Primarily two items:
- Beefed up the Hub slightly to allow for less flex
- Added location rods to the end motor mounts to ensure positive lock. I had super glued the motor mounts to the arms however with the vibration they could come loose and cause havoc to the copters flying characteristics :(.
Hub Changes:Old/New (Orange)
Running FEM analysis suggested a 20% increase in strength just by increasing the filet radius.