“Tumbling Goose,” Race Number 84, is an L-39C built in November of 1984 and delivered to the Soviet Air Force in December of that year. It last flew as a military trainer on August 18th, 1999, serving the Ukrainian Air Force, and was exported to private ownership in the United States in the 2000s. It then underwent a comprehensive overhaul that included making considerable weigh saving modifications and the installation of state-of-the-art avionics. It made its debut as a civilian warbird in July of 2010 and first flew at Reno in 2019, qualifying at 10th place with an average speed of 437.277 miles per hour. In Heat 2C that year, Tumbling Goose finished in 2nd place, clocking a speed of 414.809 mph. The aircraft, painted a blazing color scheme of bright yellow and black, finished 1st in the 2021 Jet Bronze race with an average speed of 428.022 miles per hour.