"Usually the problem is pretty simple Abbas. Have a read through the items above. Check out the reply directly above yours, and the others. If nothing stands out, start again  from scratch, remove props, disconnect motor wires, remove your…"

"Personally I can't remember how I fixed mine, It was probably something stupid like a reversed motor. but I would suggest double checking prop rotation and correct prop. Also, check all connections and security of all parts and wires, especially the…"

"Hi Henri,
"How do you protect your barometric chip from light?"
I've seen lots of references like this and being intrigued/concerned, I have scoured the data sheets. I have not found any mention of light being a factor in measurement. What will make…"

"I also have a flipping copter ;)
I have just changed FC from a KK5.5 to a  Arducopter 2.5 (AP2 latest download) - both in X mode, using 'simple' control - everything on the airframe WAS fine before.
The effect is that it trys to flip port to…"