Roll vibration dampening platform. Mostly to correct the roll vibration distorting the video image around the outside of the image and secondly to add to the vibration dampening on the IMU gyro's/accelerometers. APM case has extra rubber grommets at the four attaching points as well as a gel like foam inside the case surrounding the boards. Centre hub redesigned to allow quick release of the arms in a crash. This frees the arms to pivot rather than snap.
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I am a big fan of refactoring a design based on lessons learned