I made about 4-5 high-speed passes on a low-speed Hurri 2C in an F4U a couple weeks ago (last time on Equinox, I think). Pinged the HELL out of him on every pass. Wings, fuselage, tail, etc. Didn't go down. Then he got help from his Yak-hole buddy who took out some of my control surfaces, and I spun in trying to run out on the deck (I'll fight the Yak alone, but not with that Hurri hanging around).
I was having serious rubber bullets that day, but still, one would think that'd have been enough to drop him.