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 Post subject: T-REX 500 tail panning
PostPosted: Sun 21. Feb 2021 22:09:12 
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Posts: 8
Hi,

I have a very annoying problem with my T-Rex 500 pro DFC and Spirit II
Originally I flew with the original Align ESC in "non-governor" mode, meaning with a throttle curve. Sorry, I don't know the exact term in English.
This worked well so far, except from some speed drops.

I then bought a Hobbywing Platinum V4 80A ESC, which should allow me to fly in governor mode.

My current problem is that the tail is panning to the right while I am pitching, even with smooth pitch inputs. It usually wipes back to the original position, once I release the pitch.
I followed the tuning guide http://manual.spirit-system.com/index.p ... ning_Guide, but there was no improvement at all. The only thing that mitigated the issue at least a little was playing with the multiplier of the sensor gain until the tail became unstable.

- My tail servo is a Align DS535M
- I basically followed the wizard for my Align 500
- I use the latest firmware on my Spirit II
- I have experimented with the setting from the tuning guide
- My headspeed is around 1850 rpm
- My Spirit II settings are attached

My questions:
- Whenever I change a parameter in the Jeti setting for the Spirit II, will this be effective immediately without saving or disconnecting the battery?
- Is there anything else I could try to stabilize the tail while pitching?

Many thanks for your support in advance

Best regards,
Daniel


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TREX500DFCPRO_Hobbywing_0.4ds [255 Bytes]
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PostPosted: Thu 04. Mar 2021 14:42:19 
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Hello,

the problem you have could be caused by too low Advanced/Pirouette Consistency value. I recommend to increase it to 165 at least, but you can try also 170.

Then you can decrease Rudder Delay to value 2-4. This will also help.

After these settings, please increase Gyro Gain as high as possible, until you will observe any oscillations in fast forward flight or more demanding maneuvers.

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PostPosted: Fri 12. Mar 2021 17:58:47 
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Joined: Thu 05. Oct 2017 20:06:35
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Did this work for you? I have the 500x with the same issue.

It's currently a 're-kit', so I can't try this fix...


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PostPosted: Fri 12. Mar 2021 18:45:12 
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Joined: Thu 16. Apr 2020 21:18:13
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Sorry guys for not replying earlier. I did not fly the last two, three weeks.

Basically I had to increase the head speed from 1850rpm to around 2250rpm. Apparently the T-REX does not like a too decent headspeed.
In addition to ZeXx86 recommendation I was playing with the Revo Mix, even though when not really recommended.

My tail is now pretty stable - not 100% - but for me it is "good enough" as I do not perform hard flying maneuvers.

Cheers,
Daniel


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PostPosted: Wed 17. Mar 2021 19:42:12 
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murx wrote:
Sorry guys for not replying earlier. I did not fly the last two, three weeks.

Basically I had to increase the head speed from 1850rpm to around 2250rpm. Apparently the T-REX does not like a too decent headspeed.
In addition to ZeXx86 recommendation I was playing with the Revo Mix, even though when not really recommended.

My tail is now pretty stable - not 100% - but for me it is "good enough" as I do not perform hard flying maneuvers.

Cheers,
Daniel


Are you able to post your final settings, please?


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PostPosted: Thu 18. Mar 2021 9:10:46 
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Joined: Thu 16. Apr 2020 21:18:13
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Yes, I can do the next days


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PostPosted: Fri 19. Mar 2021 19:26:09 
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Joined: Thu 16. Apr 2020 21:18:13
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Here you are....
It's just my idle1 profile. I do not really fly 3D.


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PostPosted: Fri 19. Mar 2021 19:50:51 
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Joined: Thu 05. Oct 2017 20:06:35
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Thanks.

I cant look at it in the 4ds viewer, so i'll upload it on a spirit later.

http://4dsviewer.spirit-system.com/
"Unsupported version: heli-3.2.2"


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PostPosted: Fri 19. Mar 2021 19:54:28 
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Joined: Sun 09. Jun 2013 13:14:17
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Location: Plzeň
Open it in demo mode Spirit settings SW 3.2.2
-

jjuk wrote:
Thanks.

I cant look at it in the 4ds viewer, so i'll upload it on a spirit later.

http://4dsviewer.spirit-system.com/
"Unsupported version: heli-3.2.2"

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