The Helicopter, also known as the Chopper, Inverted V is an advanced pole dance trick that requires a great amount of core and back strength. You should have a strong basic invert before learning this trick and develop your core strength with these exercises.
This video clip demonstrates a move that is similar to the Helicopter except that it is not a spin, it is a move that precludes it and can help to develop the core strength and basic movement to get into the Chopper spin:
This video clip demonstrates the Helicopter spin. You will move your leg out laterally to gain the momentum needed to spin instead of just going upside down with your legs out in a 'V':
Tips when learning this move: