best way to do it. Use the mix radio function to reverse servo direction. You only need to reverse one channel and keep using the Y cable

Below is the link for OrangeRx T-SIX manual
https://cdn-global-hk.hobbyking.com/media/file/278090152X1444783X13.pdf

Another option could be just flipping the servo and the servo arm, instead of pushing it will be pulling. It might require some modification to the servo bay and relocation of the flaps horns.

Thank you Hector, that is exactly what I did. Soldeing was a little challenging due to tiny size of connectors but I managed. The modified servo works.

[Hector]

Thank you Hector, that is exactly what I did. Soldeing was a little challenging due to tiny size of connectors but I managed. The modified servo works.

Oh boy, you took the long path! :)
I am happy to hear you managed to make it work :BOW:

[Ricardo]

Usually you need to swap the servo motor wires, to reverse the motor polarity, and the pot end to reverse the pot.
I could not do it in some servos because they were pcb mounted and I did not want to go cutting traces.

The transmitter mixer approach is the best idea. I personally like to standardize my servos to keep minimum spares, so would not like to start customizing them.

[Michal]

Usually you need to swap the servo motor wires, to reverse the motor polarity, and the pot end to reverse the pot.
I could not do it in some servos because they were pcb mounted and I did not want to go cutting traces.

The transmitter mixer approach is the best idea. I personally like to standardize my servos to keep minimum spares, so would not like to start customizing them.

Thank you Ricardo. My servo was easier to switch wires. The motor connectors were exposed when I opened the servo and a decoder was attached with a screw. I could pull it out and have a good access to solder wires.