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Since the accelerometer was placed on top of the dart holder, it record records the acceleration o of the xyz axis as it is returning and launching.
In its re-laod load position the accelerometer Z values read between 0.3 and 0.6, the Z values read between 0.6 and 1.0, and the x-readings were out of plane motion. So when the sensor reads the position, the motor will stop for 3 6 seconds, then a signal for full speed is sent. Then it goes back to its feedback loop. 
Feedback loop
The feedback loop consisted in keeping the motor at full speed. When the mechanism engages in release, the motor has to lift the weight of the mechanism as it rotates the link. In an open loop, the motor would stop when trying to move up since. Also when run in open loop, the motor would seem to do a quick return because of the effects of weight on the input link. With the close-loop, the effects of gravity were combated to keep a consistent speed.