[ODE] Contacts/constraints?

[Colin Reed]

> ODE implicitly uses impulses - it calculates forces that are scaled by
> the timestep value so that they will have a constant effect per
> timestep.

Ok, I noticed some unexpected (read, don't fully understand so seemed
strange) behaviour regarding my springs. If I change the timestep the
the spring rate needs to be changed, bigger timestep = smaller spring
forces. Am I missing something?

Colin