wip Uncontrolled Input in Pitch

[Ben149]

Trimmed my heli out for a nice and level flight, it suddenly pitches down or up, seems random and makes the heli almost uncontrollable. In the track files I let it play out a bit to have it overexaggerated to show it.
Uncontrolled input.trk

[Yurgon]

This has been an issue from day 1 on.

However, purely from feel I'd say it's actually been tackled with one of the previous patches, at least to a certain extent. The Chinook used to nose dive or nose climb from straight and level for absolutely no apparent reason.

What I see in your track is the helicopter either accelerating or decelerating, and changing its pitch. I'm about as far from an expert on tandem rotor physics as it gets, but my understanding thus far is that because of the tilt difference between the fore and aft rotor heads, it's actually correct that pitch will change with airspeed, in turn requiring pilots to adjust cyclic pitch (pull for acceleration, push for deceleration, IIRC).

And now I'm venturing into an almost undiscovered country: if I understand correctly, there's a thing called longitudinal cyclic trim (LCT) which will take care of this pitch change and make sure that pilots won't have to pull/push cyclic manually when they go through a certain speed regime.

And, you've probably guessed it: LCT is not yet implemented.

With a couple hours under my belt, I do find it fairly straightforward to anticipate the pitch change that'll happen somewhere between 80ish to maybe 120ish knots airspeed or so, and adjust cyclic pitch (and trim) accordingly.

Long story short and tl;dr: WIP

[Ben149]

Thanks for the detailed explanation, and I if it has been dealt with in one of the recent patches, how come the patchnotes were nothing saying about it?

[Yurgon]

Like I said, it's kind of a gut feeling. I don't have the first version of the Chinook available and can't cross check. Maybe my muscle memory has just caught up?

It used to feel like a sudden, random, uncommanded pitch change that required immediate and heavy counter-cyclic. Now I'm seeing a gradual pitch change that can be countered with fairly moderate cyclic. Maybe it's just a placebo and the flight model is still the same, I can't say for sure.

[Lord Vader]

Hey @Ben149

The current AFCS, trimming and flight model should be considered "work in progress" as the team is fine tuning the general performance and flight behaviour.

The model is already quite stable but we are still working on it to make it even better. 

Thanks for your cooperation.