Trex 450 pro DFC - bad midstick vibration.

[Toucan]

Hi all,

Very new to flybarless systems so I'm hoping someone can help me.

I have just set up - as per the manual - the Beast X V3 on my Trex 450 pro DFC.

Took it out for a flight yesterday and noticed a really bad tail wag around mid-stick. At this point I realised I had 100% gain as denoted by the LED on the unit showing at posistion 'N', a noobie mistake. I presumed this was the issue as the manual calls for a maximum of gain setting 'G', so I lowered my gain to the following on my DX8:

Gain TX settings:

Pos 0 -20%
Pos1 - 22.5%
Pos2 - 24%

Throttle curve setting:

Normal:
Low - 0%
25% - 25%
50% - 50%
75% - 75%
High - 100%

Idle Up 1:

Flat 75%

Idle Up 2:

Flat 100%

These gain settings show as position 'C' for POS 0, and position 'D' at POS 1/2 on the Beast X unit. I am also using a 'Normal' linear throttle curve as shown above. I haven't got into Idle1 or 2 yet

When I run the heli up without the main blades on I can see - and feel when holding the boom - a fair amount of vibration at mid-stick. Below mid-stick its fine and above mid-stick its fine. The servos twitch - as I guess the Beast X is conpensating for the vibraion at mid-stick - and the swashplate goes over to the extreme right. It dosen't seems to matter what gain settings I use this stays the same.

I'm using all the stock Align parts (dampers etc). The main shaft seems to be running true along with the tail shaft. The blades seem to be tracking well when checking yesterday.

Any thoughts you fellas may have would be great!

[GIXERMAN]

hi im presuming you have set beasts to tx control for gyro gain, i always have started at 40% gain then work from there. what tx are you using, and are you using standard foam pad as supplied if so remove and use a 3m one.

[Toucan]

Thanks for the reply Gixerman,

I am using a Spektrum DX8.

I can change the Beast X gain settings from my TX yes. I can see if I alter the gain values then the corresponding lights on the unit change. I'm using a 3M pad over the stock align one.

[GIXERMAN]

Thanks for the reply Gixerman,

I am using a Spektrum DX8.

I can change the Beast X gain settings from my TX yes. I can see if I alter the gain values then the corresponding lights on the unit change. I'm using a 3M pad over the stock align one.

Kool ok, also where have you got the ball on tail servo set.

[Toucan]

Kool ok, also where have you got the ball on tail servo set.

I have the ball on the second hole out from the middle of the horn.

I just re-tried it again with the main blades and tail rotor off with a gain values between 30% and 17% and it seemed a bit better.

As soon as it hits the mid stick though that vibration kicks in.