Nice shot - I didn't even know there were any Yaks left in flying condition...
There's something about the sound of a Pratt&Whitney radial or a Rolls-Royce Merlin at full throttle that just reaches down into your soul and shakes loose a sense of "Damn I want to be the guy up there!"
Merlin's made a mighty fine powerplant for the unlimited hydroplanes too. A pity they all use jet turbine engines nowadays

I loved the sound of screaming boats washing over Lake Washington in Seattle's Seafair races... Just not the same anymore.
Jim