How much do propellers stutter? A photo in EAA's monthly magazine shows one propeller blade as a dozen distinct images rather than the usual smooth motion blur.  One explanation (this answer appears to have been deleted) for this is that a propeller at nominally 2300 rpm actually varies +-200 rpm as each cylinder fires, so when it's slower, it captures more sunlight glint.
Edit: this question is about propellers, not about a photo.  The photo is only a motivation, perhaps an incorrect one, for the question.
Is this plausible?

Piston engines have flywheels.
A 400 rpm change happening 2300 times per minute is a 17% change happening 38 times per second.  Jerry Lee Lewis would say that's a whole lotta shakin' goin' on.
Onboard GoPro videos with rolling shutter artifacts show the blades &quot;bending&quot; from root to tip smoothly, not jaggedly.
We can count more than 15 blade-images in that short arc of revolution of the propeller, so there's no way that each one corresponds to an individual firing of a cylinder.  Perhaps there is a resonant vibration involving a slight twisting of the blade, and the sun angle is such that this produces a strobing effect.
The suggestion of a 300 rpm variation between each individual firing of a piston is completely implausible.
Some sort of camera artifact seems a possibility.