We did quite a lot of research and evaluation, Pier Giorgio went especially deep into that. But in the end we wanted a very simple system anyway. So after judging caliber, bullet weight, muzzle speed, rate of fire and several other technicalities for the main weapons of world war two airplanes,
in the end we saw that a good model could be to evaluate heavy machineguns (12,7 mm or 0,50") as equivalent to two light machineguns (7.7 mm or 0,303") or to half of a 20 mm cannon. We started with these guns, knowing that we could deal on a similar basis for future and more powerful weapons.
In the end, we made an A "deck" where a single card/chit accounts for 2 light machineguns or 1 heavy one. The B deck is just a more powerful version where a single chit accounts for two heavy machineguns, or 4 light ones, giving double the damages as A. The C is equivalent to B in average damages, but being meant for 20 mm cannons it has a more hit-or-miss distribution of damages. You hit less frequently, but when you do, you deal more damage. The D has a similar distribution but with more damage, and it is for 37 mm cannons and equivalents.
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