GT-5 Gyro Touch Flybarless System

[superflY851]

OK so I think i figured out how to set up the pitch range and cyclic range. I have been reading the thread for Henseleit helicopters.
http://www.helifreak.com/showthread.php?t=343454

It's easy to set the pitch range. Just go to the pitch menu and adjust the value number and it should adjust both the upper and lower pitch the same as long as you have your zero pitch set. Read post #131.

http://www.helifreak.com/showthread.php?t=343454&page=14

Now for the cyclic pitch, turns out the manual has an error. Read post #87 and #136

You don't really have to set the ail and elev pitch to 6deg. Sounds like what they are saying is just fly it and see how fast it rolls and flips. If you want a slower or faster roll you can adjust the settings for aileron and elevator. I'm still unclear if i should adjust the radio endpoints or the settings in the GT-5. I'll try the radio endpoints first and see what happens.


I have not flown it yet so hopefully it works.

[nightrider]

superfly851,

I was only going through this last night setting mine up. If you read the instructions about a 100 times a light turns, well thats how long it took my light to turn on!

As you mentioned Edvard seems to have all the info about the GT5, mine will be going for its maiden in about 3 hours!

[Edvard R]

...mine will be going for its maiden in about 3 hours!

And how did it go?

[Edvard R]

Tried out the GT5 today on my T-Rex 700N. This unit is not very good with vibration is all I'll say for now. More testing to come this weekkend. I'll post back with results.

I assume you set the heli-type to Nitro? Did you adjust the filter intensity in the sensor menu?

I have one on a 700N too, and it is smooth. Use 1 or 2 layers of 3M tape, even on nitro.

[superflY851]

Well I tried it for the first time today with my Trex 600N. It was a bit cold today 45deg 25mph winds with 35mph gusts. All i can say is wow. This thing handled perfect. Almost a hands off hover, I could feel the wind but the heli didn't.

No oscillations on the cyclic or tail. Fast forward flight was good. Flips rolls and piros were also good.

I set the total gain to 100 on my radio and left all the other gain settings default in the unit. I did set my Elev and Aile endpoints back to 85 on the radio. It seemed like it had too much throw on the bench. That worked pretty good in the air.

It felt fairly docile with the default settings. I had my oldschool flybar set up fairly fast. I think i need a higher pitch setting with more pitch response and faster piro rates with more rudder response.

[jockstrap]

Folks - just a heads up..

I have been informed by another member that the vibration filter that goes from 0-5 has been documented incorrectly with 5 as max..

I have been informed that in fact 5 is the LEAST filtering so akin to no vibration filtering, this may explain when some nitro people have been unsuccessful even with setting level 5.

I urge them to actually try a lower level..

This was apparantly confirmed by the developers but i'v only received this 2nd hand at this stage.

source --> http://www.archeli.com.au/forums/showthread.php?t=149392

[nightrider]

Edvard,

It flew well, very well in fact. The engine is still brand new so its just running in at the moment but even with the engine quite rich it still handled very well, also I didnt seem to have the vibe problems some are speaking of (I have the unit mounted on the supplied gyro tape). This is my first fbl heli and the GT5 was reasonably easy to set up. There are a couple small settings that will need a tweek once the engine is run-in but for now its flying very well.

[rexxigpilot]

I assume you set the heli-type to Nitro? Did you adjust the filter intensity in the sensor menu?

I have one on a 700N too, and it is smooth. Use 1 or 2 layers of 3M tape, even on nitro.
I tried all 1-5 vibration filter settings. It didn't help with the roll axis glitching I'm getting. Maybe my GT5 is defective?

Regarding extra tape, it was my understranding that the newer sensors all work best when hard mounted to the heli, as in use the tape provided. Is that not the case with the GT5?

[ranma103]

Well after finding out about the issue with the vibe filter I took my X50 out for a fly yesterday. I was very impressed the heli sat like a rock but did not have the robot feel i've had from the vbar. While flying I made a few adjustments droped my total gain to 96% then I droped the eli and ali gains in the swash menu to 75% as I found the rates to be real quick. Still more testing to come.

Sent from my GalaxyTab using Tapatalk Pro

[mrultralite]

I'm not so sure about this anymore, on the other thread, i learn that i can't adjust 'total gain' whatever that is, without a 7 ch Tx . How many here are using the DX6i?

[NitroAl]

Why can't you use the gyro gain channel? That's how I set mine up!
I don't know if you can assign a switch for different gain settings like I have in my DSX11 but you could set it up so you have say 60% in normal 85% in idle1 and 100% in idle2 just for the initial set up procedure so you can find the optimal gain!

[mrultralite]

Yes there's something about that in the manual , just not sure how yet.

[superflY851]

I thought that was strange also. The manual says that when using the satellite receivers, the 7th channel is for total gain. But you only need 6 channels for an electric heli. You could just use a normal receiver and it's a non issue or just pick up a used DX7 for cheap.

I'm using mine on a nitro with a normal receiver and my 7th channel is for my governor so i can't test it.

[Stolla]

Mine is on gyro channel and linked with id ups same as normal gyro

[seemore74]

Ok, got my GT5 the other day & have her pretty much setup, ive discovered using futaba Sbus Rx, my tail gyro is on chnl7 which forces me to use chnl7 end point adjust in my Tx to control gyro gain.
Is there any way of putting gyro gain on chnl5 in the GT5 so that I can control tail gain in my gyro menu on my Tx (Futaba 10c)?

[HeliBenj]

On the 8FG I cna re-assign any function to any channel, not sure if this is posible on the 10C? Alternatively on channel 7 can't you just assign "GYRO"? Sorry don't konw the 10C
Also be aware the gain on channel 7 is total gain, it will effect tail gain and cyclic gain proportionnally. This is meant to have different gains for different headspeeds.
Of course you can use it to find your tail gain at first and just ignore main gain, once you're happy with the gain at certain headspeed check the number of total gain on the unit. If you get say 50% on the unit where you are happy and the P gain in tail PID menu is 80% then your gain for tail is 40%. You can then out 40% as P gain and up total gain to 100% for this headspeed. Then if you use a faster headspeed just tweak total gain for that headspeed (lower total gain) and vice versa.
Hope I did not confuse you more :DOH

[seemore74]

:thinking: confused: I'll look into this further & I should get it then.
It does seem like a very promising FBL unit though.

[HeliBenj]

Also if you can't use the gyro menu you can still use end points on channel 7 to effect gain. Just check on the gt5 display that it actually moves as you move endpoints

[seemore74]

Ok, another question, if chnl7 on the GT5 is for proportional gain between tail & head (if i'm correct that is) then is chnl5 on the GT5 used for tail gain as normal?
my reason for this is that i've tried adjusting gyro gain in my Tx gyro menu (futaba 10c) & i cannot see any difference with + & - values (for rate & Hhold normally) on the GT5 display or with it's reaction (tail slider going to center in rate & staying put in Hhold)

[Stolla]

There is no tail gain only, only overall gain and it's just useful for setup as you want to run overall at 100 percent anyway

[HeliBenj]

I use it for different gains at different headspeeds too, great results

[seemore74]

There is no tail gain only, only overall gain and it's just useful for setup as you want to run overall at 100 percent anyway


:thinking So how can that be a good thing? especially with the many varying heli mechanics & tail servos out there, surely you will end up with say, the gain value on the tail great but the gain value on the head needing adjusting which if you do you'll now mess up the feel you had on the tail.Man I wish i knew this before i got this unit, oh well i'll continue tweaking to see if i can get it locked in as at the moment the tail seems not solid & crisp & it seems to slightly over shoot on the stop. The same for the cyclic, if you aileron bank it and stop it seems to not stop accurately. Any suggestions guys?

[jockstrap]

There is no tail gain only, only overall gain and it's just useful for setup as you want to run overall at 100 percent anyway

Not true.. there are separate gains for tail and cyclic and an overall gain..

Both the tail and cyclics have their own dedicated PID values you can change and then a "total gain" of 100 reflects 100% of the 2 individual "P" gains.

Changing the "total gain" by a given percentage results in a corresponding percentage change in the "P" value of both the tail and the cyclics.

eg: if P (gain) for tail is 50 and P (gain) for cyclic is 80... if you reduce the "total gain" buy 10% then tail becomes 45 and cyclic becomes 72. Likewise if you increase "total gain" by 10% then tail gain becomes 55 and cyclic gain becomes 88 - 10% change in the separate "P" values..

If you wish to change tail gain and not cyclic, you simply change the "P" value of the tail, and visa-versa - and leave "total gain" untouched.

Hope this helps clear it up... not make it more confusing..

[jockstrap]

:thinking So how can that be a good thing? especially with the many varying heli mechanics & tail servos out there, surely you will end up with say, the gain value on the tail great but the gain value on the head needing adjusting which if you do you'll now mess up the feel you had on the tail.Man I wish i knew this before i got this unit, oh well i'll continue tweaking to see if i can get it locked in as at the moment the tail seems not solid & crisp & it seems to slightly over shoot on the stop. The same for the cyclic, if you aileron bank it and stop it seems to not stop accurately. Any suggestions guys?

I've found the gains on the GT5 need to be a lot higher than you would set on normal gyros..

I would;

1) set total gain to 100%
2) set tail and cyclic "P" values to maybe somewhere in the 80's
3) set the "I" value at least 10% lower for each
4) test fly - lower the corresponding "P" if any oscillations
5) increase or decrease "total gain" 5% at a time and determine the desired effect on just tail or cyclic - but one at a time untill you are a little happier with them - record the "total gain" setting at that time. It may be different when testing tail and cyclic
6) set "total gain" back to 100% and adjust the individual "P" values by the percentage increase/decrease in "total gain" that was needed to make them happy.
7) test fly again - repeat till crisp..

as far as bounce-back and things like that - you'll need to the play with corresponding "I" and "D" values..

I'm no "fine tuning" expert but give that method a try.. can't hurt I guess..

PS: the 5% in step 5 is a guideline - when fine tuning it may be as little as "1%"

[seemore74]

"I see" said the blind man, very good explanation jock :clap that makes things a lot clearer to me now. I guess you could say the developers basically use different terms for the various parameters than i'm used to on a FBL system. I will give the procedure you described above a try when the weather gets better & hopefully i'll get my Srimok flying sweet.
Oh, i don't know if you use a futaba radio but does that mean that adjusting tail P value cannot be controlled by my normal gyro menu in my Tx?