Using a Hot Wheels Radar Gun to Measure the Speed of Quadcopters?

What’s the easiest, cheapest and still reasonably reliable way to measure the speed of a toy quadcopter or hexacopter? Let’s evaluate a decidedly lo-fi approach in this one-off departure from the regular RCview programming!

Sounds used:
“Doppler siren””
https://www.freesound.org/people/jobro/sounds/31920/

“Woosh Sound”
http://soundbible.com/2068-Woosh.html

Videos shown:
“How to Get Speed and Altitude for a Drone with No Telemetry”
https://www.youtube.com/watch?v=jbFerqtyS5s

“SpeedClock”
https://www.youtube.com/watch?v=kfUAIbqQtbE

“Speed Gun v1.4 (Smart Tools)”
https://www.youtube.com/watch?v=3CmCni_wteg

“#38: Analyze Hot Wheel Radar gun with a Real Time Spectrum Analyzer”
https://www.youtube.com/watch?v=e4UWqrCwCC0

“Aerial Drone Radar Gun”
https://www.youtube.com/watch?v=m_Dvn2RT0Fk

    1. Enfeeble
    2. Shad8x
    3. Diet Bruboy
    4. Michael Thompson
    5. Quad Marley
    6. QUIT.
    7. Jerome simington
    8. twrecks116
    9. Quad flying Mav
    10. Arsi Pilot

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