411A
Thanks for the correction re series/parallel Y/D. Oops, its been a while....
BIK etc
The glib answer re Saab Y/D off for t/o and ldg is "because the AFM says so". As I understand it, the Y/D is off close to the ground because it inputs rudder in the event of an engine failure - you can see the potential failure modes!!!!
About the B707 rudder feel, on the -300 there was a "Q bellows" in the fin to adjust the feel for airspeed. The -100 was simply a dog's breakfast in the rudder - the JT3C powered series had no power rudder, but with the JT3D fan series, power rudder was a must (12,000lb vs 18,000lb thrust). How this was achieved depended on degrees of rudder displacement and varied from no power to full power. All I can remember was that it was a bloody nightmare to rig. I'm fairly sure that the B707-300 had artificial feel on the rudder. The rest of the system is for another thread I think!! It's been a hell of a long time since I was an airframe LAME on the B707.
