Scale flying with warbirds

[yamahafunkplayer]

Originally Posted by xmech2k

I beg to differ. While I haven't (yet!) researched the details, as I understand it, the 737 is one of the few swept wing airliners that is not required to have a yaw damper system, as it self dampens dutch roll....

I don't believe the 737 doesn't need rudder input to stay in coordinated flight....Maybe that's just for turbulence induced forces, but probably to keep apparent gravity going the right way in turns as well.

This is fun! I love talking airplanes!

I'm no expert on the 737. But I got my info from this article, written by a 737 captain. http://usatoday30.usatoday.com/trave...nd-flaps_N.htm

I would imagine that the yaw damper does provide some rudder input when turning the airplane. But as I stated in my earlier post, the design of the wing and flight controls (e.g. using flight spoilers to roll the aircraft) can elminate the adverse yaw tendency to the extent that rudder is not needed for a coordinated turn.

[yamahafunkplayer]

Originally Posted by xmech2k

Also, since I'm already on a 'technicality' roll ( Sorry!) , Adverse yaw is not the tendency of a plane to slip through a turn without rudder input. Adverse yaw is when you the ailerons cause the plane to yaw in the opposite direction of the desired turn when the ailerons are applied. In a steady turn, the ailerons should be neutral in most planes, so there shouldn't be adverse yaw at that point. (Many of my models are crooked already... )

You are right. However, my earlier post was refering to the rudder input needed when starting the turn to counteract the adverse yaw caused by the aileron deflection. After applying the ailerons and rudder to enter the turn, both controls are neutralized, and elevator back pressure comes into play to maintain pitch attitude. (this could be a climbing, descending, or level turn)

And you are right, ailerons will be (mostly) neutral during a turn. But as you add more and more elevator back pressure, the airplane will tend to shallow its bank or steepen it. (Depends on the wing design) So some aileron is required, as I said, "to maintain the bank angle".

For anyone who wants the real deal on the subject, here's a link:
http://en.wikipedia.org/wiki/Adverse_yaw