A team from Arizona led by mechanic and restorer Dall Koller and aerobatic flight champion Jeff Buerbon built two Yak-55M as Siamese twins.

 

 

As well as two M-14P engines of 360 hp, a TRD GE J-85 (in the variant GE CJ610) was installed.

For the first time it took to the air in June 2018, still without a jet, and flew normally. By October it flew with three engines. It flew and flew well.