Thanks. I just looked at the yuneec web site. They say the Typhoon H can lose two and still fly with the remaining four. Not that I would want to test it after laying out the funds for one but it certainly gives a little comfort space.I don't think that is being said, hex-copter can provide motor redundancy for a single motor failure.
Quadcopters, Hexacopters and Octocopters: What Are the Differences? – The Drone Files