VH-WOQ Pitts Model 12 Macho Stinker (MSN 343) owned by Rodney Edwards, and VH-YGJ Yakovlev Yak-52 'Yakka' (tailwheel conversion) (MSN 822802), named 'Hard Yakka', owned by Gordon Johanson, at Sport Aircraft Builders Club (SABC) Annual Fly-In, Serpentine Airfield - 27 October 2019. VH-YGJ: A tailwheel conversion of a Yak-52, formerly operated by DOSAAF, a Soviet paramilitary organisation which trained pilots. Built in 1982, ex DOSAAF-134, N25239. VH-WOQ: The Macho Stinker was designed by Curtis Pitts during 1993-1995, and he released the design on his 80th birthday in December 1995. It is a high-performance aerobatic biplane with a Russian Vedeneyev M14P/PF radial engine. It can be built from plans, kits, or can be factory-built. It uses fabric-covered, welded steel tubing for the fuselage, and fabric-covered wings and wood spars. Photo © David Eyre.