Flybarless first flight.

[Ian.M]

Hi all,
Over christmas I have been building up a new Trex 700 FBL 3GX, everything appears to be set up spot on, all pitches perfect swash level etc etc it is as near to recommended settings as I have ever got any heli build,but it is still my first flybarless heli.
So today I decide today is the day to get some hovering in and run the engine in a little (OS 105), now this is not my first big heli and I am used to flying a Henseleit 3DNT bit old school but still a nice heli, so I fire her up and she settles straight into a nice idle, slowly I raise the collective and up come the revs and head spools up nicely. Now this is when it all gets a bit sketchy, once in the air I put her into a hover at about six feet and immediately found the heli a proper handfull ie; any aileron/elevator movements had her shooting in all directions. Quickly got her down again and decided to re-check all my mechanical and 3GX settings, all OK.
So here is the question I guess, is the flybarless system so much more direct that I need to re-learn my flying from flybarred? and is the Henseleit so different that I was unrealistic in thinking I could just stick the Trex into the air and get on with it? Has any body here also changed from FB to FBL and found similar?
I am certainly no pro but can usually fly without heart stopping hovers.

Any thought's views or opinion's appreciated,

Cheers Ian.

[raptorheli2]

fbl does feel slightly diff but not uncomfortably so. i would hazard a guess there is something wrong setup wise.

it sounds like you have too much cyclic pitch. redo the setup and confirm you have only 8 deg of cyclic and 11 or so of pitch.

cheers

[milly0812]

Flybarless first flight.

The 3gx can be a handful compared to other fbl. Have a chat with COOLICE (Ian) very few have as much experience with that system. I setup and flew one for a couple of flight and it wasn't anywhere near as lively as you described so maybe there is a setup issue or you have the gains way too high ;-)

[GIXERMAN]

If you haven't done already turn down the elev and aileron rates in software, try around 220 this should be to lively but not lazy, and also expo in your tx try 20% to start. Also wot software u on 2.1 or 3.0?

[Ian.M]

Thanks for the reply,

When you say pics of the sensor setup do you mean physical placement or gain pot position? I currently have both pots at twelve O'clock. As for vibration it maybe hard to tell any high frequency vibes are present but using the MK.1 eyeball she appears very smooth running with no noticeable vibration.
I am beginning to think maybe some tweaking of the 3GX is in order to calm things down until I get more used to the heli?

Cheers, Ian.

[raptorheli2]

Ian, i edited my post after i re-read what you put. sorry it was a bit cluttered on ipad with no breaks.

cheers

[Ian.M]

Hi Gixerman,
I have set the 3GX up solely on V3.0 so never had any other update/issue.
Good point about the rates in software will check again what I am at.

Hi Milly0812,
Good idea about gains, set up has been based on previous experience with FB heli's.

Many thanks,
Ian.

[Delarado]

I Agree, the 3gx is a bit of a handful sometimes! how much expo do you have programmed into your transmitter? what did you set the flip and roll rates at in the 3gx menu? have you plugged it into a computer?

I normally run 70% flip and roll rates (3 solid lights 1 flashing if your doing it through the 3gx menu) in the 3gx unit with no expo (Expo 0, can only be done on PC i belive) and then set about 40% expo on the TX itself and then adjust flip and roll rates using the D/R feature. 70 for sedate flying, and 90 or 100 for 3d/acrobatics.

The 3gx can be very agressive if left un-tweaked.

[tomatwalden]

So here is the question I guess, is the flybarless system so much more direct that I need to re-learn my flying from flybarred? and is the Henseleit so different that I was unrealistic in thinking I could just stick the Trex into the air and get on with it? Has any body here also changed from FB to FBL and found similar?
I am certainly no pro but can usually fly without heart stopping hovers.

Any thought's views or opinion's appreciated,

Cheers Ian.

Well, not quite in the same league, and I'm still a relative beginner, but when I moved from my flybarred 450-3D to a flybarless 450x - I found it much easier - far more stable. Personally I think that if everything is right, flybarless should be easier. I would guess you have a problem in the setup somewhere ... Have you got the compensation directions right?

[Delarado]

Well, not quite in the same league, and I'm still a relative beginner, but when I moved from my flybarred 450-3D to a flybarless 450x - I found it much easier - far more stable. Personally I think that if everything is right, flybarless should be easier. I would guess you have a problem in the setup somewhere ... Have you got the compensation directions right?

It'd be in the ground if they were wrong, no question. It wouldnt even lift off, itd just tip over and self destruct.

[tomatwalden]

PS. The 3GX on my 500EFL is on v2.1 with out of the box settings and it flies beautifully stable.

[Ian.M]

It'd be in the ground if they were wrong, no question. It wouldnt even lift off, itd just tip over and self destruct.

Yes dead right about that one. I really think I now need to set up the 3GX with some softer settings, as per Elderado and Gixerman have pointed out.
The fun of a new 3GX eh?

Thanks, Ian.

Oops sorry Delarado moment of dyslexia.

[tomatwalden]

It'd be in the ground if they were wrong, no question. It wouldnt even lift off, itd just tip over and self destruct.

Odd though. On a new 700 out of the box, it should be just peachy! The bit in the OP below makes it sound like something is badly off.. ?

Now this is when it all gets a bit sketchy, once in the air I put her into a hover at about six feet and immediately found the heli a proper handfull ie; any aileron/elevator movements had her shooting in all directions.

Doesn't that sound to you like wrong compensation?

[Ian.M]

Odd though. On a new 700 out of the box, it should be just peachy! The bit in the OP below makes it sound like something is badly off.. ?



Doesn't that sound to you like wrong compensation?

Not really, TBH if compensation was wrong I would have found this in initial DIR setup and on first spoolup I always sight the rotor's to check all movements are correct.

Ian.

[tomatwalden]

Not really, TBH if compensation was wrong I would have found this in initial DIR setup and on first spoolup I always sight the rotor's to check all movements are correct.

Ian.

Yup - fair enough! I'm just a bit surprised that out of the box it's that twitchy! I'm using Coolice's settings on my 450, but with my 500 I stayed with the out of the box parameters. If anything I suspect most 3D flyers would find my 500 too stable!

Anyhow - hope you get it sorted!