Hmm - actually any bending could be enough to make the performance bad - even that it is that small friction, it is better if there is no guidance (at least if the push rod is not too soft). So this can be another thing to try.
We have Gaui NX4 here and there was a similar issue.

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Spirit System developer

It doesn't appear like it would cause binding, but I've slid the rod guide back much closer to the tail assembly now and the rod naturally lines up with hold now where it was slightly flexed in its last placement. Hopefully can get out to try tonight if the rain/wind stays away.


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So was able to test the things discussed. Still kicks about 2-3 inches on hard pitch pumps.

Going to remove the pushrod guide altogether today and see if that has any effect. The wire push rod isn't that stiff, so might not be ideal. I've ordered a new Lynx CF rod to try as well.

2500rpm with a tri-head should be plenty of headspeed, but am going to max my HS on this pinion, (2650), and see what that does.

I also increased my tail pitch at neutral rudder, and that may have improved the kick a slight bit.

Revomix of just 1 was not good. It actually made my tail go the opposite way during inverted backward flight as collective was applied.

I'm thinking it has to b mechanical, but am running out of things to try. When the CF pusrod arrives, ill likely try your recommendation of moving one servo hole closer being that I hopefully won't need a guide and the pushrod should be ok on a slight angle from servo to tail assembly.


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Well, got to the field today. It didn't end so well.

I tried removing the pushrod guide, didn't work.

I tried increasing the governor hold setting, didn't work.

I then tried to max out my headspeed to see if the kick went away with more headspeed and it was better but still kicked a bit. I had 2500rpm set as max HS in the Spirit, and I set 2800rpm as I didn't think it could actually get that fast. It was probably running 2750rpm, per the readout on the Jeti during spool up, and I should have landed after I assessed that more headspeed didn't entirely cure it. 2750rpm should be way more than enough HS to get solid tail authority. But I was near the 50% mark of mah used when I made this change. Then decided to "play" with the 2750rpm. Tried some tic tocs and was having fun and then the heli lost power and it came down as it continued to lose headspeed. I was able to autorotate somewhat and save a messy crash, but broke a breakaway servo arm and the swash follower link. No big deal if that's all it is. It's fixed and ready to go again. Hopefully I didn't miss anything in the post crash investigation.

The Spirit log only showed "Low Voltage" event and everything before then was "Good." The lips was sitting at 3.83V/cell afterwards so not sure why I lost voltage. Could it have sagged to the LVC during the tic tocs? I'm confused by this.

Anyway, still no idea how to cure the tail kick. I don't think a CF pushrod will cure it, but moving it in 1 hole on the servo arm and adding a stiffer pushrod is my last hope.

Hi,

thank you for all that info.
Sadly it ended bad, but at least not a big damage.

Regarding the original problem.. When I am reading this:
Revomix of just 1 was not good. It actually made my tail go the opposite way during inverted backward flight as collective was applied.
Then it looks that something must be wrong in the settings, because this should never happen. If you see, that it is even worsened, then the basic settings might be not OK.
First what I recommend to try is:
1. Go to the Diagnostic tab
2. Move with all the sticks to check if all directions are matching. Especially aileron, elevator, pitch, rudder. Can you confirm that when you move with any of the sticks it will move to the same direction on the screen? This is very important.

In any way, Revomix at 1 should be barely noticeable, so maybe it was just concidence. You can try value of 3 to be sure.

Regarding crash, it really looks like a low voltage issue, but not from the main battery, but BEC. To verify that your BEC is sufficient, I highly recommend to perform BEC test that is embedded in our software. It has to pass it with no issue (no low voltage event in the log). Then we will know.

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Spirit System developer

Setup is good in diagnostic tab.

The revo made counteracted the torque too well at 1, or so it seemed. I can try again with a setting of 3 to be sure.

I ran the BEC test twice and no issue either time this morning. It made it all the way through.

I've dropped collective down from 13 to 12 and will see what effect that has today.


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I think I'm on to something. I disabled the Spirit Governor and problem seems gone. Only thing... hard to be 100% sure as there is bogging with no Governor so not an apples to apples comparison. Tail seems rock solid though.

Current Gov settings are response = 7,holding = 6

Moved response up to 9, no difference, revomix to 3, no real help.

I had started at the default settings for both values and climbed from there.

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Great news!

If this is the case, then it mean that the Governor was holding the RPM too well, but the rudder was not able to hold it in the same way.

So what will help is to actually decrease Governor Response, maybe to default value (5). So with smaller values it should be just better as the RPm will be not held so agressively.

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Spirit System developer

Ok. and where should the holding value be set?

I recommend also default value - 4. Then try to increase/decrease the Governor Response.

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