These low cost RC planes often have minor defects out of the box. One common problem is that they cannot fly a straight line because the motor on one side spins faster than the other, which will give you a hard time flying a straight line or making turns on one side. As a quick workaround you can give the weaker motor a slightly larger prop. Say if the plane tends to have a left bias, that means the left motor is weaker than the right one. You should either give the right motor a smaller prop, or use a larger prop on the left motor. This should easily solve the problem.
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