There are some great papers about the X-29 control system and its design (eg https://apps.dtic.mil/sti/tr/pdf/ADA151828.pdf), but I’m having a hard time tracking down what control laws it used in the ground, how it sensed transition, and how the control laws blended on takeoff and landing.
For an unstable aircraft like the X-29 (-35% SM), direct law is unsuitable immediately after takeoff due to instability, but I suspect the flight control laws are unsuitable on the ground due to high pitch gains giving stop-to-stop oscillations when the output variables are constrained. Curious how they solved this.
Anyone’s search skills up for the challenge?
For an unstable aircraft like the X-29 (-35% SM), direct law is unsuitable immediately after takeoff due to instability, but I suspect the flight control laws are unsuitable on the ground due to high pitch gains giving stop-to-stop oscillations when the output variables are constrained. Curious how they solved this.
Anyone’s search skills up for the challenge?
