Can I fly with one dead motor?
Can I fly my quadcopter with one propeller or motor loss?
Usually the answer is No!
For redundancy you will need at least a hexacopter but, the best for motor or prop failsafe operations are the octacopters.
In the YouTube video below you can see what happens if you lose one propeller of your quadcopter.
https://www.youtube.com/watch?v=bsHryqnvyYA
Thanks for the new quadrocopter failsafe algorithm, the aircraft can recovery after propeller or...