Fixed constraints stiffness

[etsach]

Hi! I have a problem with rigid body connected by fixed constraints. It seems the fixed constraints still use finite stiffness for being solvable, which is fine. But in my case it causes the attached object to wobble to death.

I am modelling an aircraft with ordnance attached under the wings, defined as rigid bodies with a constraint. The aircraft has a fly by wire system that stabilizes the flight. It seems the slight "spring" effect of the constraint enters catastrophic resonance with the fly by wire system. So I would need to increase default stiffness and/or damping of the fixed constraint, which is clearly not adapted to the mass & forces order of magnitudes of that project.

How can I achieve this?