void turnLeft(double speedPct)
Rotates the chassis left (counter-clockwise) at the given speed
Parameters
speedPct - The speed to turn at in pct units
Example
Chassis chassis (left, right, positioner, 11, 3.0/2.0, 3.25/2.0, ratio18_1);
//Turn left at 50% speed
chassis.turnLeft(50);