A couple more pictures of the P-51B's vulnerabilities.
#1: P-51B after getting zapped by the nose gunner of an Ace AI Wellington III at about 200 m range while closing at about 550 kph, so perhaps about 750-800 kph total closing speed. Normally, I'd call this a fair hit - lots of extra energy, close range and I wasn't maneuvering much - except that you'll notice that none of the bullets' trajectories actually directly penetrates the engine block or the cooling system! (The bullet at the top was also glancing.)
Even with a soft aluminum engine block and lots of extra energy on the bullet, there's a good chance that realistically all of those bullets would have ricocheted rather than penetrating.
And, ONE glancing shot was sufficient to instantly seize up the engine. No warning, just a dead engine. Not realistic behavior even for a mortally wounded engine.
http://forum.1cpublishing.eu/attachm...1&d=1401800105
#2 P-51B after getting hit by the tail gunner of an Ace AI Wellington III at 450 m. This one caused a coolant leak, so perhaps 5-10 minutes of engine life.
In addition to a remarkably tight bullet grouping by the quad machine guns (almost no dispersal at all - the bullet in the wing is from the head on pass I took earlier) at extreme range, you'll also notice that the bullet that inflicted the fatal damage penetrates exactly where the P-51 had 1/4" of armor plate! So, either an AP bullet or the armor plate over the coolant tank isn't properly modeled.
http://forum.1cpublishing.eu/attachm...1&d=1401800123