Phantom yaw

[volcanicshrimp]

When this plane reaches about 100-150 m/s, it starts yawing to the left or right for no apparent reason. The plane is all stock parts placed using mirror symmetry and doesn't have any weird control surface alignment that I know of. The only non-symmetrical thing is the ladder!

KSP AVC Mod list:

KSP: 1.0.2 (Win32) - Unity: 4.6.4f1 - OS: Windows 7 Service Pack 1 (6.1.7601) 64bit

USI Tools - 0.4.1

Chatterer - 0.9.1.86

Editor Extensions - 2.7

Firespitter - 7.1.3

Flight Manager for Reusable Stages [FMRS] - 1.0

RasterPropMonitor - 0.19.3

kOS - 0.17.2

KSP-AVC Plugin - 1.1.5

Infernal Robots - 0.21.2

Final Frontier - 0.8.2.1285

Pilot Assistant - 1.9.3

QuickExit - 1.3

QuickMute - 1.0.4

QuickSearch - 1.1.2

RCS Sounds - 4.3

RealChute - 1.3.2.3

SCANsat - 1.1.2

ShipManifest - 4.2.1.1

SmartStage - 2.6.1

TextureReplacer - 2.4.4

ThrottleControlledAvionics - 2.2.1

TweakScale - 2.1

USI Alcubierre Drive - 0.2.1

[ExplorerKlatt]

Could you post a craft file? I would like to try it and see if I can find where it is coming from.

[volcanicshrimp]

how? I am noob

[Feradose]

You could try moving the tail fins further back for more stability, it seems its yaw unstable

^ nevermind that, I just noticed the staging, well, a bigger fin on the back?

Edited May 21, 2015 by Feradose
noticed the decoupler

[BudgetHedgehog]

You've got basically no vertical stability on the craft at all. Move the tailfin backward, it might need to be bigger too. Yes, that means it'll be on the stage you decouple. No way around that.

[ExplorerKlatt]

how? I am noob

Use a site like dropbox, then post a link here.

[Feradose]

You've got basically no vertical stability on the craft at all. Move the tailfin backward, it might need to be bigger too. Yes, that means it'll be on the stage you decouple. No way around that.

Wouldnt keeping the tailfin there and adding a bigger one at the back help then?

[volcanicshrimp]

shouldn't this just make it hard to control rather than making it yaw?

[volcanicshrimp]

How do I edit a thread? I can't work out how to move this thread to the unmodded installs support forum or change my roll bug thread to solved.

sorry about having 2 posts with questions in a row.