Originally Posted by
one dot right
What did Rainboe say that was so incorrect? Seemed like a perfectly reasonable course of action.
Rainboe said:
Because of the crosswind element, as the aeroplane lifts off, it becomes in a slight yaw situation as the relative direction of the wind is not aligned with the runway direction, which is what the aeroplane is pointing in.
How did Rainboe manage to track the runway centreline up to the point of rotation? Why is the aeroplane pointing in the direction of the runway and not the direction of the relative wind? Was it not with rudder opposing the:
aeroplane naturally turning slightly into wind by itself
?
If you have a crosswind from the right, you will have left rudder opposing the "aeroplane turning into wind by itself". You have right aileron to counter the right wing producing more lift than the left wing. You maintain this cross control during the rotation. You do not just suddenly abandon the rudder!
Once airbourne you still have these crossed controls. The aircraft will still be heading in the direction of the runway centreline, while sideslipping to the right (into wind). This sideslip will equal the crosswind and the two cancel out. The aircraft is therefore tracking the runway centreline.
Now at this point all you need to do now is slowly relieve the pressure on the rudder pedals until they have naturally come back to the centre. When you say:
I don't think you should use rudder- you are causing another yaw situation, and when you remove the rudder input, you are creating a reverse yaw situation in the other direction.
it seems to me you might be unclear as to where the rudders are at this point in time. I might be wrong but it seems you are visualising the pilot [b[initiating[/b] rudder input at this time to cause the heading to change. This is not the case. At this point in time the rudder input is already there and is in fact now being reduced back to centre.
While the rudder displacement is reduced, the ailerons are reduced too. While this happens, the aircraft has a natural tendency to turn ever so slightly and assume the correct heading to continue tracking the runway centreline. You initiate the movement of the rudder first and then the ailerons in response to the reduction in induced roll. In other words you consciously move the rudder in a deliberate and controlled manner, and move the ailerons with whatever response is required to keep the wings level.
At this point in time, the wings are now level, all the controls are centred, and the correct heading is established which causes the aircraft to continue to track the runway centreline.
I hope what I have written is clear. Being able to demonstrate it in the real world would be so much easier!