Help! Attaching Stuff To Wings Causes My Planes To Float Vertically!!!

[NeoMorph]

For some reason, sometimes when I attach stuff to wings or attach aerodynamic surfaces to my planes I find it causes them to just float away when I go to launch... Like this...

 

Does anyone have a clue what is causing this... I have a bunch of mods installed and have tried to track it down before now but because it is hit and miss with it happening I can't nail what is causing this.

Edit: Hmmm... Looks like it is FAR causing the problems. Must not like one of my other mods....

Edited June 3, 2016 by NeoMorph

[awang]

TweakScale and FAR don't get along very well.

[NeoMorph]

Ahh... thanks for the info... It's been bugging me for ages. Sometimes it worked... other times it acted like a space anchor and other times like a damned blimp. Was driving me bonkers.

As I use tweakscale to cut down on the number of parts I need I think I use it loads more than FAR affects my play... so FAR goes byebye sadly. But good news seems to be that the flight model seems a lot better than it used to be anyway so that's good.

[Taranis]

The problem is that some wing parts mass goes into the negative when you reduce the size with tweakscale. You can check with the middle mouse button. You can counter that to some degree with that sturdiness slider far adds.