Interesting design but I would question the use of dyno with regards to an accelerometer. Since this only can measure the spin up characteristics of a fixed weight with zero load being applied to the motor being tested. How is this a dynamometer? Back in the days of brushed motors many companies tried to sell accelerometers as dyno's but there was only one true mfg of a dyno, Competition Electronics Turbo Dyno. Just curious if I missed something in the videos that shows how there is a load being applied beyond the weight of the metal disc?