Twisting the arms of your boomerang, either clockwise or counter-clockwise, alters the angle of attack, which is the angle at which the leading-edge cuts through the oncoming air-flow. Twisting the arm counter-clockwise will add positive angle of attack to the wing, whereas twisting clockwise adds negative angle of attack. Tuning your boomerang by twisting is used to adjust: spin-rate and wind stability, distance, lie-down, and the type of trajectory.
Twisting counter-clockwise (adding positive angle of attack) will reduce the rate at which the boomerang spins, making it more stable in the wind. Twisting counter-clockwise will also reduce or eliminate lie-down, greatly reducing the distance of the flight. In general, adding positive angle of attack (counter-clockwise) will create a lower, circular flight pattern. Adding negative angle of attack (twisting clockwise) will create an eliptical flight path, often with steeper ascents. As with bending, twisting your rang in either direction requires adjustments in how you throw your boomerang. After twisting counter-clockwise, it is recommended that the thrower throw the boomerang a little lower, with more tilt (flatter) and more into the wind. If you twist clockwise you should throw more vertically and less into the wind.
