Back in 2013 I posted about some real gyros, yaw rate gyro packages from decommisoned DC-10s. How does this relate to time-nuts? Well, take a rate gyro output and integrate over time, you get position. That out of the way... I find rotating mechanical gyros to be fascinating. I came across these again while I was cleaning out my lab. After 50 yrs, the one I hooked up still spins up just fine. I'm impressed. So, why the post? Seems there used to be a gyro-nuts group back then, can't find any evidence of that now. Anyone have any clues? I had made a lot of progress figuring out all the electronics in the package, but now I've lost all that. Bill -- Bill Ezell ---------- I happen to know this is the Lupin Express