Well if they use the real life limit load factors then it would be pretty bad for Spitfire pilots as the limit load factor for the Spitfire was some 5.33 G's compared to the std. German 8 G's and US 7.33 G's.
But then again, most pilots back then blacked out at around 4 G, so anything above 5 G is gonna entail flying in the blind anyway
