stumped with this AR7200BX . my servo travel is sluggish and short?!

[Turked]

I've been here all day trying different lipos, the flight pack to see if the servos are moving (if at all) next to nothing because of a low voltage..... I went through every step in both setup (solid light) and parameters (blinking) mode. I am running Savox 1250MG s on cyclic and an oUtrage torg 9188 tail servo. I went to beastx.com (here to be exact: www.beastx.com/service_servoliste.php) and set up my servos according to those frequencies.

I have all trims disabled on my DX8. Linear 0-100 pitch curves.

My tail is working flawlessly. Snappy and crisp.


Its just these servos that are moving very very minimal. Its almost hard to see a change in the swashplates angle whatsoever.!


The way I know the servos are working is when I am in setup menu I (swashplate servo directions) the servos move normally. Crisp and fast. Just the way they are supposed to.

But when I get out of set up the servos BARELY move.


I really want to maiden this Goblin 500 today, but I'm thinking about packing it up for the day unless so awesome peeps can help me out......

[Spunjah413]

Slow movement when not in setup is completely normal when on the bench. As long as they are full speed in step L when adjusting limits, you are good to go. I normally move the servos a lot in step L to check their speed.

Now stop worrying and get that thing airborne!

[sutty]

Slow is normal, but moving so little you can barely see them move isn't acceptable and you shouldn't fly it. If I move the cyclic on any of my MB helis I can easily make the swash go to full deflection. I don't know what it is, but hopefully others will have suggestions. To re-visit step J, and step L, would be good. If step J is set to a tiny angle by mistake the swash doesn't move much then when in flight mode.

Cheers

Sutty

[sutty]

What do they do in response to collective input?

[Spunjah413]

When I'm not in setup, none of my AR7200BX units will do full deflection (exactly as in step L), and its terribly slow. This looks to be what he's describing, so it looks very normal to me.

If you are moving cyclic fully, and see zero or almost no movement in the swash, something may be wrong.

Altho if there is correct movement, just slow and not full travel, I personally would take it airborne.

Double check DR and Travels to be sure.

[sutty]

I definitely wouldn't. He can barely see them move. Checking Tx rates is a good suggestion though.

Cheers

Sutty

[Turked]

[ame]http://youtu.be/SfArgTJCarE[/ame]

[Spunjah413]

That is not normal, you should be getting near full deflection.

Are you sure the frequencies are correctly set for cyclic?

Double check step M also to make sure the sensor direction is correct

[sutty]

Okay, if they move like this, you are good to go. If they don't, and they barely move, then I would say you are not.

From this you will see that collective is snappy and quick. Cyclic is not so fast, but still far. Notice how slow it is to recover to centre when left alone. It still follows the sticks quickly though when stirred.

Not the best video, I just threw it together with my phone, but hopefully it gives you an idea.



Cheers

Sutty

[Turked]

Originally Posted by Spunjah413

Are you sure the frequencies are correctly set for cyclic?

Double check step M also to make sure the sensor direction is correct

I've triple checked the frequencies and they are set according the the BeastX servo reference chart.

The sensor directions are correct as well.....

Originally Posted by sutty

Okay, if they move like this, you are good to go. If they don't, and they barely move, then I would say you are not.

From this you will see that collective is snappy and quick. Cyclic is not so fast, but still far. Notice how slow it is to recover to centre when left alone. It still follows the sticks quickly though when stirred.

Cheers

Sutty

Yea, I posted a video, too...

Somethings up..... I dont know what, but somethings up.

[sutty]

It wouldn't be quite how you showed it in step i, because in set-up there is no involvement from the control loops, but for sure it should have more travel than you have.

They are a little slow, like my video shows, but they clearly move, and reasonably quickly.

As mentioned, check if you have reduced ATV or dual rates in your radio, and double check step J. It teaches the MB about the geometry, and if it thinks a tiny amount is 6 degrees, because for example, say you revisited J, and just caught the aileron, so it is set to 0.1 degrees, or hasn't been set at all, then I think you do get what you have shown.

I will test it on my 450 now.



Cheers

Sutty

[Spunjah413]

When you pick up the helicopter with everything on does the swashplate actually correct and move as intended?

During steps M and N, when you pick up and move the heli, does the swash fully move as intended?

During step J, did you actually exit setup at 6Deg cyclic?

As a last ditch resort if all steps work right In setup, I would try selecting a new model in your TX and set up everything fresh.

[sutty]

Yep, tested it. Super low J, gives exactly your symptoms. I can video it if you like, but no point, as I can tell you it is the same. i is fine, flight mode is almost nothing, in both collective and cyclic.

Not saying that is it, but it definitely looks the same.

Try setting J to 6 degrees again.


Cheers

Sutty

[Spunjah413]

Originally Posted by sutty

Yep, tested it. Super low J, gives exactly your symptoms. I can video it if you like, but no point, as I can tell you it is the same. i is fine, flight mode is almost nothing, in both collective and cyclic.

Not saying that is it, but it definitely looks the same.

Try setting J to 6 degrees again.


Cheers

Sutty

Good information for sure. I wondered what would happen if 6 deg wasn't actually set correctly. Wonder if the OP set 6 and saw Blue, then went back to 0 prior to leaving step J. Or maybe J was never set at all.

[acrow]

Hi Turked

Here's another suggestion. The DX8 allows you to slow down servo response. Make sure that you haven't activated that. Check that the servo speed setup for each servo is set to "Norm". You access it from Function -> Servo Setup -> Speed.

Regards

Acrow

[Turked]

Yea guys that was it. I mustve tapped the aileron stick while going through setup J....



What's the proper way to go through Setup menu J?

I have an RC Logger, but I'm confused.....

[sutty]

Good to hear. Yeah, when passing any set-up step, just press the button to move on, and keep the Tx out of reach, so it can't be knocked and amend any settings by mistake.

Cheers

Sutty

[sutty]

Ah, sorry, I misunderstood.

First, step G must be done correctly. You must have a level swash and 0 on the blades, with a light on in step G. Step G, with a light on, is the starting position for step J.

Then you go into J, with your blades front to back, and your blades must be 0, because they were at zero in G. Put the pitch gauge on and zero it, and then move the aileron until you get 6 degrees. Check the colour on the MB and let us know. Whilst it is sitting there on 6 degrees, press the button to move on.

Having adjusted J, you have to do K and L again.

Cheers

Sutty

[Turked]

Originally Posted by sutty

Ah, sorry, I misunderstood.

First, step G must be done correctly. You must have a level swash and 0 on the blades, with a light on in step G. Step G, with a light on, is the starting position for step J.

Then you go into J, with your blades front to back, and your blades must be 0, because they were at zero in G. Put the pitch gauge on and zero it, and then move the aileron until you get 6 degrees. Check the colour on the MB and let us know. Whilst it is sitting there on 6 degrees, press the button to move on.

Having adjusted J, you have to do K and L again.

Cheers

Sutty

Okay, well she flew, but I think I have too much cyclic pitch because it feels like it loads the disc too much.

So when you say have the blades front to back you mean fully extended as if you were ready to fly and straight, parallel to the boom running from head to tail?

I was folding the blades as if ready to store with a blade holder and set pitch on both sides like that. I'm such a dummy!

Time to set cyclic pitch the right way.

I'm just going through the whole setup again.

Thanks guys you all rock

[sutty]

Hi Turked, Best bet is to watch the set-up videos in the stickies at the top of the forum. Or click on the link below.

There are a set of videos one for each step, so it is easy to watch over and over for the one you want.

Individual set-up step videos

Cheers

Sutty