A little-known fact about the Real Life Mark I & II Spitfires of 1940 Battle of Britain fame is that the pilots could slide the canopy back at any speed to listen for enemy a/c sneaking up from behind. The 109's couldn't do this because of their inferior side-opening canopy design. The Cliffs of Dover sim models this perfectly. I can't put my hands on any documentation of this, but I read it on the Internet, so it must be true.
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