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I realize I've got a cheapo machine but money's tight at the moment and I'd like to learn how to fly on something cheap. I've got a Fayee FY801 that always had a lazy motor (back right). Now it is not turning at all when the propeller is on. If I pull off the prop the spindle feels like it's...

If I want to mount a bulbous object on the top of the quad how would I calculate the amount of space I need to keep it flying? Is there dead space on the centre top side between all the blades ? Should I just assume the entire column directly above the quadcopter is "in use"? Thanks