...can also have some very interesting effects! The NF-104 was a classic example of unpredicted behaviour.
NF104 | Theory to Reality
Up to that point the AST was a typical airplane with static and dynamic stability and a normal proportional rate control system. From there on it became a space vehicle with zero stability and a fixed thrust angular-acceleration control system. In fact, it proved to become somewhat unstable due to cross-coupling of yaw and pitch from the gyroscopic effects of the rapidly rotating jet engine, long after the jet engine was shut down. This had not been predicted.