* https://youtu.be/gRSPFYlKo58 How to build Retracts for Quadcopters/multirotors
* Focus your camera using a pattern, http://www.rcgroups.com/forums/showthread.php?t=2516950
* How to store your lipo https://www.tested.com/art/makers/824939-how-safely-organize-your-lipo-battery-storage/
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