Spirit System

Upgraded to the 4.0 software on the Spirit GT last week and I'm not happy with the rudder behavior.
Flying ilGoblin Pro with Theta T1 tail servo.
First of all the tail servo exhibits jerky movement and a crunchy sound on the bench which is somewhat dependant on the tail stop setting (default 5/6), but even at the lowest value of 3 it doesn't go away. Tail pushrod moves in a very jittery way.
This behavior also manifests in the air in multiple ways:
-Tail oscillates in pitch pumps even when lowering the tail gain to much lower than it used to run. I also had to lower piro consistency a lot from the ilGoblin preset value of 190 because this caused a constant small and fast vibration in the tail even in a hover. The lower gain results in reduced tail hold but I had no other choice.
-With small steering inputs the helicopter doesn't rotate smoothly. You can clearly see the jerkiness when accelerating slowly.
-In fast clockwise piro it's also way too jumpy with corrections which causes the pushrod to rattle.

On the plus side the tail stops are undoubtedly much sharper with the new software but due to this behavior I decided to downgrade to 3.7.2 and it performs as expected again.

Hello,

all these problems could be because of too high Rudder Delay. Unlike previous versions you need to set it at 0 - 2 in the most cases. Higher values can cause issues like you described. Pirouette Consistency works exactly as before so value can remain (after re-adjusting Rudder Delay).

Hello Tomas,
if something changes in the new firmware for example some values are not more relaible then you should give us some hints what we have to change when we come from a firmware before - I don't want to get surprised by an uncommon behavior that could end in a crash -
If necessary I would in your place remove completely parameter that aren't anymore necessary or limit the parameters so that such an unexpected bahavior can not occure -
Please also keep in mind that even beginners use this fbl and usually lack the sensitivity to control or are quickly overwhelmed by the ability to react correctly. This does not exclude the possibility that experienced pilots may also be surprised or overwhelmed by the suddenly different behavior.

The optimization tips for cyclic settings and the tail settings have not been updated or adapted to the firmware yet.
I think here must be done some optimations before crashes ends in frustrating in this fbl -

Best regards
Matthias

Hello,

thank you for your message. We are trying to inform users in the ChangeLog when each new version is released. For version 4.0.0 we wrote all related changes there, including Rudder Delay.

Hello Tomas,
thanks for your reply !
I have to admit I overlooked that! Wouldn't it be better to mark all changed requirements in red, like was done with the rotation rates? That's probably why I didn't consider it that relevant...
One suggestion would be a list of warnings in red, indicating which values need to be changed, followed, as usual, by an explanation of what has been implemented in the new firmware. You'd have all the absolutely necessary changes at a glance. What do you think?

Best regards
Matthias
My sugesstion for short changelist:

Thank you, we will add warnings like this to the current changelog to help other pilots.

Tomas thank you for your reply !
I would set this warnings at the beginning of the description because of relevance -
I have found an post where you do an remark of the deadband - has this also to be changed before flight or was this only in conjunction with this special case of the user ?
If not this has to be also listed in the list of necessary changes before first flight

Best regards
Matthias

Here the hardcopy out of another thread:

Hello,
I was already using rudder delay 0, and I also tried values 2 and 5 to see if it made any difference but it did not.

I also noticed collective wasn't moving smoothly either but it wasn't noticeable in flight, could this issue be related? I'm also using an FBUS receiver (FrSky TW R6), using 11 channels though.
viewtopic.php?t=6517

It works without problems on 3.7.2 but I have multiple helicopters on Spirit and the settings software isn't backward compatible so I'd like to be able to upgrade this one.

Hello E.S.H !
I think there is maybe a problem but on which side is hard to say -
I hope Tomas is willing to double-check this to rule out an error on Spirit's side or to fix a possible bug in the FBus decoding implementation.
I hope we will see a fix.

Best regards
Matthias