The first check of the M150 prototype 3 in the underground parking lot:
The problem is that the clearance between the floor and the ceiling is 2m only.
Thus, I try to keep the copter low, at all costs. Rather to bounce a few times than to hit something higher and crash.
To have it a bit harder, there is a countdown of about approx. 3 minutes,
after which the lights go out and then there is quite dark down there.
I would avoid hitting the wall with my other micro where there is an 0.008 lux CCD camera mounted,
but the 808 CMOS keychain cam on this can not see that well in dim light conditions.
Anyway, the quad is fine, I just straighten the antenna back and it flew again.