Weird question

[ReV:-O]

Hey guys,

I noticed something weird today. I'd finished running my brushless Hyper 8 for the day and took it home, unplugged the lipos etc and prepared to inspect it before put it away. I noticed as i turned the front wheels by hand from side to side, the red light on my DX3R receiver flashed, and the red light on my MMM flashed. They flashed every time I turned the wheels, which in turn was turning the servo. Does the servo somehow send a small current to the receiver and ESC?

As I said, weird question