Assuming the battery is fully charged, the shaft could be dry, purchase a WD-40 pen, they have a magic marker type tip that dispenses controlled amounts of lube by pressing the tip on a surface to get a drop then use a toothpick to put a small amount on the rotor shaft top and bottom. I did that to mine and the shaft spins a lot smoother. Mine always lifted off with no problem, but it got the gitters and and would drop a few feet now and then. after I oiled the shaft the gitters went away. Give it a try. John.
SOURCE: syma s107 take off problem
The blades could be on up-side-down or The battery may not be holding enough of a charge anymore. If it's the battery, check out these Syma S107 Battery replacement instructions.
SOURCE: my Syma S107 will not lift off the ground. what
Had the same problem - the rotors would spin but the helicopter would not take off. Finally tried tightening both screws on the piece just below the Balance bar. I tightened one of the screws about 1/8 turn, and now it works great.
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