You can use the motor to rotate the top and back rotors and you can adjust them anytime according to the speed or the power of the helicopter.
(I’ve manually connected all the parts of the rotor with WeldConstraint and unanchored them, and then used HingeConstraint to connect the part to the rotor as shown in the video)
The values that I’ve used might not be correct, you can change them to whatever fits your scenario!
If you are not familiar with HingeConstraint and Motor, watch this: