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I'd encourage you to ask your mentor about the rudders....I just don't think the DC-9 will allow you use the rudders like that. Most airplanes with yam dampers will FIGHT you (some harder then others) if attempt to make any kind of turn with the rudders.
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Well, I just asked him, he's sitting here next to me while I write this (he's my father, btw), and he said yes he did use rudders in the -9. The yaw dampener just automatically cancelled out any tendancy for the aircraft to dutch roll -- it would not block the rudder out completely. And again this is for very small one, or two degree maximum, heading changes. Not full out turns. And in a jet it doesn't take much coming, down the ILS at 135mph (120kts) to effect a change in heading thus there's not much in the way of noticble yaw. His actual words "it just takes too long to roll that big old wing (the -9 has a wingspan of 109'+/-)."