How to have smooth pitch (no wild swinging\jerking during ascent and rolled turns)

[GreatPlainsDrifter]

I'm using B9, FAR, Karbonite mods.

My problem is that my designs don't pitch smoothly, when trying to pull up the aircraft swings wildly and the prograde indicator jerks up and down, when I get close to the planes upper ceiling using using airbreathing engines its tough to keep it angled up (this design uses Sabre S, but I have the same problem with all of my designs). I have this issue using both normal and precise (caps lock) mode. I can use trim (alt+s) but it feels like I am constantly fighting to keep it pointed up. Also continues to be a problem if I have tanks full or running empty.

Any answers to this issue or threads that answer this? I've tried searching the forums but i'm not sure if there is a more common name for this issue.

Edited February 14, 2015 by GreatPlainsDrifter

[Sirrobert]

It doesn't look like your centers of Thrust, lift, and mass are in line. That's fine in atmosphere, where the wings can compensate. But once you leave the range where the wings have effect, the unalligned thrust is going to flip it

Edited February 15, 2015 by Sirrobert

[GreatPlainsDrifter]

It doesn't look like your centers of Thrust, lift, and mass are in line. That's fine in atmosphere, where the wings can compensate. But once you leave the range where the wings have effect, the unalligned thrust is going to flip it

Yes, once it's out of the atmosphere I kill everything except for the 4 at the back, it does ok in orbit.

My concern is bobbing\pitching in the atmosphere, especially at altitudes below 20K.

[LethalDose]

At a glance, I'd recommend moving CoL and CoM closer together.

Also, Pre-0.25 I had luck with increasing the amount of SAS torque on the vessel to maintain attitude. It's a bit of a "brute force" solution, but it works. At least it used to, I simply haven't played enough past 0.25 to state for sure if this is still a functional solultion.

[DeMatt]

Use a (analog) joystick instead of the (digital) keyboard. Then you can fine-tune how much you're steering without resorting to using trim to steer.

I don't know if FAR has input-dampening assistance, but you could poke through its settings.

[Sampa]

Sir...sas is your friend...

[worir4]

I think your wings are too long. Try attaching the front section of the wings directly onto the back wings. Also you may have too many control surfaces. Try removing some and see if it has any effect.

[cantab]

Your horizontal stabiliser looks very small compared to your wings. See what the FAR stability derivatives say at various flight conditions, I wouldn't be surprised if you have some red numbers in the longitudinal section.

[pincushionman]

…joystick…

This. All that other stuff helps tremendously, but a variable-magnitude control input should be a requirement.

You wouldn't drive a car with anything other than a steering wheel and continuous pedals, would you?

[Wercho]

I would turn on FAR's control dampening. While in flight, open the FAR menu and click 'DCA'. You may need to fiddle with the settings for your particular plane, but it will help.

[panzer1b]

from my experience bobbing occurs when i make craft that have large wings which are towards the rear of teh craft. Now idea why, perhaps the SAS overcompensates or whatnot, but it seems a common occurence with larger craft.