Many of the needles on the instrument panels are all over the place. RPM, manifold. Most of the other warbirds (like the P-47, Spit and P-51)have steady needles, allowing you to set RPM and manifold to a set value. F4U? Sure, there is a bit of vibration, but this feels like a prop blade has a foot missing or the engine is missing a few cylinders. Well you'll just have to guess. I doubt very much it was this bad in real life.