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I don't have one, but inspect the shaft, it looks like there is a key on the shaft, then inspect the inside of the blade where it goes on top of the shaft, see if it looks like the shaft has spun out the blade and this is why it's not spinning.
Remove the blade and the container, then turn on and see if the shaft is spinning, it should be most are a direct drive.
So now if the shaft is spinning, that most likely means that the blade hole is broke where it sets on top of the shaft.
Look closely at the inside of the blade, you should see some type of damage like the groves are worn, I hate to see you buy one and it was the shaft that wore, but usually the blade will go first.
well firstly you still have warranty on it, get them to replace it..
the blades are controlled by a motor and a gear system in the helicopter itself. The gear is broken or the motor is wedged in by the gear. or simply burnt out, You will need to open it to unwedge the gear and if it spins when you turn the gear, you need to replace the motor. Both blades use separate motors that's what allows it to trim (turn) when one set spins faster than the other, It goes straight when both blades spin at the same speed.
On top of the head there is a button to press to lock the blade arbor. Press it down and turn the blade by hand until it locks in place. Then you need either a spanner wrench or nut wrench depending on which arbor nut you have. Grinders usually come with whichever wrench they need. Most grinders have an arbor nut with two or four holes and require a spanner wrench with two studs that fit into two of the holes to remove the arbor nut. Some have an arbor nut with a hex fitting, like a regular nut & bot setup, that the arbor wrench fits on. If you don't have the proper wrench sometimes you can get the arbor nut off with a pair of vice grips or pliers. You will want to turn the nut in the same direction as the blade spins when the grinder is on to remove it. When you put the new blade on, get the arbor nut hand tight, it is self tightening and will get tighter as you use the grinder.
I was flying my syma s800g and hit the ceiling fan chain. When I attempted to fly it would spin and fall over. The problem was I broke the two small plastic pins on the top rotor holder. Ordered a new top rotor and flies fine. Then on my s107 I flew into a door and the top rotor had zero spin although the motors worked. In that case the screw that sets the top rotor onto the middle shaft loosened resulting in no lift and also tilted and fell over. This was fixed by securing the set screw properly. So in both instances it was similar effects due to the top rotors not spinning in sync with lower blades.