>> Excessive static stability results in two things:
>> 1) a greater tendency to weathercock (point into the wind)
>> 2) decreased dynamic stability (tendency to wobble)
Stine's Handbook covers this in some detail (chapter 9). There seems to be two
dynamic stability issues with overstability.
The first is coning that occurs when the CG is way forward and the source of
thrust -- which is to say, the motor -- is a long way behind it. This would be
a result of achieving stability with an absurd amount of nose weight. That
would mostly be an issue with scale models.
The second is "overdamping" when the fins are so large that the rocket's
direction of travel is changed by their lift before they rotate it to straight
ahead. Such a rocket flies nose-first, but not always in a straight line; it
makes the flight look more like one with neutral stability.
In practice, neither of these things happens often, and probably won't happen
if a reasonable combination of fins and weight distribution is used. Most
rockets fly just fine when overstable, IMHO, assuming they get off the pad and
up to speed before the wind turns them over.
Peter W. Clay NAR 18619 SR L1
"What is a tree, but a nut that wouldn't listen to the pessimists?"