Which of the following statements about static lateral and directional stability is correct?
The effects of static lateral and static directional stability are completely independent of each other because they take place about different axis.
An aeroplane with an excessive static directional stability in relation to its static lateral stability, will be prone to spiral dive. (spiral instability).
An aeroplane with an excessive static directional stability in relation to its static lateral stability, will be prone to Dutch roll.
Static directional stability can be increased by installing more powerful engines.