Quote:
Originally Posted by Mark Sheridan
I love PID controls. Back in college, I had a project where I balanced a vertical bar mounted to a bearing on a swinging arm (like balancing a ruler in the palm of your hand). You could hit that bar all day and it would never fall over.
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Unstable equilibrium. Some high-performance military aircraft today are aerodynamically unstable, and are able to fly only because high-speed computers control the flight surfaces. Computer goes down, aircraft goes down.
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