[Tooslow]

In Robert Johsons book "Thunderbolt" he said he flew the Spit V. He was surprised that it's engine died when he went inverted. He noted that that the Spit IX did not have that problem. That was at least late 1942 or early 1943 so the problem apparently still existed at that time.

Also the new Spit XII by MrJolly sputters under negative g.