AR7210 Servo Connection

[canadien007]

Hello Folks

Is there a specific sequence of connecting the servos to the FBL unit?

For example, CH1-AIL, CH2-PITCH, CH3-ELEV, and CH4-RUD?

[rhodesengr]

it is documented in the Wiki
The cyclic servo connections are documented in the section for Setup B
http://wiki.beastx.com/index.php/Man...Setupmenu_B/en

and the tail servo is shown in Setup C

or the quickstart guide around page 15
http://www.beastx.com/download/manua...rt_EN_3116.pdf

and also in the full manual starting on page 33 depending on which of the several manual versions out there
http://wiki.beastx.com/images/3/37/M...n_4.x.x_EN.pdf

CH1 is elevator, CH4 is rudder, and CH2&3 go the other two cyclic servos. It doesn't matter which is which until after you sort out the directions. Then you can't swap 2&3 unless you do the setup again.

[canadien007]

Originally Posted by rhodesengr

it is documented in the Wiki
The cyclic servo connections are documented in the section for Setup B
http://wiki.beastx.com/index.php/Man...Setupmenu_B/en

and the tail servo is shown in Setup C

or the quickstart guide around page 15
http://www.beastx.com/download/manua...rt_EN_3116.pdf

and also in the full manual starting on page 33 depending on which of the several manual versions out there
http://wiki.beastx.com/images/3/37/M...n_4.x.x_EN.pdf

CH1 is elevator, CH4 is rudder, and CH2&3 go the other two cyclic servos. It doesn't matter which is which until after you sort out the directions. Then you can't swap 2&3 unless you do the setup again.

thanks so much. that explains the wierd swash behavior even after completing the setup.

[canadien007]

Okay so I have everything setup and I mainedned today.

I might have to trim the heli a little to get a hands off hover.

The only problem I'm encountering is that I have to constantly give right rudder input to keep the tail from going in circles counter-clockwise. when I let go off the rudder stick the heli abruptly turns CCW.Am I missing something?

[rhodesengr]

Originally Posted by canadien007

when I let go off the rudder stick the heli abruptly turns CCW.Am I missing something?

A one shot tail jump or it wants to spin? Does it want to spin on spool up if you don't use lots of rudder?

Something is definitely wrong then with your tail setup. You may have the mounting orientation wrong. When I did mine last year, there was a misprint in that part of the setup guide. It showed two LED colors for the same mounting. Otherwise, your tail feedback is wrong. You have to make sure both the control direction and feedback direction are correct. Turning the nose left should give right rudder feedback. There is a nice video on Youtube that I found very helpful but I don't have the link with me (on travel). I can try to find it for you later.
It is also possible you got your tail blade links backwards. The links should be leading edge rotation.

[rhodesengr]

here is the video

How to: Check gyro and tail compensation on RC Helis (1 min 26 sec)

If you do the feedback part turning the nose and the tail barely moves, then you probably have the wrong mounting orientation set. The motion should be obvious. When I first set up mine, it bare;y moved. If you search back, you should be able to find my posts about the misprint.

[canadien007]

Originally Posted by rhodesengr

here is the video
https://www.youtube.com/watch?v=Gj59Ovxz2pQ

If you do the feedback part turning the nose and the tail barely moves, then you probably have the wrong mounting orientation set. The motion should be obvious. When I first set up mine, it bare;y moved. If you search back, you should be able to find my posts about the misprint.

I checked the mounting orientation a few times just to be sure. The 7210bx is installed on a Compass Exo 500. It is flat, sticker showing to ground, socket pointing to front.

Ill double check it again tomorrow just to be on the safe side. that video you shared makes it so much easier to understand. from what I can remember the tail blades were doing what they are suppose to, but, Ill have a look at that as well tomorrow.

[canadien007]

Originally Posted by rhodesengr

A one shot tail jump or it wants to spin? Does it want to spin on spool up if you don't use lots of rudder?

I was too scared of lettkng it make a full 360 spin

It does, however, want to spin on spool up if I don't use lots of rudder.

[rhodesengr]

Then almost certainly your tail feedback is reversed. I forget if you set the feedback explicitly or if is just a result of other settings like mounting.
I am surprised you could fly it at all that way. It is normal to get a small yaw on spool up until the rpm gets high enough but it should never spin.

[canadien007]

Originally Posted by rhodesengr

Then almost certainly your tail feedback is reversed. I forget if you set the feedback explicitly or if is just a result of other settings like mounting.
I am surprised you could fly it at all that way. It is normal to get a small yaw on spool up until the rpm gets high enough but it should never spin.

it was a stupid mistake on my part. I never set the gyro gains in my DX8. Gyro was INHIB

This is my first time setting up a FBL unit on my own from start to finish. just thought I'll mention that hehehe

I currently have the gains at +61 and -75. At +61 the tail is still 'hunting' and when I give it slight right rudder input on the rudder stick, the tail kicks to the right/ nose to the left(view: from the tail looking forward).

[rhodesengr]

Originally Posted by canadien007

I currently have the gains at +61 and -75..

-75? Why would you want rate mode? Go by what the BX is telling you. Set a couple different gains and change them with a switch. The BX will indicate the gain level it thinks it is getting. It will light up on boot unless you have Rescue setup. Then it will light up if you make a change. You want at least G and maybe H. I think my 550x runs AROUND 70.

[sutty]

Not sure if the description is accurate, but if the tail goes to the right when you give right rudder, perhaps your rudder is reversed. The nose should follow the stick, not the tail.

[canadien007]

Originally Posted by rhodesengr

-75? Why would you want rate mode? Go by what the BX is telling you. Set a couple different gains and change them with a switch. The BX will indicate the gain level it thinks it is getting. It will light up on boot unless you have Rescue setup. Then it will light up if you make a change. You want at least G and maybe H. I think my 550x runs AROUND 70.

I don't understand th3 difference between rate mode and heading hold mode.

I've got an exo 500, so the gains should be still fine around menu G or H?

[canadien007]

Originally Posted by sutty

Not sure if the description is accurate, but if the tail goes to the right when you give right rudder, perhaps your rudder is reversed. The nose should follow the stick, not the tail.

thanks for catching my mistake. I actually typed it out wrong. the tail DOES kick to the right (looking forward from the tail) after applying LEFT rudder and letting go of the stick.

[rhodesengr]

Originally Posted by canadien007

I don't understand th3 difference between rate mode and heading hold mode.

I've got an exo 500, so the gains should be still fine around menu G or H?

You should goggle about that. Rchelicopterfun.com is a good resource. But 99.9% you want HH mode. Plus gain values give HH. Negative gains give Rate mode. I suggest you set 3 positive gains. Try 68 70 72.
Switch around and see which led lights up. Fly and see how the tail works. If gain is too high you will get a fast wag. Reduce quickly if that happens

[rhodesengr]

But if you have firmware for rescue AND trying to combine tail gain and rescue on one channel the story is different. You have a dx so no reason to do that.

You should read the wiki more too. All of this is described there.

[canadien007]

Ill try setting it up Saturday as my 5 day weekend starts then.

[canadien007]

Okay so I got a little bit done. the tail hunting is gone.

The heli still wants to spin CCW. I bought this used so the previous owner was flying it, therefore, the previous owner would given a little mechanical bias on the tail blades.

Is there anywhere in the setup where I can define where the tail centres? Or would I need to adjust the tail rod?

[bad007]

Originally Posted by canadien007

Okay so I got a little bit done. the tail hunting is gone.

The heli still wants to spin CCW. I bought this used so the previous owner was flying it, therefore, the previous owner would given a little mechanical bias on the tail blades.

Is there anywhere in the setup where I can define where the tail centres? Or would I need to adjust the tail rod?

No need for tail centers
Power the FBL unit and a led A-N will stay on for a few seconds indicating gyro gain and status led should be blue for HH
Set gain so F lights up, during adjustment it will light back up.
Rotate Heli CCW, the sider should move to the boom, screws for tail blades should go in facing the boom if the tail grips are installed properlly.

[canadien007]

Originally Posted by bad007

No need for tail centers
Power the FBL unit and a led A-N will stay on for a few seconds indicating gyro gain and status led should be blue for HH
Set gain so F lights up, during adjustment it will light back up.
Rotate Heli CCW, the sider should move to the boom, screws for tail blades should go in facing the boom if the tail grips are installed properlly.

Not sure why I am in Heading Hold mode when my gyro setting is in (-) value.

Should It not be the other way around?

Heading hold = positive gain values
Rate Mode = Negative Gain values