Yakolev Yak 52's, North American Harvard's and Trojan are common sights are airshows around the country. The New Plymouth-based Yakrobats and the Roaring 40's Harvard teams always put on a good display [even if I am a bit over the noise of the Harvards!].
The Trojan, ZK-JGS, is one of my favourite warbird aircraft - a large aircraft, tricycle under-carriage and an awesome sound. It really "looks the business" :-)
First two pictures are of the Yaks, next the Harvards and finally the Trojan.