Quote:
Originally Posted by Cataplasma
Plexiglass (PMMA=Polymethylmethacrylate) was invented by army and used for the first time for spit's cockpit (with its typical thermoformed rounded shape).
The scratches that you see in Lock on are typical of modern PMMA cockpits.
Alcohol is very aggressive for PMMA, if you want to make some scratches on PMMA you just have to clean it.
Glass scratches are different and very rare to see on old glass cockpit's thikness.
The spit is the only plane that should have this "scratches", and also different clean-cut bullet's holes
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The 109 canopy is also plexiglass. There's even a section in the real Messerschmitt Emil manual about how to clean it without scratching it.
Glass was only used in the windscreen as armoured glass and that was introduced later on around the time of the F model and retrofitted to older E models.