Contra Rotating Brushless Outrunner motors

Contra rotating motors are nothing new. They are essentially two motors that are connected through a bracket ass to ass style and share a common shaft. The two motors still need separate ESCs. With the X6 and X8 modes it is possible to put this type of motor on the same side of the UAV instead of having one on top and one on the bottom. It might be something to look into with a future design.