GT/Geolink V2 Tandem settings / stabilisation issue

[Azetof]

Dear all,

Having finally finished my vario chinook, the first flight was yesterday - after a lot of setting up ( rudder would go crazy the first few flights, 95° turn with 2% rudder stick movement.. Currently flying it with dual rate endpoints for rudder at 40(!)% and nick/roll at 50(!) (nick/roll had the same problem as rudder, far too aggressive) the only way to make it controllable was to turn rudder gain to max (1.5) with 80% gyro gain in the transmitter..
Behavior did not change at all, absolutely no effect from changing any parameter regarding rudder behavior, except the rudder gain.. (servo speed, flight style, complete sensor tab except the rudder gain - absolutely no difference in behavior between minimum and maximum, all parameters tested individually)


What were your tested settings for the tandem function?

Anyway, although the current settings are not quite "elegant" it is controllable and flies kinda as expected from a tandem (can't really be sure, as it is my first Tandem rotor)

But the Geolink v2 still bugs me - position hold works relatively well, but as soon as I activate altitude hold it just flies straight up until I deactivate AH again. Same behavior in stabilisation (scale) mode and coaxial mode - activating AH after setting stabi to coaxial resulted in the same behavior, the tandem flies straight up until features are turned off again. - the extreme dual rate was turned off during the testing of the Geolink Features, so 100/100 submitted on roll/nick/rudder to Fbl - but that made no difference, same behavior with the reduced rates.

Software is 3.4.2, geolink updated to 1.3.1, compass calibrated and correct, 12 satellites acquired, vibration level 23

Spirit gt, geolink v2
Via sbus plugged to futaba R7114SB
Tx: Futaba T18SZ
Hobbywing 200A Platinum V4. 1 HV
4* Savöx SB 2292 SG

Build is mechanically "clean", all servo horns at 90° at 0 pitch, measured with soko helical and an align pitch gauge - all 6 blades after setup under 0.2° variation from each other)
Thanks in advance,

Cheers from Vienna,

Matthias

[ZeXx86]

Hello,

could you send also a photo of your mechanics please? I will check your settings and let you know. It is important to set Pirouette Consistency low, this should improve "Tail" behavior and increase rotation speed.

We are doing improvements for Tandem helicopters gradually, since the support was added recently and there are big differences in mechanics. If we will not find optimal settings for you we can make adjustment specifically for your model and then add it to setup wizard.

I am sure that upcoming firmware will help you a lot with Altitude Hold and possibly all other GeoLink functions. We will be releasing likely on monday.

[Azetof]

Thanks for your fast response!

That sounds great, please let me know if you need any kind of information about the Kit/the mechanic that I can give you. The way it behaves right now I cannot put the fuselage on (too dangerous) but i really really want to fly it with your FBL as i consider it far superior to the BD 3X (the only FBL officially supported by Vario for this model..) Hell, i would even pay you extra to get the Chinook flying as i want it on the spirit. Seriously.. . The Adress given on the shop homepage is about 350km from where I live, so not too far away..

[Azetof]

*2nd post for the rest of the pictures

[Azetof]

*3rd post for the rotorheads manual (front and back are identical, front CCW, back CW) as well as the setup file for the Bavarian Demon 3(s)X, which Vario provides.

here is the link to the manual (1st half fuselage, 2nd half mechanics) - file is too big to upload here

https://www.vario-helicopter.biz/at/d/manual/4800.pdf

Thank you so much in advance!

[urgno]

hello
wow, thats a big mechanic

only one thing in my humble opinion,
the geolink is in a very bad place

under the heli frame the geolink cannot have a clear view of the sky
and maybe also the barometer will get some strange vortex down there
ofc when you will mount the fuselage that will be better
maybe then you could attach the geolink directly to top of fuselage

[Azetof]

hello
wow, thats a big mechanic

only one thing in my humble opinion,
the geolink is in a very bad place

under the heli frame the geolink cannot have a clear view of the sky
and maybe also the barometer will get some strange vortex down there
ofc when you will mount the fuselage that will be better
maybe then you could attach the geolink directly to top of fuselage

Hey, thanks for your input!
The geolink is mounted on the bottom to make use of the Laser sensor, drilled a hole in the fuselage right beneath it. It acquires its 12 satellites in <5 seconds.. I already thought about mounting it on the fuselage, but can't test this in current state as the flight behavior is way too unstable to risk the expensive, >600 working hours fuselage

[urgno]

wow ... lot of time !
maybe you could post a pic of the fuse too for our enjoyment

btw you are right, is not easy to find a place for the geolink in a mechanic so big
and be able to get satellites and laser too

[Azetof]

wow ... lot of time !
maybe you could post a pic of the fuse too for our enjoyment

btw you are right, is not easy to find a place for the geolink in a mechanic so big
and be able to get satellites and laser too

https://flic.kr/s/aHsmWQyTws

Cant wait to test the new Firmware - far too windy here today. And looking forward to Tomas´ answer regarding the tandem flight behavior

[urgno]

https://flic.kr/s/aHsmWQyTws

WOW ! my compliments !