Flybarless first flight.

[Delarado]

Tom, the compensation is what the 3gx does to correct any roll movements.

Heli rolls left. 3gx compensates right.

If it was the wrong way round, if the heli rolled left, the 3gx would compensate left. The more left the heli went, the more it would compensate left. So itd go more left, and then compensate more left. Itd end up in the ground in a second.

It sounds to me as if the OP is just not running any/much expo compared to a flybarred machine FBL are lively. My FB 450 I used to run no expo at all and it was just peachy. All of my FBL machines run 40%. I accidentally flew my 500 once on 3gx with no expo, and I almost crashed.

I dont use 3gx anymore but I have flown a multitude of models with them. They are lively, and need expo to calm them down!

[Delarado]

by all means check your compensation, but i think the key is in your 3gx programmed flip and roll rates and expo in the tx here.

[Delarado]

http://www.rcheliaddict.co.uk/align-...3gx-setup.html

"flight mode settings" section

[Ian.M]

by all means check your compensation, but i think the key is in your 3gx programmed flip and roll rates and expo in the tx here.

Yes couldn't agree more, so next step is to re-set rates in software and go again,

Thanks again for all the input, real help.
Ian.

[Delarado]

what expo do you have in the TX at the moment? I think thats going to be the main improvement. What TX Is it?

[tomatwalden]

Tom, the compensation is what the 3gx does to correct any roll movements.

Heli rolls left. 3gx compensates right.

If it was the wrong way round, if the heli rolled left, the 3gx would compensate left. The more left the heli went, the more it would compensate left. So itd go more left, and then compensate more left. Itd end up in the ground in a second.

It sounds to me as if the OP is just not running any/much expo compared to a flybarred machine FBL are lively. My FB 450 I used to run no expo at all and it was just peachy. All of my FBL machines run 40%. I accidentally flew my 500 once on 3gx with no expo, and I almost crashed.

I dont use 3gx anymore but I have flown a multitude of models with them. They are lively, and need expo to calm them down!

Yup - I get the function of compensation! The angle I was coming from was (on the assumption that Ian is a relatively experienced pilot), was that just a lack of expo wouldn't be enough instability to force a "get it down again quickly" situation. I wondered therefore if somebody with reasonable cyclic skills could manually compensate for wrong compensation (if you get what I mean!). So, the heli starts to roll left - and as you say, wrong compensation would exacerbate this .... but, if the pilot gave right input quick enough - could the hover be held?

Honestly, don't know, but I suspect you're absolutely right that it would go wrong so quickly, and that nobody could hold it ..

.. Frankly - I won't be testing my theory on any of my helis!

[NoFixedAbode]

Re: Flybarless first flight.

Tom, the compensation is what the 3gx does to correct any roll movements.

Heli rolls left. 3gx compensates right.

If it was the wrong way round, if the heli rolled left, the 3gx would compensate left. The more left the heli went, the more it would compensate left. So itd go more left, and then compensate more left. Itd end up in the ground in a second.

It sounds to me as if the OP is just not running any/much expo compared to a flybarred machine FBL are lively. My FB 450 I used to run no expo at all and it was just peachy. All of my FBL machines run 40%. I accidentally flew my 500 once on 3gx with no expo, and I almost crashed.

I dont use 3gx anymore but I have flown a multitude of models with them. They are lively, and need expo to calm them down!

Wow 40%! Anyone else run expo? I never have, perhaps I should start.

[vinny155]

Wow 40%! Anyone else run expo? I never have, perhaps I should start.

yep 20 on cyclic and 30 on the tail

[Ian.M]

what expo do you have in the TX at the moment? I think thats going to be the main improvement. What TX Is it?

All expo at o%, like you I also have a 450 FB and it flies with a hands off hover, as does the Henseleit. Oh and TX is a Spektrum DX7s.

[Delarado]

stick your expo at 30% as a starting point. I bet you dont need to touch anything else after that!

[1chris]

I run 20% expo on cyclics and 10% on tail, T rex 700N flies really good, much better for me than flybarred, I use the scotch double sided tape to mount the 3GX to the helicopter, it has a superb stable hover, really fast and crisp during manoeuvring, I use the standard Align set up with the Leon Luke settings, tweeked as per his published list

Something is not quite right on your TRex 700

[Stu girdler]

Ian
like many have said it may just be your gains are a bit high or (and I've done this myself) you may have to much throw in the setup.

i always take a jumpy Heli as a bit of a warning, go back through each setup stage, if you find nothing then it's maybe a vibration or mechanical issue, but, if you do find the issue you will be very happy with yourself but more importantly you will have saved a fortune should you have crashed.

regards
stu