Originally Posted by
Jan Olieslagers
Hoping I am not causing confusion: is there a parallel with taildraggers risking groundlooping, because their CG is behind the main wheels?
Nobody seems to have answered you.
Yes, groundlooping arises due to instability because the centre of mass is behind the lateral forces when the plane veers every so slightly off line.
It's a bit like balancing a pencil on it's tip, or a cricket bat on it's handle on your outstretched palm. (Do Americans do that with a baseball bat?)
As long as everything is perfectly in line, it's stable, but nothing in the real world is ever perfect, and as soon as it deviates, even slightly, it is unstable and gets worse.
It's also the reason trailers need their centre of mass forward of the axle(s) for stability, resulting in downforce at the coupling.