Maiden flight flipped over

Today I flew my quad for the first time. It left the ground and within less then one second flipped over..

It seems as if one of my motors isn't running correctly. Each electric motor, as most people know, consists of a number of magnets that are energised in sequence in order to turn the propeller. However, if one or more of these magnets are faulty, the propeller will not turn as intended. This is something that the motor early on indicated as the propeller seemed as if it didn't start up as early as with the other motors. I choose to ignore that and drove up the throttle, which then made the propeller turn and accelerate as the others. This then made the quad to flip over each time I tried to fly.

As this blog states, I tried to keep my budget low and to buy cheap parts. The motors I'm using are branded Turnigy. That brand is a cheap Chinese pirated copy of another brand, which also makes it less reliable. I was then also early on recommended to buy a few extra motors while ordering to be able to coupe with one of them to be broken on delivery. That I never did. So, today, I've ordered two extra motors plus two ESC's as I actually don't know if they may be faulty as well.

Another thing, I tried to mount the prop savers to the engines today to be able to save the propellers if I'd crash only to figure out that I'd ordered prop savers with the wrong dimension of the propeller shaft. Ordered 4mm prop savers now also instead of the old 3mm.