Tinstaafl---
Seems correct to me. Boeing increased the height of the tail on later models of the 707 to help with this problem. Also, a series yaw damper was fitted, better still.
DLC on the TriStar has worked well for many years with few failures and aided in certification for CAT III. Interesting to note that some pilots prefer to switch off DLC so they can land the aircraft like a Boeing. Watched one Captain do this on an FAA check ride, only to be failed. The inspector mentioned that aircraft systems should be switched off only in the event of malfunction, and according to check list procedures.
He was quite right IMHO.
[ 12 July 2001: Message edited by: 411A ]