outside.setSpeed(_motorSpeed);
float steerRatio = 1 - rate / 100.0f;
inside.setSpeed((int) (_motorSpeed * steerRatio));
if (angle == Float.POSITIVE_INFINITY) // no limit angle for turn
{
if (_parity == 1) outside.forward();
else outside.backward();
if (_parity * steerRatio > 0)
{
inside.forward();