Pywackit> Theoretically, I can't tell you what makes your plane pitch down when you apply rudder unless I personally fly and look at your plane. But I do have an answer of your second problem, which is "the cross wind landing" as you mentioned. A lot of folks give you some information on how and when to apply rudder while flying. At this point, I am sure you're quite confused. Let's make it simple!! I make it easier for you to understand.


You apply rudder :


A- When you counteract the torque effect of the engine on take off. (In such a case, you apply right rudder to compensate the torque effect that pulls the aircraft to the left)



B- When you land crosswind. (Let's say the wind is coming from your left, which is 90 deg to the runway and you are on final approach. First, crab or tilt the airplane into the left by applying left aileron. Then, you apply right rudder to straighten the nose out as soon as the main wheels touch the runway.



C- To prevent the plane from slipping or skidding when you bank the wing to the left or to the right. (When we say "skidding", we mean the plane is turning too fast for the degree of bank. Then, we have to relieve rudder pressure to decrease the turn rate. On the other hand, when we say "slipping", we mean the plane is not turning fast enough for the degree of bank. Then, we have to apply more rudder pressure to increase the turn rate. This is the principle of the coordinated turn.)


You don't have to understand part C unless you want to learn to fly a full scale. However, mastering both part A and B is very crucial when you fly model planes