Niel Williams did the test flight in a Yak 11 back in the 70s.
That would have been a standard Yak-11 with a 31' wingspan and a 700 HP
Shvetsov Ash-21 seven-cylinder single-row radial weighing 1100 pounds.
Czech Matę had clipped wings (?) and a 2800 HP PW R2800 eighteen-cylinder two-row radial weighing 2400 pounds.