Slip vs Spiral Instablilty
Hi all, I am now studying the content of flight profile and i find that it is confusing about the adverse effect during rolling.
When an aircraft rolls to left, the left wing goes down and the right one goes up. At the same time, the induced drag at right hand side is greater than that at left hand side. This causes the adverse ailerons yaw and the aircraft is said to be slip~~ This effect could be eliminated by applying appropriate left rudder power. And i understand it.
In case of spiral instability, the aircraft banks to left and same effects are generated as mentioned. However, the centrifugal force will cause the relative air flow towards the fuselage of the aircraft. Without the pilot input and the large fin (high directional stability), the aircraft pitches downward and the turning effect is worsen as outer airflow moves faster than the inner one. Result in spiral dive.
So, I would like to ask and seek your advice on:
Will spiral dive only occur in aircraft with large fin (high directional stability) and no pilot inputs ,otherwise, Dutch roll?
Hitman