On Saturday Gavin Wills in his Piper Cub ZK-BFV put on a very fine demonstration of this art.
It is thought to be the first public demonstration of this in NZ. It took place at the Wings Over Water Airshow at Lake Ruataniwha (Twizel) on Saturday the 22nd.
Below is a short video clip of one of his several runs.
Very nicely done Gavin.