The Yak 52 is a 2 seat tandem aircraft with fully inverted flight and aerobatic capabilities to +7gs - 5gs with two pilots and full main tanks of fuel.
Registration in the USA is required to be in the "Experimental" category. It is powered by a 360 HP M-14 radial engine.
The Nanchang CJ-6 is powered by a 285 hp Housai 9 cyl radial and is capable of +6 - 3 Gg's. It's a cleaner aircraft than its Russian counterpart and has a higher top speed.
Both aircraft are still being produced today and have become popular with pilots worldwide who appreciate the sturdy qualities, reliability and personality of these old warbirds.