let speed = 100.0;

    let speed = 200.0;

    let turn_speed = 200.0;
    let brake_speed = 100.0;

    let turn_speed = 300.0;
    let brake_speed = 50.0;

    torque.apply_torque(key_multiplier * xform.forward() * dt * roll);

    torque.apply_torque(key_multiplier * 0.5 * xform.forward() * dt * roll);