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PostPosted: Mon 17. Aug 2020 10:01:19 
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@TO: what frequency are you running the tail servo at? (max. = 250Hz for SB2272MG following many sources, other saying 333Hz) btw: did you set Tail Revomix?

is it getting very warm? did you do any test on your tail servo? just put a little bit of load on it by holding tail pushrod with 2 fingers (not too tight) and check if it is starting to loose power more than to be expected (it is strong). does it get very warm during the test?

i had this servo in a Logo 690... first it was easy to setup, tail was good to very good. then i noticed it being really hot after flight, next 2-3 flights some tail blowouts i thought i just pushed it too hard, then it failed mid flight. btw: i was @ 333Hz.

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PostPosted: Mon 17. Aug 2020 13:12:23 
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thanks all for all hints, replies inline

> if running the governor, the gain could be too high or too low for response gain.
using castle internal governor "set rpm)

> Your tail thrust bearings could be worn out.
all bearing are new :)

> The tail servo could be going bad.
can be ... will verify

> How much collective pitch are you running?
+-12°

> What is piro consistency set to?
> I would start off around 155 and only turn up main tail gain as much as possible first.
> If it's already low or default then check the things above.[/quote]
is the wizard default for trex 600 - 165

HeliMLM wrote:
@TO: what frequency are you running the tail servo at? (max. = 250Hz for SB2272MG following many sources, other saying 333Hz) btw: did you set Tail Revomix?

is it getting very warm? did you do any test on your tail servo? just put a little bit of load on it by holding tail pushrod with 2 fingers (not too tight) and check if it is starting to loose power more than to be expected (it is strong). does it get very warm during the test?

i had this servo in a Logo 690... first it was easy to setup, tail was good to very good. then i noticed it being really hot after flight, next 2-3 flights some tail blowouts i thought i just pushed it too hard, then it failed mid flight. btw: i was @ 333Hz.


from specifications they say 333Hz
will try at 200Hz ( 250Hz is not available in spirit settings )
https://www.savoxusa.com/products/savsb ... al-details


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PostPosted: Mon 17. Aug 2020 15:05:35 
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urgno wrote:
from specifications they say 333Hz
will try at 200Hz ( 250Hz is not available in spirit settings )
https://www.savoxusa.com/products/savsb ... al-details


i had the specs from https://world-of-heli.de/servos/savox/savox-brushless-hv-heck-servo-sb-2272-mg.html where i bought mine... but this should anyhow not be your problem. just check if they are getting too warm...

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PostPosted: Mon 17. Aug 2020 19:03:39 
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Checkout.....http://manual.spirit-system.com/index.p ... Sav.C3.B6x
Should be good at 333Hz


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PostPosted: Mon 17. Aug 2020 23:33:52 
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yes checked

the fact is that i have to find the right combination of:
- gain
- common gain
- rudder delay
- castle governor gain
and more ...

don’t know how is best to proceed :(


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PostPosted: Tue 18. Aug 2020 7:25:08 
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It's a bit 'newbie' but did you select Trex 600 in the setup wizard? At least you'll have a known working setup to go from.
My next step would be a different servo.


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PostPosted: Tue 18. Aug 2020 9:10:09 
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yes ofc I did use trex600 in wizard :mrgreen:


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PostPosted: Tue 18. Aug 2020 9:22:16 
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Please proceed according our guide:
http://manual.spirit-system.com/index.p ... ning_Guide

You can set Governor Gain before tuning tail so that RPM will hold well enough, but you will not hear any motor jittering.

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PostPosted: Tue 18. Aug 2020 11:00:09 
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will do some test after vacation :-)
thanks to all


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