Quadcopter V4

This is the 4th revision quadcopter I've designed - versions 2 and 3 are not worthy to be uploaded. (If you must know, version 2 was to be just version 1 with metal arms instead of 3d printed, and version 3 was a complete sheet metal based quadcopter)

This quadcopter has metal arms (for strength), but 3d printed Motor mounts, propeller cages, battery and camera mount, and landing gear. The landing gear is spring loaded for softer landings. The propeller cage is not mount for crash protection,