VR Stuttering with some FC aircraft

[=IRFC=NakedSquirrel]

I'm getting odd 'stuttering' with some FC aircraft after I turn on the engine.  Specifically the Sopwith Dolphin, Pfalz DIII, and Dr.1.  I have FPS monitoring on, and I'm not getting a framerate drop, but the game becomes much more choppy and less smooth.  I think it has something to do with the propeller on these aircraft.

[-DED-Rapidus]

@NakedSquirrel, thank you I'll check it out.