I flew a Baron 50 gasser and a smaller Cricket gasser. After building my Baron 50, I remember a company (can't remember which one) releasing this new invention called a "gyro sensor." This was the precursor to today's IMU's and Flight Controllers with a myriad of built-in sensors. That thing was a beast to fly. I never did master it. What I wouldn't give to go back in time and fly that beast now. My skill levels are orders of magnitude better than when I was in my 20s.
Here's a photo of one I grabbed off the Internet. I have actual hard copy photos of my Baron 50 that I would have to scan.
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I remember the "OMG!" feeling I got the first time I was able to actually let go of the joysticks on my Phantom 1. I couldn't believe that I could actually just set down the controller and the bird would stay in place. Amazing!
D