1st results from the flywheel dynamometer project

Just completed a first prototype of the flywheel dynamometer. It currently measures RPM, from which angular acceleration, torque and power can be extracted. The plan is to measure voltage/current at the battery to determine motor efficiency. I'll release its Arduino source code and post-processing Octave/Python scripts shortly.

I'm concerned that the motor mechanical power maxed out at ~50W. It drew ~100W max with a fan on. It's rated for 500W. What gives... I'm looking forward to measuring input power.

It's a 3800 KV motor, so on a 3 cell Lipo (11.1V) I should be getting 40,000 RPM out of this motor at no load. It maxes out around 20,000 rpm. Something wrong here. I have 2 of these motors, so I'll run the 2nd motor this weekend. I have measured the rpm output of that motor using an off the shelf tachometer and can confirm the dynamometer's results.

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