Originally Posted by
Beech19
Hi guys
I've also got an SFO interview coming up. I've been going through 'Ace the technical pilot interview' , but some of the answers don't match up to some of my other books. Have any of you had any similar problems?
The discription of dutch roll says that "...the outer, upward wing stalls and loses all lift..." isn't it the fin that causes the oscillation?
Another is the question "how does VMCA/G vary with C.G. position" is VMCG not based on the rudder and main gear? or is it affected by C.G. the same wat VMCA is.
Would appreciate a bit of light.... Cheers
ACE has many, many errors in it and not just the harder to understand questions, real simple ones are in error.
The dutch roll is initially started by the action of a yawing moment. This causes the outboard wing in the yaw to travel outwards changinging it's angle of attack and "projected" length to the airflow. This causes it to create more lift starting a rolling movement and so the cycle begins. Thats why you stop the roll with ailerons and not the rudder.