tarot xyz and flybarless 600

[roger]

hi all, i've been flying helis for years decided to go flybarless. 600 flybarless head and tarot xyz. all seems ok on ground but when i get near take off speed the swash keeps going hard right. if i manage to get past this and hover (really hard) seconds into the hover the heli goes into a frantic woble. any ideas? i seem to have tried eveything and the head etc looks perfect.

[Mikej]

hi all, i've been flying helis for years decided to go flybarless. 600 flybarless head and tarot xyz. all seems ok on ground but when i get near take off speed the swash keeps going hard right. if i manage to get past this and hover (really hard) seconds into the hover the heli goes into a frantic woble. any ideas? i seem to have tried eveything and the head etc looks perfect.

Roger,

Hard aileron movements are usually caused by vibes - how smooth is it? How good is the tracking? Oh and how is it mounted ? they prefer to be pretty firmly mounted.

What firmware in the ZYX - the latest 3.5 is much better IMHO, but you need to drop teh D values on the swash to 10. Can you post your .ini file to see if there is anything obvious.

Cheers,
Mike

[roger]

hey mike thanks for quick reply. .ini files? not sure what these are, are they in the unit? tracking seems good and the unit is mounted on a plate at the front of the heli like a small battery tray. all on a trex 600

[Mikej]

The .ini file is the file created when you save the settings using the PC software - it lists all of your settings and is on your PC (assuming you have used the softwre to set the unit up)

[davew]

Hi Roger.
I fly a 600 nitro using a Tarot zyx and am very pleased with it. Is yours a nitro?
When I first tried mine - using the settings that work nicely on my 450 - it frightened me to death - shake isn't the word!
I had to dial the settings right down on the advanced screen and also strap the FBL unit down very hard. Its mounted on a gyro pad and then pulled down hard with a cable tie through fuel tubing.
I can let you know what my PID settings are if it helps.
BTW, Mikej is the man in the UK for ZYX advice so keep sweet talking him

[debrooker]

On my GAUI using the recommended servo ball positions I was getting the same, I ended up moving the servo ball positions in.

[davew]

On my GAUI using the recommended servo ball positions I was getting the same, I ended up moving the servo ball positions in.

From what he describes I doubt it's tail shakes that are the problem, it'll be whole body shake! Needs to drop the Roll&Pitch P value down to about 30 from the 80 where it probably is now.

[Mikej]

From what he describes I doubt it's tail shakes that are the problem, it'll be whole body shake! Needs to drop the Roll&Pitch P value down to about 30 from the 80 where it probably is now.

Dave,

Are you sure about those figures? Keeping the P value closer to 80 and dropping the Gyro Total Gain for Roll and Pitch down to 30ish is more common.

Cheers,
Mike.

[debrooker]

From what he describes I doubt it's tail shakes that are the problem, it'll be whole body shake! Needs to drop the Roll&Pitch P value down to about 30 from the 80 where it probably is now.

sorry should have been clearer, i was referring to the cyclic servo ball positions. At the recommended distances I found that the available throw was enormous, so I reduced by moving balls in.

[davew]

sorry should have been clearer, i was referring to the cyclic servo ball positions. At the recommended distances I found that the available throw was enormous, so I reduced by moving balls in.

Using the servo wheels on the Align DS610 servos you are stuck really with the ball position, ie servo arm radius. It could certainly manage with a smaller redius. On my 450 I dropped the servo arm radius down from 13mm to 10mm and definitely benefitted.

[davew]

Dave,

Are you sure about those figures? Keeping the P value closer to 80 and dropping the Gyro Total Gain for Roll and Pitch down to 30ish is more common.

Cheers,
Mike.

Hi Mike,

On the 600 nitro I have the Pitch and Roll Gyro gain on the front page at 30
On the advanced settings for Main Rotor my P.I.D settings are 30 75 30

The reduction to 30 P value was what got rid of the body shakes. Picked it up from postings on Helifreak where zyx use in the USA is more common on nitros. dave

[Mikej]

Hi Mike,

On the 600 nitro I have the Pitch and Roll Gyro gain on the front page at 30
On the advanced settings for Main Rotor my P.I.D settings are 30 75 30

The reduction to 30 P value was what got rid of the body shakes. Picked it up from postings on Helifreak where zyx use in the USA is more common on nitros. dave

That's interesting Dave, thanks for explaining.