German penetration table for the commonplace 7,92mm SmK v round, at different ranges and angles, striking the armor plate directly (cont. lines) or indirectly (hitting a 3mm thick dural plate at 20 degrees 1,5 meters before the the armor plate).
For reference, the armor thickness on the Spitfire noted. I believe the Hurricane had the same thicknesses.
Apparanatly a lot was dependent on wheter the bullet hit anything before it struck armor plate. If not, it could go through it rather easily. I am not sure if the Spit had 3 mm thick dural plating on the fuselage (it seems unlikely to me, given that the 'deflector plate' cowling over the tank was only 3.5mm thick and it was considered to be a reinforced part to deflect bullets) but 20 degrees angle of impact and 1.5 meters of spacing does seem practical.
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