Auto tail trim vs manual tail trim - HeliFreak
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Old 12-05-2017, 07:33 PM   #1 (permalink)
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Default Auto tail trim vs manual tail trim

When I do a trim flight I get values around 10-20 but if I turn off the heading hold and adjust the tail trim with live tuning until it doesn't drift it comes out to around 120. which one should I go with?
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Old 12-06-2017, 01:13 AM   #2 (permalink)
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The tuning tail trim value is based on the normal tail autotrim value.
So itīs the same, if you change the autotrim value or the tuning trim value.
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Old 12-06-2017, 01:20 AM   #3 (permalink)
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Quote:
Originally Posted by DirkS View Post
The tuning tail trim value is based on the normal tail autotrim value.
So itīs the same, if you change the autotrim value or the tuning trim value.
I'm not sure I understand you. When I do it manually (disable I.gain / heading hold and adjust the tail trim until the tail no longer drifts in hover) I end up with a much higher value than when I use the auto trim mode. So it doesn't seem to be the same.
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Old 12-08-2017, 01:34 AM   #4 (permalink)
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The tuning values are in principle translated into autotrim units. So you canīt compare the values directly.
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Old 12-08-2017, 04:46 PM   #5 (permalink)
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Quote:
Originally Posted by DirkS View Post
The tuning values are in principle translated into autotrim units. So you canīt compare the values directly.
So how does does it determine that the value entered into the tail trim field was generated by auto trim and not entered manually? Does it remember this and if you manually touch the tail trim value it will change the scale of the trim value?

Just to be clear, I am talking about the "tail" value here:

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Old 12-10-2017, 03:41 AM   #6 (permalink)
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You mix up two things.
AutoTrim changes the trim values direktly. You will see, that the values have changed after a successful trim flight.
You can also change the sliders for the values by hand. That makes no difference.

Live tuning changes the values indirectly in the background.
You will only see a visible change of the AutoTrim values, if you apply the tuning values to a parset.
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Old 12-10-2017, 04:53 PM   #7 (permalink)
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Quote:
Originally Posted by DirkS View Post
You mix up two things.
AutoTrim changes the trim values direktly. You will see, that the values have changed after a successful trim flight.
You can also change the sliders for the values by hand. That makes no difference.

Live tuning changes the values indirectly in the background.
You will only see a visible change of the AutoTrim values, if you apply the tuning values to a parset.
I think you misunderstood me, what I was saying was that if I disable HH on one parameter set and then use live tuning to adjust the tail trim, and then apply that to a parameter set, It always ends up with much higher values than I get by using auto trim.

Auto trim seems to be giving me very inaccurate trim values, I confirmed that yesterday by disabling HH on an auto trimmed tail trim value on one parameter set and the tail started rotating as soon as I switched to that set. The manually adjusted value needed to prevent rotation of the tail with HH disabled was around 220 where the auto trim value I obtained on three sets (and this was a windless day) ranged between 8 and 130.
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Old 12-12-2017, 01:14 AM   #8 (permalink)
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The AutoTrim tries to minimize the integrator part in a trim flight in combination with the other current active tail settings. You can see that in the flight log.
There can always be little differences in the results. For example if you heli drifts to the left or right even on calm days.

Did you notice any differences in tail flight performance between your manual and the trim flight results? If so, then simply use your manual settings.
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