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  1. Robert Scott

    Engine RPM app for Android

    Thanks to all who helped test my Engine RPM app for Android. The testing period is now over and the updated app is now live in the Google Play Store.
  2. Robert Scott

    Engine RPM app for iPhone

    Thanks to all who helped test my Engine RPM app for iOS. The testing period is now over and the updated app is now live in the App Store.
  3. Robert Scott

    Engine RPM app for iPhone

    Either right here through this forum private "Conversations" to me, or to my e-mail of [email protected]
  4. Robert Scott

    Engine RPM app for Android

    Update for 2023: I have developed an update to Engine RPM for Android, and I am looking for volunteers to test the Beta version of the update. The main improvement is the option of a low-pass filter and the "clipping" option for rectifying the high-frequency percussive sound of the engine to...
  5. Robert Scott

    Engine RPM app for iPhone

    Update for 2023: After 3 years I have updated Engine RPM for iPhone again. The main improvement is the option of a low-pass filter and a "clipping" option that rectifies percussive bursts of sound to extract the fundamental sound of the engine. This enables the detection of RPM in cases that...
  6. Robert Scott

    ATC for Crosswinds Marsh

    I took this picture ten years ago this February and I thought you all might enjoy it. Near as I could remember, these geese were on a heading of 260 when I took the picture.
  7. Robert Scott

    Engine RPM app for iPhone

    Hopkins is great, though we went back to snow today. I know Burnsville well, overlooking the beautiful Minnesota River. The Android version worked well. And now I want to bring the iPhone version up to date with the same improvements I developed for Android. I have not updated the iPhone...
  8. Robert Scott

    Engine RPM app for iPhone

    Last fall I posted about the Android app I developed to measure the RPM of an engine from the sound. Thanks again to those of you who volunteered to test it for me. But now I have incorporated the improvements in the signal processing algorithms that I developed for that app into my existing...
  9. Robert Scott

    Engine RPM app for Android

    The production version has the ability to log up to 511 RPM readings and send them to yourself by email. It also freezes the last good display when no RPM can be calculated, instead of reverting to "----". And the Hint Band Adjust display now displays all three of 1. Min RPM, 2. Max RPM, 3...
  10. Robert Scott

    Engine RPM app for Android

    At the end of October in the New Member Introductions ("Retired in MN") I said I was beta testing an app I developed for measuring the RPM of an engine from the sound. Several of you tested the app for me and provided me with some useful feedback. I am happy to report that the app is now in...
  11. Robert Scott

    Retired in Hopkins, MN

    Messages sent to Dana and Deuelly.
  12. Robert Scott

    Retired in Hopkins, MN

    I used to live near Ann Arbor, but we moved to Minnesota 7 years ago. As for the medical, I was not rejected. It was purely my decision. I just didn't feel safe anymore.
  13. Robert Scott

    Retired in Hopkins, MN

    Thanks! I had a lot of fun developing it. Sitting at Ann Arbor airport when there was only one plane doing a run-up at the start of RWY 24, I could measure the mag drop as the pilot checked L, R, and both - from a quarter of a mile away! However once he started his takeoff roll, the Doppler...
  14. Robert Scott

    Retired in Hopkins, MN

    Hello from Hopkins, MN. I am a private pilot who has not flown in 7 years. My interest is in the technology of aviation. I grounded myself for medical reasons, but I remain keenly interested in general aviation. Years ago I designed some aircraft system controls (non-critical) for freight...
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